Grape Agate
Grape Agate Chalcedony
A variety of Chalcedony
Uncommon
What is Grape Agate?
Grape Agate is not actually an agate at all. Grape Agate is a type of quartz that forms in clusters of light and dark purple spheres, resembling grapes. Its name has been enhanced for marketing purposes.
Optical Properties
- Refractive Index
- 1.530-1.543
- Birefringence
- 0.003-0.009
- Pleochroism
- None
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Grape Agate Market Value Calculator
Estimate the market value of Grape Agate using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Grape Agate Localities Map
See where Grape Agate is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
Health & Safety Information
- ⚠️Harm Reason: Grape Agate in powdered form can be toxic due to its Crystalline Silica content.
- ⚠️Physical Toxicity: Quartz, silica, crystalline silica and flint are non-toxic materials, but very fine dust containing quartz, known as respirable crystalline silicon (RCS), can cause serious and fatal lung disease. Lapidaries should exercise caution when cutting silica.
- ⚠️How to prevent the risks of Grape Agate?
Quick Facts
Physical Properties
- Color
- Deep purple to very pale amethystine or whitish, violet, green, purple, green
- Hardness (Mohs)
- 6.5 - 7
- Density
- 2.55 - 2.7 g/cm³
- Streak
- White
- Luster
- Waxy, Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Si, O
Also Known As
Grape AgateGrape ChalcedonyIndonesian Purple Chalcedony
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