Eighth supplementary list of British Isles minerals (English) GEORGE RYBACK 42 Bell Road, Sittingbourne, Kent ME10 4EB, England AND PETER C. TANDY Department of Mineralogy, British Museum (Natural History), London SW7 5BD, England T n E supplementary lists of British Isles minerals mation and, although they deal mainly with record those minerals found in Great Britain, published work, in recording some occurrences Northern Ireland, and the Republic of Ireland that may otherwise remain unpublished. that are not included in Greg and Lettsom's Greg and Lettsom's Manual (1858), now widely Manual (1858). Seven such lists have been available in its reprinted form, still remains the published to date: only general reference work on British Isles minerals. Its age limits its usefulness and also First: Spencer, L. J. (1898) Rep. Br. Assoc. Adv. Sci., 875-7. perpetuates a somewhat antique image of the state of regional mineralogy in these countries. Second: ldem (1931) Ibid., 378. Third: Idem (1958) Mineral. Mag., 31, While a replacement for Greg and Lettsom's 787-806. Manual is not yet envisaged, the outlook for Fourth: Embrey, P. G. (1977), as appendix to English mineralogy has improved recently. The classic minerals of Cornwall and Devon are reprinted edition of Greg and Lettsom (1858), where the first three lists are also reprinted. splendidly described by Embrey and Symes Fourth list reprinted in Mineral Mag., 42,169-77. (1987), although their book does not aim to Fifth (Scottish): Livingstone, A. and Macpher- catalogue all the minerals or localities in these son, H. G. (1983) Mineral. Mag., 47, 99-105. counties. Young (1987) and Cooper and Stanley Sixth (Welsh): Bevins, R. E. (1988) Ibid., 52, (1990) have dealt comprehensively with all the 121--4. known occurrences in the Lake District, and in Seventh (Irish): Ryback, G., Nawaz, R., and the Caldbeck Fells area within the Lake District, Farley, E. (1988) Ibid., 52, 267-74. respectively, and these works should be consulted for further details of any Lake District mineral The last three, together with the present English mentioned in our list. list, represent a set equivalent to one of the earlier More than 850 species are now known from the lists, the faster pace of new discoveries dictating British Isles, and 580 or so from England. Of the division into smaller regional lists. An occur- these latter, about 116 are listed here as certain rence qualifies for inclusion in this English list new additions, together with a few interesting only if it is both the first in the British Isles and varieties of species already recorded from the from an English locality, although the practice of British Isles; the remainder of the 144 entries mentioning, where appropriate, additional finds concerns occurrences that need further work or in whatever region has been continued. are in some way doubtful. The list documents To keep the supplementary lists realistically over 170 published occurrences and 70 unpub- brief, none of them routinely includes corrections lished ones, and includes the following new of or deletions from Greg and Lettsom's Manual species: ashoverite, barstowite, ferrok~sterite, (1858), nor new and perhaps more significant sweetite, tristramite, and vochtenite. occurrences of species already on record. (A 'NHM' refers to the Natural History Museum mineral should not normally appear in more than (statutory name British Museum (Natural one list.) Nevertheless, the lists are useful in History)). NHM identifications were by powder bringing together a great deal of scattered infor- X-ray diffraction unless otherwise stated. Mineralogical Magazine, June 1992, Vol. 56, pp. 261-275 Copyright the Mineralogical Society 262 G. RYBACK AND P. C. TANDY Acknowledgements mine, St. Just, Cornwall (Elton and Hooper, We are grateful to C. Alabaster, D. Baker, R.E. 1992). Bevins, R.S.W. Braithwaite, D.P. CIough, N.J. Elton, J. Faithfull, J.G. Francis, N. Hubbard, V. Andradite, stannoan Holyer, A. Livingstone, S. Moreton, S. Rust, C. Sparrow, R.E. Starkey, R.F. Symes, P. Wallace, In tin-bearing skarns at Meldon, Devon (El M. M. Wirth, and B. Young for supplying unpublished Sharkawi and Dearman, 1966). material and answering queries. We thank especially C. J. Stanley for valuable comments and information. Antimony Sb Trigonal P. Perroud kindly provided data on minerals collected From Pengenna mine, St. Kew, Cornwall; by A. de Hailer at Tynagh mine, Ireland, unpublished except in newsletters (Bulletins d'information) of the Hannaford, near Barnstaple, Devon; and locali- Societ6 genevoise de minrralogie. ties in the Lake District, Cumbria (Ixer and Stanley, 1980). Inclusions (<5 ~tm) in galena at nine localities in the Lake District (Stanley and Akagangite [3-Fe3+O(OH,CI) Tetragonal Vaughan, 1981). Rare isolated granules (-<20 ~tm) in quartz, Wet Swine Gill, Caldbeck Significant component of siderite-calcite-Fe Fells, Cumbria (Fortey etal., 1984). [Also, as sulphide concretions being formed in reduced rare inclusions in galena, at Tynagh mine, Co. intertidal marsh and sandflat sediments, Warham Galway, Eire (Clifford etal., 1986). Earlier Marshes, Norfolk (Pye, 1988). Cf. Greigite. As a records are doubtful: Cornwall (First Supplemen- secondary mineral at Gravel Hill mine, Perranza- tary List); Doigelly gold field, Gwynedd, Wales buloe, Cornwall (C. Sparrow, pers. comm., 1991; (Andrew, 1910).] Arsenian antimony forms mi- XRD by Monica Price, Oxford). croscopic inclusions in arsenic in pegmatite at Meldon, Devon (von Knorring and Condliffe, Alloclase (Co,Fe)AsS Monoclinic 1984). Overgrowths (<0.5 mm) on arsenopyrite in a quartz-chlorite-apatite vein at Scar Crag, Causey Argentopyrite (?) AgFe2S3 Orthorhombic Pike, near Keswick, Cumbria (Ixer et al., 1979). As euhedral crystals (<150 • 30 ~tm), twinned 'stars' and aggregates of grains in an unusual Ag- Alluaudite Monoclinic Ni-Co mineral assemblage at Tynebottom mine, NaCaFe 2+ (Mn,Fe 2+ ,Fe 3+ ,Mg)2(PO4) 3 near Alston, Cumbria; the dimorph sternbergite A green alteration product of triphylite and occurs as grains within the argentopyrite aggre- possibly triplite in pegmatite at Megiliggar Rocks, gates (Ixer and Stanley, 1987). [The specimens, in Tremearne, Breage, Cornwall; XRD pattern and the Kingsbury Collection in NHM, may not be electron microprobe analysis consistent with from this locality (C. J. Stanley, pets. comm., those of alluaudite (Stone and George, 1983). 1990).] Alumohydrocalcite Triclinic Ashoverite Zn(OH)2 Tetragonai CaA12(CO3)e(OH)4.3H20 A new species, from an oxidised vein exposure White powdery patches in massive aliophane at Milltown quarry, near Ashover, Derbyshire, veins in sandstone, old museum specimens from forming groups of colourless 0.5 mm square Scarborough, North Yorkshire; and, associated plates on fluorite (Clark etal., 1988; Rust, 1991b). with halloysite, as white powdery aggregates Cf. Sweetite. between nodules of scarbroite in the infiU of solution pipes in sandstone, Weston Favell, Barbosalite Fe2+Fe~+(PO4)2(OH)2 Monoclinic Northamptonshire (Ryback, 1988). With allo- Present in the cores of spherules of 'andrewsite' phane, gibbsite, etc. in fissure-fill in limestone, from Wheal Phoenix, Linkinhorne, Cornwall Woodleaze quarry, Tytherington, Avon (Alabas- (Dunn, 1990). Cf. hentschelite. ter, 1989a). Barium-pharmacosiderite Tetragonal (?) Andersonite Trigonal BaFe~+(AsO4)6(OH)8.14HzO Na2Ca(UOz)(CO3)3.6H20 An electron microprobe analysis is given of a Small masses of intergrown bright yellow-green specimen from Cornwall (Peacor and Dunn, pseudocubic crystals (-<3mm), with schr6ck- 1985). [Also, as small yellow cubes, from Tynagh ingerite and gypsum, on walls of a level in Geevor mine, Co. Galway, Eire; XRD and qualitative MINERALS FROM THE BRITISH ISLES 263 EDS analysis (A. de Haller specimen; P. Per- Carnotite (?) Monoclinic roud, pers. comm., 1989).] K2(UOz)zV2Os.3H20 Bright yellow earthy from South Terras mine, Barstowite PB4(CO3)C12.H20 Monoclinic St. Stephen-in-Brannel, Cornwall; identified by A new species, forming aggregates of tiny qualitative chemical tests (Gramaccioli, 1955). subparallel elongate colourless crystals, as an [Unconfirmed. Francevillite occurs at this locality alteration product of phosgenite in lead veins at (Fourth Supplementary List).] Bounds Cliff, St. Endellion, Cornwall (Stanley et al., 1991). Chalcoalumite Monoclinic CuAI4(SO4)(OH) 12-3H~O Bayerite AI(OH)3 Monoclinic Pale blue to almost colourless, radiating, with Detected by XRD within a nodule containing copper, cuprite and brochantite, on childrenite, gibbsite and quartz, from the infill of solution at South Wheal Crebor (=New East Wheal pipes in Upper Chalk at Newhaven, East Sussex Russell), Tavistock, Devon (Braithwaite and (Wilmot and Young, 1985). Cooper, 1982); cf. carbonate-cyanotrichite. White spherules (-<0.05 ram) investing quartz Berthierite FeSb2S4 Orthorhombic crystals, with malachite, mimetite, brochantite, and chrysocolla, at Penberthy Croft mine, St. Occurs in antimony ore at Wheal Prosper, St. Hilary, Cornwall (NHM identification, 1985, D. Ewe, Cornwall (NHM identification, 1982, Clough specimen). [Also from two localities in R. W. Barstow specimens). Also at Wet Swine Wales (Bevins etal., 1985; Saich and Rust, Gill, Caldbeck Fells, Cumbria, as robust prisms 1987).] up to 2mm long (Fortey etal., 1984), and at Hogget Gill, Patterdale, Cumbria (A. Russell specimen in NHM, see Young, 1987). [Earlier Clausthalite PbSe Cubic records from Cornwall (Greg and Lettsom, 1858; A suite of rare selenides accompanies the Collins,