Nacrite
A variety of Minerals
What is Nacrite?
Nacrite Al2Si2O5(OH)4 is a clay mineral that is polymorphous (or polytypic) with kaolinite. It crystallizes in the monoclinic system. X-ray diffraction analysis is required for positive identification. Nacrite was first described in 1807 for an occurrence in Saxony, Germany. The name is from nacre in reference to the dull luster of the surface of nacrite masses scattering light with slight iridescences resembling those of the mother of pearls secreted by oysters.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Nacrite 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
- White, grey, yellowish, brownish, etc.
- Hardness (Mohs)
- 2 - 2.5
- Rock tumbling
- Not recommended
- Streak
- White
Chemical Properties
- Chemical Formula
- Al2(Si2O5)(OH)4
- Elements
- Al, H, O, Si
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Nacrite FAQs
How do I identify Nacrite?
Nacrite can be identified by its hardness of 2 - 2.5 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Nacrite?
Nacrite typically appears in White, grey, yellowish, brownish, etc.. Color can vary depending on impurities and formation conditions.
How hard is Nacrite?
Nacrite has a hardness of 2 - 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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