DOCSLIB.ORG

Íîâûå Ìèíåðàëû

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Íîâûå Ìèíåðàëû 2007 ÇÀÏÈÑÊÈ ÐÎÑÑÈÉÑÊÎÃÎ ÌÈÍÅÐÀËÎÃÈ×ÅÑÊÎÃÎ ÎÁÙÅÑÒÂÀ ×. CXXXVI, ¹ 4 2007 ZAPISKI RMO (PROCEEDINGS OFTHE RUSSIAN MINERALOGICAL SOCIETY) Pt CXXXVI, N 4 ÍÎÂÛÅ ÌÈÍÅÐÀËÛ ÓÄÊ 549.6 © Ïî÷åòíûé ÷ë. À. Ï. ÕÎÌßÊÎÂ,* ä. ÷ë. Ã. Í. ÍÅ×ÅËÞÑÒÎÂ,** ä. ÷ë. Ð. Ê. ÐÀÑÖÂÅÒÀÅÂÀ*** ÄÓÀËÈÒ Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9 — ÍÎÂÛÉ ÖÈÐÊÎÍÎ-ÒÈÒÀÍÎÑÈËÈÊÀÒ Ñ ÌÎÄÓËßÐÍÎÉ ÝÂÄÈÀËÈÒÎÏÎÄÎÁÍÎÉ ÑÒÐÓÊÒÓÐÎÉ ÈÇ ËÎÂÎÇÅÐÑÊÎÃÎ ÙÅËÎ×ÍÎÃÎ ÌÀÑÑÈÂÀ, ÊÎËÜÑÊÈÉ ÏÎËÓÎÑÒÐÎÂ, ÐÎÑÑÈß1 A. P. KHOMYAKOV, G. N. NECHELYUSTOV, R. K. RASTSVETAEVA. DUALITE, Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9, A NEW ZIRCONO-TITANOSILICATE WITH A MODULAR EUDIALYTE-LIKE STRUCTURE FROM LOVOZERO ALKALINE MASSIF, KOLA PENINSULA, RUSSIA * Èíñòèòóò ìèíåðàëîãèè, ãåîõèìèè è êðèñòàëëîõèìèè ðåäêèõ ýëåìåíòîâ, 121357, Ìîñêâà, óë. Âåðåñàåâà, 15; e-mail: [email protected] ** Âñåðîññèéñêèé íàó÷íî-èññëåäîâàòåëüñêèé èíñòèòóò ìèíåðàëüíîãî ñûðüÿ, 109017, Ìîñêâà, Ñòàðîìîíåòíûé ïåð., 31 *** Èíñòèòóò êðèñòàëëîãðàôèè ÐÀÍ, 117333, Ìîñêâà, Ëåíèíñêèé ïð., 59 Dualite was found on Mt. Alluaiv (Lovozero massif, Kola Peninsula), in hyperagpaitic pegmatoid rock as rare anhedral grains up to 0.3—0.5 mm across. Associated minerals are: sodium-potassium feldspar, nepheline, sodali- te, cancrinite, aegirine, alkaline amphibole, eudialyte, lovozerite, lomonosovite, vuonnemite, lamprophyllite, spha- lerite and villiaumite. It is yellow, transparent or translucent, with conchoidal fracture; brittle; luster vitreous; streak white. Mohs’ hardness 5. D(meas.) = 2.84(3) g/cm3 (volumetric method), D(calc.) = 2.814 g/cm3. The mineral dis- solves and gelatinises in acid at room temperature. Non-fluorescent. Optically uniaxial, positive, no = 1.610(1), 3 ne = 1.613(1). Trigonal, space group R3m, a = 14.153(9), c = 60.72(5) Å, V = 10533(22) Å , Z = 3. The strongest lines of the powder diffraction pattern [d, Å(I)(hkl)] are: 7.11(40)(110), 4.31(50)(0.2.10), 2.964(100)(1.3.10), 2.839(90)(048), 2.159(60)(2.4.10, 0.4.20), 1.770(60)(2.4.22, 4.0.28, 440), 1.362(50) (5.5.12, 3.0.42). Chemical composition (wt. %, electron probe, H2O content from crystal structure analysis): Na2O 17.74, K2O 0.08, CaO 8.03, SrO 1.37, BaO 0.29, MnO 2.58, FeO 1.04, La2O3 0.79, Ce2O3 1.84, Nd2O3 0.88, Al2O3 0.20, SiO2 51.26, TiO2 4.40, ZrO2 5.39, Nb2O5 1.94, Cl 0.58, H2O 1.39, –O = Cl2 0.13, ñóììà 99.67. Empirical formula (based on Ócations = = 106 apfu as determined by crystal structure analysis) is (Na29.79Ba0.1K0.10)Ó30 (Ca8.55Na1.39REE1.27Sr0.79)Ó12$ 2+ $ (Na3.01 Mn1.35 Fe087. Ti 077. )S6 (Zr2.61Nb0.39)Ó3 (Ti2.52Nb0.48)S3 (Mn0.82Si0.18)S1 (Si50.77Al0.23)Ó51 O144[(OH)6.54(H2O)1.34 Cl0.98]Ó8.86. Simplified formula: Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3 MnSi51O144(OH,H2O,Cl)9. The name dualite is derived from the Latin «dualis» [dual] in allusion to the dual taxonomic membership of the mineral, which is at once a zirconosilicate and titanosilicate. The crystal structure is characterized by the presence of two types of modules (alluivite-like and eudialyte-like) alternating along the triad axis, causing dualite to have a double c period relative to eudialyte and a close crystal chemical relationship to rastsvetaevite (ZRMO, 2006, N 1) and labyrynthite (ZRMO, 2006, N 2). According to the authors’ crystal chemical systematics of the eudialyte group, the mineral be- longs to one of its three principal subgroups characterized by a 24-layered structural array. Dualite is a late-pegmati- tic mineral formed during the final stages of hyperagpaitic pegmatite formation. Type material is deposited at the Fersman Mineralogical Museum, Moscow. Êàê èçâåñòíî, íåñìîòðÿ íà áîëüøóþ áëèçîñòü èîííûõ ðàäèóñîâ è õèìè÷åñêèõ ñâîéñòâ òèòàíà è öèðêîíèÿ, ýòèì ýëåìåíòàì ïðèñóùè ãëóáîêèå ðàçëè÷èÿ êðèñòàëëî- õèìè÷åñêèõ ôóíêöèé, îñîáåííî ðåçêî ïðîÿâëÿþùèåñÿ â ñòðåìëåíèè Ti-îêòàýäðîâ ê 1 Ìèíåðàë è åãî íàçâàíèå óòâåðæäåíû ÊÍÌÍÌ ÌÌÀ 8 èþëÿ 2005 ã. 31.
Load more

Recommended publications
  • Mineral of the Month Club January 2016
    Mineral of the Month Club January 2016 HALITE This month our featured mineral is halite, or common salt, from Searles Lake, California. Our write-up explains halite’s mineralogy and many uses, and how its high solubility accounts for its occurrence as an evaporite mineral and its distinctive taste. In the special section of our write-up we visit a European salt mine that is a world-class cultural and heritage site. OVERVIEW PHYSICAL PROPERTIES Chemistry: NaCl Sodium Chloride, often containing some potassium Class: Halides Group: Halite Crystal System: Isometric (Cubic) Crystal Habits: Cubic, rarely octahedral; usually occurs as masses of interlocking cubic crystals with corners sometimes truncated into small, octahedral faces; skeletal forms and receded hopper-type faces are common. Also occurs in massive, fibrous, granular, compact, stalactitic, and incrustation forms. Color: Most often light gray, colorless or white; also pale shades of yellow, red, pink, blue, and purple; blue and purple hues are sometimes intense. Luster: Vitreous Transparency: Transparent to translucent Streak: White Cleavage: Perfect in three directions Fracture/Tenacity: Conchoidal; brittle. Hardness: 2.0 Specific Gravity: 2.17 Luminescence: Often fluorescent Refractive Index: 1.544 Distinctive Features and Tests: Best field indicators are distinctive “table-salt” taste, cubic crystal form, perfect three-dimensional cleavage, and occurrence in evaporite- type deposits. Halite can be confused with sylvite [potassium chloride, KCl], which is similar in crystal form, but has a more astringent taste. Dana Classification Number: 9.1.1.1 NAME: The word “halite,” pronounced HAY-lite (rhymes with “daylight”), is derived from the Greek hals, meaning “salt,” and “lithos,” or stone.
    [Show full text]
  • Petrology of Nepheline Syenite Pegmatites in the Oslo Rift, Norway: Zr and Ti Mineral Assemblages in Miaskitic and Agpaitic Pegmatites in the Larvik Plutonic Complex
    MINERALOGIA, 44, No 3-4: 61-98, (2013) DOI: 10.2478/mipo-2013-0007 www.Mineralogia.pl MINERALOGICAL SOCIETY OF POLAND POLSKIE TOWARZYSTWO MINERALOGICZNE __________________________________________________________________________________________________________________________ Original paper Petrology of nepheline syenite pegmatites in the Oslo Rift, Norway: Zr and Ti mineral assemblages in miaskitic and agpaitic pegmatites in the Larvik Plutonic Complex Tom ANDERSEN1*, Muriel ERAMBERT1, Alf Olav LARSEN2, Rune S. SELBEKK3 1 Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo Norway; e-mail: [email protected] 2 Statoil ASA, Hydroveien 67, N-3908 Porsgrunn, Norway 3 Natural History Museum, University of Oslo, Sars gate 1, N-0562 Oslo, Norway * Corresponding author Received: December, 2010 Received in revised form: May 15, 2012 Accepted: June 1, 2012 Available online: November 5, 2012 Abstract. Agpaitic nepheline syenites have complex, Na-Ca-Zr-Ti minerals as the main hosts for zirconium and titanium, rather than zircon and titanite, which are characteristic for miaskitic rocks. The transition from a miaskitic to an agpaitic crystallization regime in silica-undersaturated magma has traditionally been related to increasing peralkalinity of the magma, but halogen and water contents are also important parameters. The Larvik Plutonic Complex (LPC) in the Permian Oslo Rift, Norway consists of intrusions of hypersolvus monzonite (larvikite), nepheline monzonite (lardalite) and nepheline syenite. Pegmatites ranging in composition from miaskitic syenite with or without nepheline to mildly agpaitic nepheline syenite are the latest products of magmatic differentiation in the complex. The pegmatites can be grouped in (at least) four distinct suites from their magmatic Ti and Zr silicate mineral assemblages.
    [Show full text]
  • Chemical Composition and Petrogenetic Implications of Eudialyte-Group Mineral in the Peralkaline Lovozero Complex, Kola Peninsula, Russia
    minerals Article Chemical Composition and Petrogenetic Implications of Eudialyte-Group Mineral in the Peralkaline Lovozero Complex, Kola Peninsula, Russia Lia Kogarko 1,* and Troels F. D. Nielsen 2 1 Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia 2 Geological Survey of Denmark and Greenland, 1350 Copenhagen, Denmark; [email protected] * Correspondence: [email protected] Received: 23 September 2020; Accepted: 16 November 2020; Published: 20 November 2020 Abstract: Lovozero complex, the world’s largest layered peralkaline intrusive complex hosts gigantic deposits of Zr-, Hf-, Nb-, LREE-, and HREE-rich Eudialyte Group of Mineral (EGM). The petrographic relations of EGM change with time and advancing crystallization up from Phase II (differentiated complex) to Phase III (eudialyte complex). EGM is anhedral interstitial in all of Phase II which indicates that EGM nucleated late relative to the main rock-forming and liquidus minerals of Phase II. Saturation in remaining bulk melt with components needed for nucleation of EGM was reached after the crystallization about 85 vol. % of the intrusion. Early euhedral and idiomorphic EGM of Phase III crystalized in a large convective volume of melt together with other liquidus minerals and was affected by layering processes and formation of EGM ore. Consequently, a prerequisite for the formation of the ore deposit is saturation of the alkaline bulk magma with EGM. It follows that the potential for EGM ores in Lovozero is restricted to the parts of the complex that hosts cumulus EGM. Phase II with only anhedral and interstitial EGM is not promising for this type of ore.
    [Show full text]
  • The Emplacement and Crystallization of the U–Th–REE-Rich Agpaitic and Hyperagpaitic Lujavrites at Kvanefjeld, Ilímaussaq Al
    The emplacement and crystallization of the U–Th–REE- rich agpaitic and hyperagpaitic lujavrites at Kvanefjeld, Ilímaussaq alkaline complex, South Greenland* HENNING SØRENSEN, JOHN C. BAILEY & JOHN ROSE-HANSEN Sørensen, H., Bailey, J.C. & Rose-Hansen, J. 2011. The emplacement and crystallization of the U– Th–REE-rich agpaitic and hyperagpaitic lujavrites at Kvanefjeld, Ilímaussaq alkaline complex, South Greenland © 2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 69–92. ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin) https://doi.org/10.37570/bgsd-2011-59-08 The U–Th–REE deposit located at the Kvanefjeld plateau in the north-west corner of the Ilímaussaq alkaline complex, South Greenland, consists of lujavrites which are melanocratic agpaitic nepheline syenites. The fine-grained lujavrites of the Kvanefjeld plateau can be divided into a northern and a southern part with an intermediate zone between them. The northern part is situated along the north contact of the Ilímaussaq complex and continues east of the Kvanefjeld plateau as a lujavrite belt along the contact. This part has relatively ‘low’ contents of U, Th, and REE, and hyperagpaitic mineralogy is restricted to its highest-lying parts. The fine-grained lujavrites of the intermediate and southern part of the Kvanefjeld plateau occur between and below huge masses of country Received 14 September 2009 rocks which we show are practically in situ remnants of the roof of the lujavrite magma chamber. Accepted in revised form 1 September 2011 These lujavrites have high contents of U, Th, and REE, and hyperagpaitic varieties with naujakasite, Published online steenstrupine and villiaumite are widespread.
    [Show full text]
  • New Minerals Approved Bythe Ima Commission on New
    NEW MINERALS APPROVED BY THE IMA COMMISSION ON NEW MINERALS AND MINERAL NAMES ALLABOGDANITE, (Fe,Ni)l Allabogdanite, a mineral dimorphous with barringerite, was discovered in the Onello iron meteorite (Ni-rich ataxite) found in 1997 in the alluvium of the Bol'shoy Dolguchan River, a tributary of the Onello River, Aldan River basin, South Yakutia (Republic of Sakha- Yakutia), Russia. The mineral occurs as light straw-yellow, with strong metallic luster, lamellar crystals up to 0.0 I x 0.1 x 0.4 rnrn, typically twinned, in plessite. Associated minerals are nickel phosphide, schreibersite, awaruite and graphite (Britvin e.a., 2002b). Name: in honour of Alia Nikolaevna BOG DAN OVA (1947-2004), Russian crys- tallographer, for her contribution to the study of new minerals; Geological Institute of Kola Science Center of Russian Academy of Sciences, Apatity. fMA No.: 2000-038. TS: PU 1/18632. ALLOCHALCOSELITE, Cu+Cu~+PbOZ(Se03)P5 Allochalcoselite was found in the fumarole products of the Second cinder cone, Northern Breakthrought of the Tolbachik Main Fracture Eruption (1975-1976), Tolbachik Volcano, Kamchatka, Russia. It occurs as transparent dark brown pris- matic crystals up to 0.1 mm long. Associated minerals are cotunnite, sofiite, ilin- skite, georgbokiite and burn site (Vergasova e.a., 2005). Name: for the chemical composition: presence of selenium and different oxidation states of copper, from the Greek aA.Ao~(different) and xaAxo~ (copper). fMA No.: 2004-025. TS: no reliable information. ALSAKHAROVITE-Zn, NaSrKZn(Ti,Nb)JSi401ZJz(0,OH)4·7HzO photo 1 Labuntsovite group Alsakharovite-Zn was discovered in the Pegmatite #45, Lepkhe-Nel'm MI.
    [Show full text]
  • Mineralogicai, Radiographic and Uranium Leaching Studies on the Uranium Ore from Kvanefjeld, Ilimaussaq Complex, South Greenland
    T><2too/t6' Risø-R-416 Mineralogicai, Radiographic and Uranium Leaching Studies on the Uranium Ore from Kvanefjeld, Ilimaussaq Complex, South Greenland Milota Makovicky, Emil Makovicky, Bjarne Leth Nielsen, Svend Karup-Møller, and Emil Sørensen Risø National Laboratory, DK-4000 Roskilde, Denmark June 1980 RISØ-R-416 MINERALOGICAL, RADIOGRAPHIC AND URANIUM LEACHING STUDIES ON THE URANIUM ORE FROM KVANEFJELD, ILIMAUSSAQ. COMPLEX, 'SOUTH GREENLAND Milota Makovickyl , Emil Makovicky2, Bjarne Leth Nielsen-! , Sven Karuo-Møller^ and Emil Sørensen^ Abstract. 102 samples of low-grade uranium ore from 70 drill holes at Kvanefjeld, Ilimaussaq alkaline intrusion, South Green­ land were studied by means of autoradiography, fission-track investigations, microscopy, microprobe analyses and uranium- leaching experiments. The principal U-Th bearing mineral, steen- strupine, and several less common uranium minerals are dis­ seminated in lujavrite 'nepheline syenite) and altered volcanic rocks. Stenstrupine has a/erage composition Na6.7HxCai.n e Al (REE+Y)5.8(Th,l')o.5 ( ""1 . 6*" 1 . S^Q. 3^0. l 0. 2 ) Sii2036 (P4.3Si-) ,7 )024 (F,OH). nH20; n and x are variable. It either is of magmatic origin (type A) or connected with metasomatic processes (type B), or occurs in late veins (Type C). Preponder­ ance of grains are metamict (usually 2000-5000 ppm U3O8) or al­ tered (usually above 5000 ppm U3O8), sometimes zoned with both (continue on next page) June 1980 Pisø National Laboratory, DK-4000 Roskilde, Denmark components present. Occasionally they are extremely altered with U content falling to 500-5000 ppm U3O8 and local accumulations of high-U minerals formed.
    [Show full text]
  • Mangan-Neptunite Kna2li(Mn2+,Fe2+)
    2+ 2+ Mangan-neptunite KNa2Li(Mn ; Fe )2Ti2Si8O24 c 2001 Mineral Data Publishing, version 1.2 ° Crystal Data: Monoclinic. Point Group: 2=m or 2: Crystals prismatic, somewhat elongated along [001], to 7 cm, showing 110 , 001 , 100 , also 111 , 111 , rare 210 . Also as aggregates of small crystals, druses, rofsettges,fbloogmsf, andg earthfy crugstsf. Tgwinninfg: Ags contact twins on 001 . f g Physical Properties: Cleavage: Distinct in two directions, intersecting at 80 . » ± Fracture: Uneven to conchoidal. Tenacity: Brittle. Hardness = 5{6 D(meas.) = 3.17{3.20 D(calc.) = 3.26 Optical Properties: Transparent to translucent to opaque. Color: Dark cherry-red, orange, or black in small crystals; cherry-red in thin fragments; in thin section, light yellow, orange, or red-orange. Streak: Brick-red to reddish brown. Luster: Vitreous to resinous. Optical Class: Biaxial (+). Pleochroism: Distinct; X = light yellow; Y = orange or yellow-orange; Z = red-orange. Orientation: Y = b; Z c = 16 {20 . Dispersion: r < v; ^ ± ± very strong. Absorption: Z > Y > X. ® = 1.691{1.697 ¯ = 1.693{1.700 ° = 1.713{1.728 2V(meas.) = 31±{36± Cell Data: Space Group: C2=m or C2=c: a = 16.38 b = 12.48 c = 10.01 ¯ = 115±240 Z = 4 X-ray Powder Pattern: Lovozero massif, Russia. 2.485 (100), 1.506 (100), 1.483 (90), 2.170 (80), 1.924 (70), 2.841 (60), 2.948 (50) Chemistry: (1) (2) (3) (1) (2) (3) SiO2 52.65 52.68 52.98 CaO 0.37 0.43 TiO2 17.38 18.21 17.61 Li2O 1.08 1.65 Al2O3 0.99 Na2O 5.12 9.16 6.83 Fe2O3 1.07 K2O 6.30 4.94 5.19 + FeO 5.54 5.16 7.92 H2O 0.06 MnO 8.87 9.95 7.82 H2O¡ 0.10 MgO 0.15 0.12 Total 99.68 100.65 100.00 (1) Mt.
    [Show full text]
  • The Origin of Hydrocarbon Gases in the Lovozero Nepheline-Syenite Massif (Kola Peninsula, NW Russia), As Revealed from He and Ar Isotope Evidence
    minerals Article The Origin of Hydrocarbon Gases in the Lovozero Nepheline-Syenite Massif (Kola Peninsula, NW Russia), as Revealed from He and Ar Isotope Evidence Valentin Nivin Geological Institute, Kola Science Centre, Russian Academy of Sciences, 14 Fersman St., 184209 Apatity, Russia; [email protected]; Tel.: +7-815-55-79-580 Received: 15 August 2020; Accepted: 16 September 2020; Published: 21 September 2020 Abstract: The occurrence of hydrocarbon gases (HCG) in unusually high concentrations for magmatic complexes, in the Lovozero and some other alkaline massifs, is of both geochemical and practical interest. The nature of these gases, despite the long history of research, remains the subject of debate. As an approach to solving this problem, we studied the coupled distribution of occluded HCG and the recognized tracers of various geological processes, such as helium and argon isotopes. The extraction of the gas components trapped in fluid micro-inclusions was carried out by the mechanical crushing 3 4 of rock and mineral samples. A positive correlation was found between the He/ He and CH4/C2H6 ratios, whereas a negative correlation of the latter was found with the 36Ar concentration, which in turn was directly related, in varying degrees, to the content of HCG and most strongly with pentanes. Conjugacy of the processes of the heavier gaseous hydrocarbons, a loss of the deep component of the fluid phase and dilution of it with the atmogenic component was established. In the absence of a 3 3 correlation between CH4 and He, the value of the CH4/ He ratio in the Lovozero gas substantially exceeded the estimates of it in gases of a mantle origin, and mainly corresponded to the crustal values.
    [Show full text]
  • (F, Cl, Br, and I) and S Ratios in Rock-Forming Minerals As
    minerals Article Changes in Halogen (F, Cl, Br, and I) and S Ratios in Rock-Forming Minerals as Monitors for Magmatic Differentiation, Volatile-Loss, and Hydrothermal Overprint: The Case for Peralkaline Systems Hans G.M. Eggenkamp 1,* , Michael A.W. Marks 1, Petya Atanasova 1,2, Thomas Wenzel 1 and Gregor Markl 1 1 Department of Geosciences, Eberhard-Karls-Universität Tübingen, Schnarrenbergstraße 94-96, D-72076 Tübingen, Germany; [email protected] (M.A.W.M.); [email protected] (P.A.); [email protected] (T.W.); [email protected] (G.M.) 2 Helmholtz-Zentrum Dresden—Rossendorf, Helmholtz Institute Freiberg for Resource Technology, 09599 Freiberg, Germany * Correspondence: [email protected] Received: 23 October 2020; Accepted: 5 November 2020; Published: 10 November 2020 Abstract: We determined the halogen (F, Cl, Br, and I) and sulfur (S) concentrations in Cl-rich rock-forming minerals from five peralkaline complexes. We investigated sodalite (N = 42), eudialyte-group minerals (N = 84), and tugtupite (N = 8) from representative rock samples derived from Ilímaussaq (South Greenland), Norra Kärr (Sweden), Tamazeght (Morocco), Lovozero, and Khibina (Russian Federation). Taken together, sodalite and eudialyte-group minerals dominate the Cl and Br budget of the investigated rocks. For F, however, several other phases (e.g., amphibole, fluorite, villiaumite, and minerals of the rinkite group and the apatite supergroup) are additional sinks, and parts of the S may be scavenged in generally rare sulfides. The investigated minerals contain Cl at the wt.% level, F and S concentrations are in the hundreds to thousands of µg/g-range, Br is less common (0.2–200 µg/g) and I is rare (mostly well below 1 µg/g).
    [Show full text]
  • A Specific Gravity Index for Minerats
    A SPECIFICGRAVITY INDEX FOR MINERATS c. A. MURSKyI ern R. M. THOMPSON, Un'fuersityof Bri.ti,sh Col,umb,in,Voncouver, Canad,a This work was undertaken in order to provide a practical, and as far as possible,a complete list of specific gravities of minerals. An accurate speciflc cravity determination can usually be made quickly and this information when combined with other physical properties commonly leads to rapid mineral identification. Early complete but now outdated specific gravity lists are those of Miers given in his mineralogy textbook (1902),and Spencer(M,i,n. Mag.,2!, pp. 382-865,I}ZZ). A more recent list by Hurlbut (Dana's Manuatr of M,i,neral,ogy,LgE2) is incomplete and others are limited to rock forming minerals,Trdger (Tabel,l,enntr-optischen Best'i,mmungd,er geste,i,nsb.ildend,en M,ineral,e, 1952) and Morey (Encycto- ped,iaof Cherni,cal,Technol,ogy, Vol. 12, 19b4). In his mineral identification tables, smith (rd,entifi,cati,onand. qual,itatioe cherai,cal,anal,ys'i,s of mineral,s,second edition, New york, 19bB) groups minerals on the basis of specificgravity but in each of the twelve groups the minerals are listed in order of decreasinghardness. The present work should not be regarded as an index of all known minerals as the specificgravities of many minerals are unknown or known only approximately and are omitted from the current list. The list, in order of increasing specific gravity, includes all minerals without regard to other physical properties or to chemical composition. The designation I or II after the name indicates that the mineral falls in the classesof minerals describedin Dana Systemof M'ineralogyEdition 7, volume I (Native elements, sulphides, oxides, etc.) or II (Halides, carbonates, etc.) (L944 and 1951).
    [Show full text]
  • Villiaumite Naf C 2001-2005 Mineral Data Publishing, Version 1
    Villiaumite NaF c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Cubic. Point Group: 4/m 32/m. Crystals rare, cubic, to 15 cm, may show {111}, {hll}, {hkl}; commonly granular, massive. Physical Properties: Cleavage: {001}, perfect. Tenacity: Brittle. Hardness = 2–2.5 D(meas.) = 2.79 D(calc.) = 2.808 Soluble in H2O; dark red to orange and yellow fluorescence under SW and LW UV. Optical Properties: Transparent. Color: Carmine-red, lavender-pink to light orange. Streak: White. Luster: Vitreous. Optical Class: Isotropic; weak anomalous anisotropism, then uniaxial (–). Pleochroism: Strong; E = yellow; O = pink to deep carmine. n = 1.327–1.328 Cell Data: Space Group: Fm3m (synthetic). a = 4.6342 Z = 4 X-ray Powder Pattern: Synthetic. 2.319 (100), 1.639 (60), 1.338 (17), 1.0363 (12), 0.9458 (8), 1.1588 (7), 2.680 (3) Chemistry: (1) (2) (3) Na 53.4 53.83 54.75 K trace 0.32 Mg trace Ca 1.2 ZrO2 1.5 F 44.2 45.28 45.25 insol. 0.84 Total 100.3 100.27 100.00 (1) Los Islands, Guinea. (2) Lovozero massif, Russia. (3) NaF. Occurrence: In nepheline syenite and nepheline syenite pegmatites; in lake-bed deposits. Association: Aegirine, sodalite, nepheline, neptunite, lamprophyllite, pectolite, serandite, eudialyte, ussingite, chkalovite, zeolites. Distribution: On Rouma Isle, Los Islands, Guinea. On Mts. Karnasurt and Alluaiv, Lovozero massif, and from the Khibiny massif, Kola Peninsula, Russia. At Kvanefjeld, Il´ımaussaqintrusion, Greenland. From Aris, about 20 km south of Windhoek, Namibia. At Lake Magadi, Kenya. From Po¸cosde Caldas, Minas Gerais, Brazil.
    [Show full text]
  • 4. EUDIALYTE-EUCOLITES and PROBLEMS on TYPOMORPHISM of MINERALS Boris Ye
    NDM44_eng_09-11_091228:NDM44_02_pek_FMM_0909011.qxd 29.12.2009 18:27 Страница 97 New Data on Minerals. M., 2009. Vol. 44 97 THE ESSAYS ON FUNDAMENTAL AND GENETIC MINERALOGY: 4. EUDIALYTE-EUCOLITES AND PROBLEMS ON TYPOMORPHISM OF MINERALS Boris Ye. Borutzky Institute of Ore Deposit Geology, Petrography, Mineralogy and Geochemistry RAS, Moscow, [email protected] The present paper is a sequel to the previously published (Borutzky, 2008) essay on the minerals of variable com- position with variable structure (MVCVS) with an example of eudialyte-eucolites. The characteristic feature of this typical mineral from alkaline complexes is the unique ability to include up to one third of The Mendeleev’s Periodic Table of the chemical elements in its composition. This is entailed by a partial realignment of the crystal structure in response to changing chemistry and evolution of the mineral-forming environment with time. According to the author, the detailed typomorphous analysis of eudialyte-eucolites is more informative and use- ful in terms of genetic mineralogy rather than formal determination of dozens of independent mineral species. 3 tables, 48 references Keywords: eudialyte-eucolites, minerals of variable composition with variable structure. What is typomorphism and its issues natural chemical compounds, but worked towards determination of the relationship «We have to distinguish two types of between composition, structure, mineral prospecting features: one is related to the properties and conditions of formation, i.e. its nature of the objects sought for (minerals and genetic features in order to use them as the elements) that result from ion and lattice struc- mineralogical indicators for solving problems ture features.
    [Show full text]