Grossite
(repeating unit)CaAl4O7 IMA symbol Gss[1] Strunz classification 4.CC.15 Dana classification 07.03.02.01 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group C2/c Unit cell a = 12.94, b = 8.91
c = 5.44 [Å]; β = 107.01°; Z = 4 Identification Color Colorless to white Crystal habit Lathlike or subhedral rounded grains in polycrystalline aggregates rimmed by melilite (in meteorites) Luster Vitreous Streak White Diaphaneity Transparent Specific gravity 2.88 Optical properties Biaxial (+) Refractive index nα = 1.618 nβ = 1.618 nγ = 1.652 Birefringence δ = 0.034 2V angle Measured: 15° References [2][3][4] Meteorite... Classification
Mineralogy
and petrology Lists
(same H-M symbol)
c = 5.44 [Å]; β = 107.01°; Z = 4
Grossite is a calcium aluminium oxide mineral with formula CaAl4O7. It is a colorless to white vitreous mineral which crystallizes in the monoclinic crystal system.[3][4]
Grossite was first described 1994 for an occurrence in the Hatrurim Formation of Israel. It was named for Shulamit Gross (1923–2012) of the Geological Survey of Israel.[2][4]
It occurs within high temperature metamorphosed impure limestone of the Hatrurim Formation and also within calcium-aluminium rich inclusions in chondritic meteorites. Associated minerals in the Hatrurium include brownmillerite, mayenite and larnite. In meteorites it occurs with perovskite, melilite, hibonite, spinel and calcium rich pyroxene.[2]
See also
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 Handbook of Mineralogy
- ^ a b Mindat.org
- ^ a b c Webmineral data
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