Bloodstone
Quartz var. Bloodstone (Heliotrope) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal); habit is microcrystalline/cryptocrystalline (Massive)
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 with trace inclusions of Iron Oxide (Hematite)
Formation Process
Hydrothermal or Sedimentary; forms at low temperatures when silica-rich fluids permeate through rock cavities or volcanic fissures.
About This Crystal
An opaque, dark green chalcedony featuring red to brownish-red spots or streaks. It exhibits a dull to waxy luster on its naturally weathered surface, which can be polished to a vitreous shine. The surface shown displays a pitted, water-worn texture with earthy red oxidation.
Physical Characteristics
Color: Forest green with red jaspar/hematite inclusions. Streak: White. Cleavage: None. Fracture: Conchoidal to uneven. Specific Gravity: 2.58–2.64. Fluorescence: Generally none.
Optical Properties
Refractive Index: 1.544–1.553. Birefringence: Up to 0.009. Pleochroism: None. Optical Effect: Opaque, showing no internal light play but distinct color mottling.
Hardness & Durability
Origin Region
India (notably the Deccan Traps), Australia, Brazil, and China; typically found in alluvial deposits or hydrothermal veins.
Hardness & Durability
Mohs Hardness: 6.5–7. Toughness: High (due to cryptocrystalline structure). Stability: Stable under normal light and heat.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals and ultrasonic cleaners if the stone has surface-reaching fractures or pits.
Rarity & Value
Common; value is determined by the balance and vividness of the red spots against the green background. Larger, more saturated pieces are preferred.
Special Characteristics
The red 'blood' spots are caused by inclusions of iron oxide (Hematite) or red jasper within the green chalcedony matrix.
Lore & History
Historically known as 'Heliotrope' (sun turner). In the Middle Ages, the red spots were believed to be the blood of Christ. Symbolically associated with vitality, strength, and protection; traditionally linked to the Root and Heart chakras.