Epidote in Quartz
A variety of Quartz
What is Epidote in Quartz?
Epidote in Quartz is unusual material made from green, needle-like fibers or prismatic crystals surrounded by clear quartz. This silicate mineral is mostly used as a semi-precious stone. Although green is the most frequent color, it can vary from yellow-green to almost black. It often contains very small fibers of actinolite.
Optical Properties
- Refractive Index
- 1.544-1.553
- Birefringence
- 0.009
- Pleochroism
- Weakly dichroic
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Epidote in Quartz 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.
Where to Find Epidote in Quartz
Epidote in Quartz is a variety of Quartz. RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find quartz in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find quartzAlways check the local rules and get the landowner's permission before you collect.
Quick Facts
Physical Properties
- Color
- Pistachio-green to pale green, yellow, yellowish green, greenish yellow, greenish black, yellow-green in thin section
- Density
- 3.38 - 3.49 g/cm³
- Streak
- Gray
Chemical Properties
- Chemical Formula
- {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
- Elements
- Al, Ca, Fe, H, O, Si
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Epidote in Quartz FAQs
How do I identify Epidote in Quartz?
Epidote in Quartz can be identified by its Pistachio-green to pale green color. Look for these key characteristics when examining specimens.
What color is Epidote in Quartz?
Epidote in Quartz typically appears in Pistachio-green to pale green, yellow, yellowish green, greenish yellow, greenish black, yellow-green in thin section. Color can vary depending on impurities and formation conditions.
