Alumohydrocalcite
A variety of Minerals

What is Alumohydrocalcite?
Alumohydrocalcite is a calcium aluminum carbonate mineral with the chemical formula CaAl2(CO3)2(OH)4·4H2O). Its type locality is Khakassia, Russia.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Alumohydrocalcite 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.
Alumohydrocalcite Localities Map
See where Alumohydrocalcite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Chalky white to pale blue, pale yellow, cream, gray; pale rose or brownish pink to dark violet in Cr-bearing varieties
- Hardness (Mohs)
- 2.5
Chemical Properties
- Chemical Formula
- CaAl2(CO3)2(OH)4 · 4H2O Previously assumed to have only three water molecules per formula unit.
- Elements
- Al, C, Ca, H, O
Also Known As

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Alumohydrocalcite FAQs
How do I identify Alumohydrocalcite?
Alumohydrocalcite can be identified by its hardness of 2.5 on the Mohs scale, Chalky white to pale blue color. Look for these key characteristics when examining specimens.
What color is Alumohydrocalcite?
Alumohydrocalcite typically appears in Chalky white to pale blue, pale yellow, cream, gray; pale rose or brownish pink to dark violet in Cr-bearing varieties. Color can vary depending on impurities and formation conditions.
How hard is Alumohydrocalcite?
Alumohydrocalcite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.


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