Erythrite
Erythrite · Collector Mineral
Crystal System
Monoclinic, forming prismatic crystals, crusts, or earthy botryoidal aggregates
Mineral Group
Arsenates
Chemical Formula
Co3(AsO4)2·8H2O
Formation Process
Secondary mineral formed in the oxidation zone of cobalt-bearing hydrothermal ore deposits
About This Crystal
Displays a distinctive peach-red to crimson-pink coloration with a druzy to earthy habit, often coating a darker matrix of metallic ore
Physical Characteristics
Pink to crimson-red color, pale pink streak, good cleavage on {010}, sectile to flexible, specific gravity around 3.06
Optical Properties
Biaxial (-) with high refractive indices and strong pleochroism in shades of pink, rose, and magenta
Hardness & Durability
Origin Region
Bou Azzer, Morocco; Cobalt, Ontario, Canada; Schneeberg, Germany
Hardness & Durability
1.5 to 2.5 on the Mohs scale, highly brittle and soft, poor wearability for jewelry
Care & Maintenance
Handle with extreme care due to softness and arsenic content; wash hands after handling, keep dry and away from acids
Rarity & Value
Uncommon to rare collector mineral; high-quality specimens with vivid crystal druse command high prices among mineral collectors
Special Characteristics
Notable for its vibrant peach-pink color often referred to as 'cobalt bloom', and contains toxic arsenic
Lore & History
Historically used as an indicator mineral for cobalt and silver ores; in modern metaphysical practices sometimes associated with emotional healing and compassion, though primarily valued by mineralogists