Bloodstone
Quartz var. Heliotrope · Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline aggregate forming massive or rounded pebble habits
Mineral Group
Silicates
Chemical Formula
SiO2
Formation Process
Hydrothermal and sedimentary deposition involving silica-rich solutions replacing other rocks at low temperatures
About This Crystal
A tumbled, polished dark green opaque stone with subtle lighter greenish-grey patches and a waxy to vitreous luster on its smooth, rounded surface
Physical Characteristics
Dark green body color with occasional red spots if classic heliotrope, white streak, uneven to conchoidal fracture, no cleavage, specific gravity around 2.65, brittle tenacity
Optical Properties
Microcrystalline structure displays aggregate double refraction, refractive index around 1.544-1.553, typically opaque with no significant pleochroism
Hardness & Durability
Origin Region
India, Brazil, Australia, USA, and Scotland, typically found in sedimentary deposits and hydrothermal veins
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness making it durable for daily wear in jewelry despite lack of cleavage
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemicals or ultrasonic cleaners, store separately to avoid scratching softer stones
Rarity & Value
Common to uncommon, value depends heavily on the vibrancy of the green body color and contrast of red jasper inclusions, widely affordable
Special Characteristics
Opaque chalcedony variety traditionally defined by red iron oxide spots resembling blood, though green-only varieties exist
Lore & History
Historically known as the martyr's stone in Christian lore, associated with courage, vitality, and grounding in modern crystal healing practices