Xonotlite
A variety of Minerals
What is Xonotlite?
Xonotlite is a mineral with the chemical formula Ca6Si6O17(OH)2. It crystallizes in the monoclinic - prismatic crystal system with typically an acicular crystal form or habit. It can be colorless, gray, light gray, lemon white, or pink. It is transparent with a vitreous to silky luster. It leaves a white streak. Xonotlite is rated 6.5 on the Mohs scale of hardness. It was first described in 1866 and named for its occurrence in Tetela de Xonotla, Puebla, Mexico. It occurs as veins in serpentinite and contact metamorphism aureoles.
Optical Properties
- Refractive Index
- 1.581-1.593
- Birefringence
- 0.01
- Optical Character
- Biaxial positive
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Xonotlite 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.
Xonotlite Localities Map
See where Xonotlite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- White, grey, pale pink, colorless
- Hardness (Mohs)
- 6.5
- Density
- 2.71 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca6(Si6O17)(OH)2
- Elements
- Ca, H, O, Si
Also Known As
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Xonotlite FAQs
How do I identify Xonotlite?
Xonotlite can be identified by its hardness of 6.5 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Xonotlite?
Xonotlite typically appears in White, grey, pale pink, colorless. Color can vary depending on impurities and formation conditions.
How hard is Xonotlite?
Xonotlite has a hardness of 6.5 on the Mohs scale. This gives it moderate hardness.
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