Black Chalcedony tumbled
A variety of Black Agate
What is Black Chalcedony tumbled?
Black Chalcedony tumbled is a translucent or opaque gemstone whose color range from dark gray to black. Like all chalcedony types, it is mined in numerous localities, but pure black Chalcedony tumbled is rarely found. It is often sold in the form of beads and tumbled stones.
Optical Properties
- Refractive Index
- 1.530-1.543
- Birefringence
- 0.003-0.009
- Pleochroism
- None
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Black Chalcedony 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 Chalcedony tumbled Localities Map
See where Black Chalcedony 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
- SiO2
- Elements
- O, Si
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