Heliotrope
What is Heliotrope?
Heliotrope, also known as bloodstone, is a variety of chalcedony, a cryptocrystalline form of quartz. It is characterized by its dark green color with red spots or inclusions that resemble blood. The red spots are typically iron oxide.
Optical Properties
- Refractive Index
- 1.544-1.553
- Birefringence
- 0.004
- Pleochroism
- None
- Optical Character
- uniaxial (+)
- Dispersion
- 0.013
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Heliotrope 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.
Heliotrope Localities Map
See where Heliotrope is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Dark green with red spots
- Hardness (Mohs)
- 6.5 - 7
- Density
- 2.60 - 2.65 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon, Oxygen, Iron
Also Known As
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Heliotrope FAQs
How do I identify Heliotrope?
Heliotrope can be identified by its hardness of 6.5 - 7 on the Mohs scale, Dark green with red spots color. Look for these key characteristics when examining specimens.
What color is Heliotrope?
Heliotrope typically appears in Dark green with red spots. Color can vary depending on impurities and formation conditions.
How hard is Heliotrope?
Heliotrope has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.