Holtite
A variety of Minerals
What is Holtite?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Holtite 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.
Quick Facts
Physical Properties
- Color
- Light buff to cream-buff, deep olive-buff, brown, russet
- Hardness (Mohs)
- 8.5
- Rock tumbling
- Not recommended
- Density
- 3.6 - 3.9 g/cm³
- Streak
- Light buff
Chemical Properties
- Chemical Formula
- (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 Originally assumed to be Al6(Al,Ta)(SiO4,SbO4,AsO4)3(BO3)O3.
- Elements
- Al, B, O, Si, Ta
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Holtite FAQs
How do I identify Holtite?
Holtite can be identified by its hardness of 8.5 on the Mohs scale, Light buff to cream-buff color. Look for these key characteristics when examining specimens.
What color is Holtite?
Holtite typically appears in Light buff to cream-buff, deep olive-buff, brown, russet. Color can vary depending on impurities and formation conditions.
How hard is Holtite?
Holtite has a hardness of 8.5 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
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