Green Jasper
A variety of Jasper
What is Green Jasper?
Used since the earliest days of human civilization, green Jasper has been an important stone for ornaments and jewelry. Suitable for fine polishing, this attractive Jasper variety has been used for carved ornaments, beads, ring inlays, and cabochons. One of the most famous green Jasper varieties is the one with small red dots known as Bloodstone or Heliotrope.
Optical Properties
- Refractive Index
- 1.54
- Birefringence
- 0.003-0.009
- Pleochroism
- None
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Green Jasper 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 Green Jasper
Green Jasper is a variety of Jasper. RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find jasper in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find jasperAlways check the local rules and get the landowner's permission before you collect.
Health & Safety Information
- ⚠️Green Jasper in powdered form can be toxic due to its Crystalline Silica content.
- ⚠️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.
- ⚠️Green Jasper is typically non-toxic unless it's in powder form. Long-term exposure to finely ground powder may lead to silicosis. Therefore, when cutting or polishing green Jasper, be sure to wear a dust mask to avoid inhaling its dust.
Quick Facts
Physical Properties
- Color
- Green
- Hardness (Mohs)
- 6.5 - 7
- Rock tumbling
- Tumbles well
- Density
- 2.58 - 2.91 g/cm³
- Streak
- White
- Luster
- Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Si, O
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Green Jasper FAQs
How do I identify Green Jasper?
Green Jasper can be identified by its hardness of 6.5 - 7 on the Mohs scale, Green color, Vitreous luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Green Jasper?
Green Jasper typically appears in Green. Color can vary depending on impurities and formation conditions.
How hard is Green Jasper?
Green Jasper has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.