A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Greifensteinite | |
---|---|
General | |
Category | Phosphate mineral Roscherite group |
Formula (repeating unit) | Ca2Fe2+5Be4(PO4)6(OH)4·6H2O |
IMA symbol | Gfs[1] |
Strunz classification | 8.DA.10 |
Dana classification | 42.7.7.4 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/c |
Unit cell | a = 15.903, b = 11.885 c = 6.677 ; β = 94.68°; Z = 2 |
Identification | |
Color | Yellow green, olive green, light brown |
Crystal habit | Prismatic |
Cleavage | Good on {100} (or parting on {100})[2] |
Fracture | Uneven |
Tenacity | brittle |
Mohs scale hardness | 4.5 |
Luster | Vitreous |
Streak | White, greenish |
Diaphaneity | Transparent to translucent |
Specific gravity | 2.93 |
Optical properties | Biaxial (-) |
Refractive index | nα: 1.624 nβ: 1.634 nγ: 1.638 |
Birefringence | 0.014 |
2V angle | 80° |
References | [2][3][4] |
Greifensteinite is beryllium phosphate mineral with formula: Ca2Fe2+5Be4(PO4)6(OH)4·6H2O. It is the Fe2+ dominant member of the roscherite group.[5] It crystallizes in the monoclinic crystal system and typically forms prismatic dark olive green crystals.[2]
It was first described in Germany at Greifenstein Rocks, Ehrenfriedersdorf, and was named for the location. At the type locality, it occurs within a lithium-rich pegmatite in miarolitic cavities. It was approved by the International Mineralogical Association in 2002.[2]
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 c d Greifensteinite data on Webmineral
- ^ Mindat.org
- ^ Mineralienatlas
- ^ Roscherite group on Mindat.org
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