Botryoidal Chalcedony
What is Botryoidal Chalcedony?
Botryoidal Chalcedony is a form of chalcedony that exhibits a botryoidal (grape-like) growth habit. It forms in rounded, bubbly masses, often with a translucent to opaque appearance. The color can vary widely, including shades of purple, green, blue, and white, depending on the presence of trace elements. It is a cryptocrystalline form of quartz, meaning that its crystals are too small to be seen without magnification. Botryoidal Chalcedony is often found in volcanic rocks and geodes.
Optical Properties
- Pleochroism
- None
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Botryoidal Chalcedony 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.
Botryoidal Chalcedony Localities Map
See where Botryoidal Chalcedony is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Purple, green, blue, white
- Hardness (Mohs)
- 6.5-7
- Density
- 2.58-2.64 g/cm³
- Luster
- Vitreous to waxy
Chemical Properties
- Chemical Formula
- SiO2·nH2O
- Elements
- Si, O, H
Also Known As
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Botryoidal Chalcedony FAQs
How do I identify Botryoidal Chalcedony?
Botryoidal Chalcedony can be identified by its hardness of 6.5-7 on the Mohs scale, Purple color, Vitreous to waxy luster. Look for these key characteristics when examining specimens.
What color is Botryoidal Chalcedony?
Botryoidal Chalcedony typically appears in Purple, green, blue, white. Color can vary depending on impurities and formation conditions.
How hard is Botryoidal Chalcedony?
Botryoidal Chalcedony has a hardness of 6.5-7 on the Mohs scale. This gives it moderate hardness.