Bloodstone
Quartz var. Heliotrope · Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline crypto-crystalline aggregate
Mineral Group
Silicates
Chemical Formula
SiO2
Formation Process
Hydrothermal low-temperature deposition in cavities and fractures of sedimentary or volcanic rocks
About This Crystal
Tumbled, highly polished opaque chalcedony specimen with a deep dark green background and distinctive mottled whitish-green to yellowish inclusions, giving it a striking appearance characteristic of heliotrope.
Physical Characteristics
Dark green body color with red and/or yellowish-white spots, white streak, conchoidal fracture, lack of visible cleavage, specific gravity of 2.58 to 2.91, brittle tenacity, vitreous to waxy luster
Optical Properties
Singly refractive aggregate, generally anisotropic under crossed polars with microcrystalline structure, no significant pleochroism
Hardness & Durability
Origin Region
India, Brazil, Australia, United States, and Germany
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness due to interlocking microfibrous quartz structure, suitable for all types of jewelry wear
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemicals or prolonged exposure to strong direct sunlight, store separately to prevent scratching softer stones
Rarity & Value
Common to uncommon, value depends heavily on the vividness of the green background color and contrast of inclusions, typically very affordable in tumbled forms
Special Characteristics
Distinctive color patterning featuring red spots caused by iron oxide or hematite inclusions, though this particular specimen emphasizes white/green chalcedony patches
Lore & History
Historically known as the martyr's stone in Christian tradition, believed in ancient times to have magical properties including the ability to stop bleeding and cause solar eclipses; associated traditionally with the root and heart chakras for grounding and courage