Black Moonstone tumbled
A variety of Black Moonstone
What is Black Moonstone tumbled?
The black Moonstone tumbled is a dark grey, black-colored stone with veins of a peachy sand color. The best quality black Moonstone tumbled is found in Sri Lanka, although there are mines in India, Brazil, and Myanmar. It is liked for its shimmering adularescence. It is made into ornamental spheres, beads, and cabochons.
Optical Properties
- Refractive Index
- 1.518-1.527
- Birefringence
- 0.006-0.007
- Pleochroism
- None
- Optical Character
- Biaxial negative
- Dispersion
- 0.012
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Black Moonstone tumbled 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.
Black Moonstone tumbled Localities Map
See where Black Moonstone tumbled is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Streak
- White
Chemical Properties
- Chemical Formula
- (Ca, Na)[Al(Al, Si)Si2O8]
- Elements
- Al, Ca, Na, O, Si
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