Bloodstone (Heliotrope)
Quartz (var. Chalcedony) with Hematite inclusions · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal crystal system; Cryptocrystalline (microcrystalline structure) habit, typically occurring as massive, nodular, or pebbles.
Mineral Group
Silicates (Tectosilicate subgroup), Quartz group, Chalcedony variety
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of Fe2O3 (Iron Oxide/Hematite) and various chlorite minerals
Formation Process
Hydrothermal/Sedimentary process; forms by the precipitation of silica from aqueous solutions at low temperatures, typically filling cavities in volcanic rocks or as replacement deposits in sedimentary environments.
About This Crystal
Opaque, dark forest-green chalcedony featuring scattered spots, streaks, or patches of bright red jasper (hematite). Luster is waxy to vitreous on fractured surfaces. The specimen shows a cryptocrystalline texture with no visible individual crystals.
Physical Characteristics
Color: Dark green with red spots; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.64; Tenacity: Brittle but tough; Fluorescence: Usually inert/none.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: Weak (up to 0.009); Pleochroism: None; Optical character: Aggregate; Phenomena: Usually none, though some may show a faint translucency at edges.
Hardness & Durability
Origin Region
Major sources include India (Deccan Traps), Brazil, Australia, Madagascar, and the United States (California). Forms in low-temperature hydrothermal environments and volcanic cavities.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Very good due to microcrystalline structure; Stability: Stable to light and most chemicals; suitable for all jewelry types including rings and bracelets.
Care & Maintenance
Safe to clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and steam cleaners if the stone has surface-reaching fractures. Store separately from harder gemstones like sapphire or diamond to prevent scratching.
Rarity & Value
Common; Value is determined by the balance and vividness of the red spots against the green background. Higher quality specimens feature distinct, bright red 'blood-like' spots. Treatments are uncommon but dyeing can occur.
Special Characteristics
The distinctive red inclusions are caused by iron oxide (Hematite), while the green body color is usually attributed to chlorite, actinolite, or celadonite inclusions within the silica matrix.
Lore & History
Historically known as 'Heliotrope' (from Greek for 'Sun-turner'). In Christian lore, it was believed the red spots formed from the blood of Christ falling onto green jasper at the foot of the cross. Traditionally associated with the Root Chakra and believed to promote courage and physical vitality.