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
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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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