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Grossite

Oxide mineral

Summary

Oxide mineral

Field	Value
name	Grossite
image	Grossite.png
category	Oxide minerals
formula	CaAl4O7
IMAsymbol	Gss
strunz	4.CC.15
dana	07.03.02.01
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/c
unit cell	a = 12.94, b = 8.91
c = 5.44 [Å]; β = 107.01°; Z = 4
color	Colorless to white
habit	Lathlike or subhedral rounded grains in polycrystalline aggregates rimmed by melilite (in meteorites)
luster	Vitreous
streak	White
diaphaneity	Transparent
gravity	2.88
opticalprop	Biaxial (+)
refractive	nα = 1.618 nβ = 1.618 nγ = 1.652
birefringence	δ = 0.034
2V	Measured: 15°
references

(same H-M symbol) c = 5.44 [Å]; β = 107.01°; Z = 4 | length fast/slow = 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.

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.

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.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://www.mindat.org/min-1754.html Mindat.org]
[http://webmineral.com/data/Grossite.shtml Webmineral data]
[http://rruff.geo.arizona.edu/doclib/hom/grossite.pdf Handbook of Mineralogy]

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

oxide-minerals monoclinic-minerals minerals-in-space-group-15 meteorite-minerals

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