Bloodstone (Heliotrope)
Quartz var. Heliotrope · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal crystal system; Cryptocrystalline (Microcrystalline) habit occurring in massive, tumbled form
Mineral Group
Silicates (Tectosilicates); Chalcedony group
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of Fe2O3 (Hematite)
Formation Process
Sedimentary or Hydrothermal; forms at relatively low temperatures as silica-rich fluids precipitate in cavities of volcanic rocks or sedimentary environments.
About This Crystal
A dark green, opaque variety of chalcedony quartz featuring splatters or veining of red. It displays a waxy to vitreous luster when polished, with a smooth surface texture and a dense, cryptocrystalline structure.
Physical Characteristics
Color: Deep green with red spots; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.58-2.64; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.530-1.540; Birefringence: Up to 0.004; Pleochroism: None; Optical Character: Aggretate/Singly Refractive behavior due to micro-structure.
Hardness & Durability
Origin Region
Notable sources include India (Deccan Traps), Brazil, Australia, Madagascar, and the United States (California). Found in volcanic rocks and as alluvial pebbles.
Hardness & Durability
Mohs Hardness: 6.5 to 7; Toughness: Excellent (very durable due to interlocking structure); Stability: Stable under normal light and heat.
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for most ultrasonic cleaners if free of fractures; store separately to avoid scratching softer stones; avoid harsh chemicals and acids.
Rarity & Value
Common to Uncommon; Value is determined by the balance of color (vivid green vs. bright red spots) and lack of yellow/brown patches. Highly affordable, usually $1-$10 for tumbled stones.
Special Characteristics
Features a unique 'blood-like' spotting caused by iron oxide (Hematite) inclusions against a green plasma (chlorite-included chalcedony) background.
Lore & History
Historically known as 'Heliotrope' (Sun Turner); in the Middle Ages, the red spots were believed to be the blood of Christ. Traditionally associated with the Root Chakra and used by ancient warriors as an amulet for protection and stopping blood flow.