Bloodstone (Heliotrope)
Quartz var. Chalcedony (Bloodstone) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal), typically occurring in microcrystalline or massive crypto-crystalline habits.
Mineral Group
Silicates (Tectosilicates); Quartz group
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of Iron Oxide or Chlorite
Formation Process
Formation occurs via low-temperature hydrothermal precipitation in volcanic rock cavities or sedimentary environments as silica-rich fluids cool.
About This Crystal
An opaque, dark green variety of chalcedony with a waxy to vitreous luster. This specimen shows a dull, matte surface with visible planar fractures and a characteristic deep forest green hue.
Physical Characteristics
Color: Deep green (body), white/pale (streak); Cleavage: None (fractures conchoidally); Fracture: Conchoidal or splintery; Specific Gravity: 2.58–2.64; Luster: Waxy to dull; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Up to 0.009; Pleochroism: None; Optical character: Aggregate (cryptocrystalline).
Hardness & Durability
Origin Region
Notably India, Brazil, Australia, Germany, and South Africa; found in hydrothermal environments and volcanic cavities.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Very high due to interlocking micro-structure; Stability: Stable under normal light and heat.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners if the stone has significant fractures; store away from harder stones like diamonds.
Rarity & Value
Relatively Common; value is determined by the presence of red jasper (blood-like) spots, overall size, and color saturation ($5-$50 for typical specimens).
Special Characteristics
Known for its 'spots' of red iron oxide (though minimal in this specific piece); exhibits cryptocrystalline density making it very durable.
Lore & History
Historically known as 'Heliotrope' (Sun Turner). In ancient times, it was believed to represent the blood of Christ; traditionally used for protection and to boost physical vitality in crystal healing folklore.