Bloodstone
Chalcedony var. Heliotrope · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal, microcrystalline quartz with a massive habit
Mineral Group
Silicates, Tectosilicate subgroup
Chemical Formula
SiO2
Formation Process
Sedimentary and low-temperature hydrothermal deposition, formed by the deposition of silica-rich groundwater in cavities and fractures in rocks
About This Crystal
An opaque, dark green jasper matrix speckled with vibrant red spots and patches of iron oxide, cut into a coffin shape and highly polished with a vitreous to waxy luster
Physical Characteristics
Dark green with red inclusions, white streak, conchoidal fracture, cleavage absent, specific gravity around 2.65, brittle tenacity, inert under UV light
Optical Properties
Refractive index 1.544-1.553, doubly refractive, aggregate optical character, no pleochroism, aggregate birefringence
Hardness & Durability
Origin Region
India, Brazil, Australia, USA, and Scotland; forms in sedimentary rocks and low-temperature hydrothermal veins
Hardness & Durability
Mohs hardness 6.5 to 7, good toughness, durable for daily jewelry wear with no distinct cleavage
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemical cleaners and prolonged exposure to direct sunlight or extreme heat
Rarity & Value
Common to uncommon, value determined by the intensity and contrast of the red spots against the deep green background, typically moderately priced
Special Characteristics
Notable for its blood-like red spots caused by hematite or iron oxide inclusions contrasting against a green plasma background
Lore & History
Historically known as the martyr stone due to medieval lore suggesting the red spots were the blood of Christ; traditionally associated with courage, vitality, and healing in crystal lore