Lyonsite
(repeating unit)Cu3Fe+34(VO4)6 IMA symbol Lyo[1] Strunz classification 8.AB.40 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pmcn Unit cell a = 10.29, b = 17.2
c = 4.91 [Å]; Z = 2 Identification Color Black; creamy white in reflected light in polished section Crystal habit As euhedral flattened lath shaped crystals Cleavage Good on {001} Tenacity Brittle Luster Metallic Streak Dark gray Diaphaneity Opaque Specific gravity 4.215 calculated References [2][3][4]
H-M symbol: (2/m 2/m 2/m)
c = 4.91 [Å]; Z = 2
Lyonsite (Cu3Fe+34(VO4)6) is a rare black vanadate mineral that is opaque with a metallic lustre. It crystallizes in the orthorhombic crystal system. Lyonsite often occurs as small tabular typically well formed crystals. Lyonsite has a good cleavage and a dark gray streak.
Lyonsite occurs as a sublimate in volcanic fumaroles. It is often associated with howardevansite and thenardite.[2] It was first described in 1987 for an occurrence on the Izalco volcano, El Salvador. It was named for mineralogist John Bartholomew Lyons (1916–1998) of Dartmouth College.[3] It has also been reported from a mine dump in the Lichtenberg Absetzer Mine of Thuringia, Germany.[4]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Mineral Handbook
- ^ a b Webmineral
- ^ a b Mindat
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