Grossite
A variety of Minerals
What is Grossite?
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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Grossite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Grossite Localities Map
See where Grossite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White to colourless
- Density
- 2.88 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- CaAl4O7
- Elements
- Al, Ca, O
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Grossite FAQs
How do I identify Grossite?
Grossite can be identified by its White to colourless color. Look for these key characteristics when examining specimens.
What color is Grossite?
Grossite typically appears in White to colourless. Color can vary depending on impurities and formation conditions.
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