Hibonite
A variety of Minerals
What is Hibonite?
Hibonite is a mineral with the chemical formula (Ca,Ce)(Al,Ti,Mg)12O19, occurring in various colours, with a hardness of 7.5–8.0 and a hexagonal crystal structure. It is rare, but is found in high-grade metamorphic rocks on Madagascar. Some presolar grains in primitive meteorites consist of hibonite. Hibonite also is a common mineral in the Ca-Al-rich inclusions found in some chondritic meteorites. Hibonite is closely related to hibonite-Fe (IMA 2009-027, (Fe,Mg)Al12O19)) an alteration mineral from the Allende meteorite. A very rare gem, hibonite was discovered in 1953 in Madagascar by Paul Hibon, a French prospector.
Optical Properties
- Refractive Index
- 1.79-1.807
- Pleochroism
- Brownish gray, gray
- Optical Character
- Uniaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hibonite 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.
Hibonite Localities Map
See where Hibonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Black to brownisk black
- Hardness (Mohs)
- 7.5 - 8
- Density
- 3.83 - 3.85 g/cm³
- Streak
- Brown
Chemical Properties
- Chemical Formula
- CaAl12O19
- Elements
- Al, Ca, O
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Hibonite FAQs
How do I identify Hibonite?
Hibonite can be identified by its hardness of 7.5 - 8 on the Mohs scale, Black to brownisk black color. Look for these key characteristics when examining specimens.
What color is Hibonite?
Hibonite typically appears in Black to brownisk black. Color can vary depending on impurities and formation conditions.
How hard is Hibonite?
Hibonite has a hardness of 7.5 - 8 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
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