Bentorite
A variety of Minerals
What is Bentorite?
Bentorite is a mineral with the chemical formula Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O). It is colored violet to light violet. Its crystals are hexagonal to dihexagonal dipyramidal. It is transparent and has vitreous luster. It has perfect cleavage. It is not radioactive. Bentorite is rated 2 on the Mohs Scale. The mineral was first described in 1980 by Shulamit Gross for an occurrence in the Hatrurim Formation of Danian age along the western margin of the Dead Sea, Israel. It was named by its discoverer, Shulamit Gross, for Yaakov Ben-Tor (1910–2002), Professor at the Hebrew University of Jerusalem and the University of California, San Diego, California, US, for his contributions to geology and mineralogy in Israel.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bentorite 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.
Bentorite Localities Map
See where Bentorite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Violet to rose-purple
- Hardness (Mohs)
- 2
- Density
- 2.021 g/cm³
- Streak
- Very pale purple
Chemical Properties
- Chemical Formula
- Ca6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
- Elements
- Al, Ca, Cr, H, O, S
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Bentorite FAQs
How do I identify Bentorite?
Bentorite can be identified by its hardness of 2 on the Mohs scale, Violet to rose-purple color. Look for these key characteristics when examining specimens.
What color is Bentorite?
Bentorite typically appears in Violet to rose-purple. Color can vary depending on impurities and formation conditions.
How hard is Bentorite?
Bentorite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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