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New Data for Chiavennite and Ferrochiavennite

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New Data for Chiavennite and Ferrochiavennite 21 The Canadian Mineralogist Vol. 54, pp. 21-32 (2016) DOI: 10.3749/canmin.1500068 NEW DATA FOR CHIAVENNITE AND FERROCHIAVENNITE § JOEL D. GRICE Canadian Museum of Nature, PO Box 3443 Stn D, Ottawa KIP 6P4, Canada HENRIK FRIIS Natural History Museum, University of Oslo, PO Box 1172, Blindern, 0318 Oslo, Norway ROY KRISTIANSEN PO Box 32, N-1650 Sellebakk, Norway ABSTRACT Chiavennite (Mn endmember) and ferrochiavennite (Fe endmember) are beryllium silicate zeolites with chemical compositions close to Ca1–2(Mn,Fe)Si5Be2O13(OH)2Á2H2O. Five chiavennite crystals from four different localities, Chiavenna, Italy; Telemark, Norway; Uto,¨ Sweden; and Ambatovita, Madagascar, were chosen for crystal-structure analysis. Initially all had been reported to be orthorhombic, but all are monoclinic, with a b angle near 908, as is ferrochiavennite from Blafjell,˚ Norway. Twinning on {100} is common. Chiavennite and ferrochiavennite are isostructural. The zeolite structure consists of intersecting channels of nine-, six-, five-, and four-fold rings. All five structures have one Ca site in common while chiavennite from Uto¨ and ferrochiavennite from Blafjell˚ have a second, partially filled, Ca site. Hydrogen atoms were located in all five structures. Hydrogen bonding is similar but not identical in all five structures. The H atoms associated with BeO4 tetrahedra act as terminations to a polymerization sequence causing chiavennite and ferrochiavennite to be interrupted zeolite structures. Keywords: ferrochiavennite, chiavennite, interrupted zeolite framework, beryllium silicate, crystal structure, syenitic pegmatite, granite pegmatite, Italy, Norway, Sweden, Madagascar. INTRODUCTION determined, and full crystal structure analyses per- formed. Cametti & Armbruster (2015) have just Chiavennite was described as a new mineral by published a paper on the thermal behavior of Bondi et al. (1983) from Chiavenna, Italy and almost chiavennite from the type locality, Chiavenna, Italy concurrently by Raade et al. (1983) from the Oslo and describe it as monoclinic at room temperature Region, Norway. Subsequently a locality in Uto,¨ showing a continuous monoclinic–orthorhombic tran- Sweden was reported by Langhof et al. (2000) and sition from space group P21/c to Pbcn. in Ambatovita, Madagascar by Pezzotta et al. (2005). Recently the new mineral species ferrochiavennite was CHIAVENNITE AND FERROCHIAVENNITE SAMPLES described from two localities in the Oslo Region, Norway (Grice et al. 2013). During the investigation During the investigation of the new mineral, of ferrochiavennite it was found that it is monoclinic ferrochiavennite (Grice et al. 2013), the crystal and not orthorhombic as described for the previous structure work determined the mineral to be mono- localities. To ascertain whether or not the two species, clinic, while chiavennite is described as orthorhombic chiavennite and ferrochiavennite, actually had differ- (Bondi et al. 1983, Raade et al. 1983, Tazzoli et al. ent crystal systems, samples from all of the localities 1995). Initiated by the structural examination of listed above were obtained, the chemical composition ferrochiavennite and the recent results of Cametti & § Corresponding author e-mail address: [email protected] 22 THE CANADIAN MINERALOGIST Armbruster (2015), we re-examined chiavennite from Proterozoic pegmatite with a typical lithium and the type localities in Italy and Norway as well as the phosphate assemblage. two localities in Sweden and Madagascar. Sample ‘‘Ambatovita’’ (chiavennite) Sample ‘‘Chiavenna’’ (chiavennite) The Sakavalana pegmatite, Ambatovita, Ambatofi- Chiavenna, Lombardy, Italy, is the type locality nandrahana district, Madagascar (Pezzotta et al. 2004, (Bondi et al. 1983, Tazzoli et al. 1995). Chiavennite 2005) is a famous pegmatite where the new gemstone occurs as euhedral orange grains or crystals up to 0.4 pezzottaite was discovered (Laurs et al. 2003, mm in size, and as crusts coating beryl. It is usually Hawthorne et al. 2004). A large specimen (over 7 associated with bavenite and several other pegmatite kg) containing masses of brownish-red pezzottaite was minerals. It occurs in an alpine pegmatite cutting found in 2003 and was broken into smaller pieces Chiavenna ultramafic rocks in the Rhetic Alps in (Pezzotta et al. 2004). It contained groups of Northern Italy. At the locality magmatic beryl has pezzottaite crystals, liddicoatite, amazonite, quartz, been altered to bavenite and chiavennite by hydro- and large masses of brownish-red chiavennite forming thermal fluids rich in Ca and Mn. small aggregates of radiating crystals or globular aggregates 1–2 mm across, with single six-sided Sample ‘‘Telemark I’’ (chiavennite) crystals, mostly covered by a thin crust of pale blue This sample is from Langangen, Blafjell,˚ Telemark, chalcedony. Chiavennite formed as a late-stage Norway (Raade et al. 1983). The mineral forms mineral, probably from low-temperature hydrothermal aggregates of reddish orange spherules up to several B-rich solutions with strong activity of Be, Mn, Cs, millimetres in size in vugs in a syenitic pegmatite in and Ca, together with hambergite, bavenite, milarite, the Larvik plutonic complex (LPC) in the southern and a late generation of pezzottaite. Oslo region. Chiavennite was exposed during road construction of route E-18 between the Vestfold and Sample ‘‘Telemark II’’ (ferrochiavennite type locality) Telemark counties. This sample is from Langangen, Blafjell,˚ Telemark, Approximately 25 different species have been Norway (Grice et al. 2013). Crystal aggregates of identified in this pegmatite, including the beryllium ferrochiavennite occur as beige or pale yellow minerals hambergite, gadolinite-(Ce), leucophanite, spherules up to 2 mm in diameter in vugs in a syenitic epididymite, and eudidymite. pegmatite in the Larvik plutonic complex in the Chiavennite is the latest mineral to crystallize, southern Oslo region. The ferrochiavennite locality often on analcime and natrolite. It probably formed as was exposed during road construction of route E-18 a result of the alteration of the primary leucophanite or meliphanite. There is no direct proof of this alteration, between Vestfold and Telemark counties, and is but these two minerals are the most abundant primary situated less than 200 meters from the type locality Be minerals in the LPC. for chiavennite. Ferrochiavennite is the latest mineral to crystallize and is associated with albite, magnetite, Sample ‘‘Uto¨’’ (chiavennite) fayalite, zircon, nepheline, analcime, pyrite, and hambergite and probably formed as the result of the At Uto,¨ Sodermanland,¨ Sweden (Langhof & alteration of the primary minerals leucophanite and Holtstam, 1994, Langhof et al. 2000), chiavennite meliphanite. occurs in cracks and fracture infillings as rare aggregates of bright golden yellow, transparent, platy CHEMICAL DATA crystals or as crystals of thin tabular habit in groups or radiating clusters up to 5 mm in size. Other associated Chemical analyses were done at the Canadian beryllium minerals are milarite, genthelvite–helvite, Museum of Nature by wavelength-dispersive electron- and rarely thin blades of bavenite and beryl of primary microprobe (EMP) at 15 kV, 20 nA, 10 lm beam origin. The mode of occurrence of the locality diameter, with a counting of 20 s on the peak and 10 s indicates formation at low temperature (Langhof et on background. Fluorine was below detection limits. al. 2000). This is the only locality of chiavennite H2O was calculated by stoichiometry from the results where boron is determined to be substituting for of the crystal structure analysis (Hawthorne & Grice beryllium. The Uto¨ pegmatite is the type locality for 1990); all H atoms were found. BeO was calculated by four mineral species: spodumene, petalite, tantalite- stoichiometry from the results of the crystal structure (Mn), and holmquistite. Cookeite and eucryptite are analysis. Intensity data were corrected for inter- found as hydrothermal alteration products. This is a element overlaps, and for matrix effects using a NEW DATA FOR CHIAVENNITE 23 TABLE 1. CHIAVENNITE AND FERROCHIAVENNITE ANALYTICAL DATA EMP Emission Constituent CHIAVENNA[1] TELEMARK I[2] UTO¨ [3] AMBATOVITA[4] TELEMARK II[5] standard line SiO2 (wt.%) 50.84 49.30 51.16 51.07 46.00 diopside SiKa Al2O3 3.44 5.01 3.55 4.45 4.64 sanidine AlKa FeO 1.70 0.52 1.67 1.37 5.29 hematite FeKa MnO 10.64 12.30 10.78 11.00 4.04 tephroite MnKa MgO 0.04 0.05 0.06 0.15 0.13 diopside MgKa CaO 10.27 10.33 10.08 10.06 17.62 diopside CaKa Na2O 0.33 0.27 0.68 0.55 0.73 albite NaKa K2O 0.01 0.00 0.01 0.03 0.02 sanidine KKa BeO (8.24) (8.04) (8.32) (8.07) (10.37) H2O (9.59) (9.57) (9.68) (9.73) (9.81) Total 95.10 95.39 95.99 96.48 98.65 Si4þ (apfu) 4.76 4.63 4.75 4.72 4.22 Al3þ 0.38 0.56 0.39 0.48 0.50 Fe2þ 0.13 0.04 0.13 0.22 0.41 Mn2þ 0.84 0.79 0.85 0.86 0.31 Mg2þ 0.01 0.01 0.01 0.02 0.02 Ca2þ 1.03 1.04 1.00 1.00 1.73 Be2þ 1.86 1.81 1.86 1.80 2.28 Naþ 0.06 0.05 0.12 0.10 0.13 Kþ 0.00 0.00 0.00 0.10 0.00 Hþ 66666 O1717171717 Total cation 9.08 9.12 9.11 9.10 9.60 The empirical formulae (based on 17 anions pfu and 7 tetrahedral framework sites) are as follows. [1]: (Ca1.03Na0.06)R1.09(Mn0.84Fe0.13Mg0.01)R0.98(Si4.76Al0.38Be1.86)R7O13(OH)2Á2H2O [2]: (Ca1.04Na0.05)R1.09(Mn0.79Fe0.04Mg0.01)R0.84(Si4.63Al0.56Be1.81)R7O13(OH)2Á2H2O [3]: (Ca1.00Na0.12)R1.12(Mn0.85Fe0.13Mg0.01)R0.99(Si4.75Al0.39Be1.86)R7O13(OH)2Á2H2O [4]: (Ca1.00Na0.10)R1.10(Mn0.86Fe0.22Mg0.02)R1.10(Si4.72Al0.48Be1.80)R7O13(OH)2Á2H2O [5]: (Ca1.73Na0.13)R1.86(Fe0.41Mn0.31Mg0.02)R0.74(Si4.22Al0.50Be2.28)R7O13(OH)2Á2H2O Cameca version of the ‘PAP PhiRhoZ’ program indexed reflections.
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