Bloodstone (Heliotrope)
Quartz var. Bloodstone (Chalcedony variety) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal crystal system); typically occurs in microcrystalline or cryptocrystalline massive habits with no visible individual crystals.
Mineral Group
Silicates (Tectosilicates); Quartz group, Chalcedony variety.
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of Iron Oxide/Hematite (Fe2O3) or Chlorite/Amphiboles
Formation Process
Hydrothermal/Sedimentary process; formed by the precipitation of silica-rich fluids at relatively low temperatures in cavities of volcanic rocks or through sedimentary groundwater processes.
About This Crystal
A dark green, opaque variety of chalcedony. This specific tumbled specimen exhibits a deep forest green base with flecks or patches of yellowish-tan and brownish inclusions. It has a vitreous to waxy luster and a smooth, polished surface.
Physical Characteristics
Color: Dark green with red, yellow, or brown spots/streaks; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.58–2.64; Tenacity: Brittle but tough due to microcrystalline structure.
Optical Properties
Refractive Index: 1.530–1.540; Birefringence: Up to 0.004; Pleochroism: None; Diaphaneity: Opaque (can be translucent on thin edges); Singly refractive (aggregate).
Hardness & Durability
Origin Region
Notably sourced from India (Madras), Brazil, Australia, China, and the United States (California/Oregon). It typically forms in volcanic cavities and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Very good (lack of cleavage makes it durable); Wearability: Excellent for jewelry like rings and pendants.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals and ultrasonic cleaners if the stone has significant fractures. Store away from harder stones like diamonds to prevent scratching.
Rarity & Value
Common; Value is determined by the vividness of the green base and the distribution of red 'blood' spots (though yellow and brown varieties like the one pictured are also found). Usually very affordable.
Special Characteristics
The classic variety features red spots of Hematite. This specimen shows 'Fancy Jasper' characteristics where yellow or mossy inclusions replace the traditional red spots.
Lore & History
Historically known as 'Heliotrope' (Sun Turner), it was used in ancient times for seals and amulets. In Christian lore, it was believed to have formed from Christ’s blood falling on green jasper. It is traditionally associated with the Root Chakra and believed to represent courage and vitality.