Cat's-Eye Glass
A variety of Glass
What is Cat's-Eye Glass?
The term cat's-Eye Glass is used to describe a cabochon gemstone that features an interesting optic phenomenon called "the chatoyant effect" or the "cat's eye effect". This effect is manifested in a narrow, sharp streak of light that goes across the center of the stone, resembling a cat's eye. Among numerous gemstones that reveal this effect, the most famous and with the finest quality is Cymophane, a variety of the mineral known as Chrysoberyl.
Optical Properties
- Refractive Index
- 1.48-1.70
- Optical Character
- Isotropic
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Cat's-Eye Glass 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.
Cat's-Eye Glass Localities Map
See where Cat's-Eye Glass is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Health & Safety Information
- ⚠️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.
Quick Facts
Physical Properties
- Color
- Various colors
- Hardness (Mohs)
- 5 - 6
- Density
- 2.4 - 2.8 g/cm³
- Streak
- Luminous, White
- Luster
- Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Si, O
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Cat's-Eye Glass FAQs
How do I identify Cat's-Eye Glass?
Cat's-Eye Glass can be identified by its hardness of 5 - 6 on the Mohs scale, Various colors color, Vitreous luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Cat's-Eye Glass?
Cat's-Eye Glass typically appears in Various colors. Color can vary depending on impurities and formation conditions.
How hard is Cat's-Eye Glass?
Cat's-Eye Glass has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.