Erythrite
Erythrite · Mineral Specimen
Crystal System
Monoclinic, prismatic crystals, more commonly forming earthy, crusting, or botryoidal aggregates
Mineral Group
Arsenates
Chemical Formula
Co3(AsO4)2·8H2O
Formation Process
Secondary mineral formed via the oxidation and weathering of primary cobalt and arsenic-bearing minerals in hydrothermal veins.
About This Crystal
The specimen features a grayish host rock matrix hosting an inner cavity lined with vibrant, deep pink to crimson-red micro-crystals and crusts of erythrite, displaying a vitreous to pearly luster and translucent to opaque transparency.
Physical Characteristics
Color: Crimson red, peach, pink, or grayish pink. Streak: Pale pink. Cleavage: Perfect on one plane. Fracture: Conchoidal to uneven. Specific Gravity: Approximately 3.06. Tenacity: Sectile to flexible in thin crystals, brittle.
Optical Properties
Biaxial (positive), with high birefringence and distinct pleochroism showing shades of pink, rose-red, and pale greenish or yellowish.
Hardness & Durability
Origin Region
Notable sources include Bou Azzer in Morocco, Schneeberg in Germany, and Cobalt in Ontario, Canada, typically found in the oxidized zones of cobalt-nickel ore deposits.
Hardness & Durability
Mohs Hardness: 1.5 to 2.5 (very soft, like gypsum and talc). Poor durability and high sectility make it completely unsuitable for jewelry wear.
Care & Maintenance
Extremely fragile and soft. Clean gently with a soft brush only; avoid water immersion, harsh chemicals, ultrasonic cleaners, and prolonged exposure to direct sunlight.
Rarity & Value
Uncommon mineral specimen, highly valued by mineral collectors for its striking crimson-pink coloration. Prices range from moderate to high depending on crystal definition, matrix quality, and locality.
Special Characteristics
Often known as 'cobalt bloom' due to its characteristic earthy peach-pink or crimson encrustations on cobalt ores; contains toxic arsenic.
Lore & History
Historically used as an indicator mineral for prospectors searching for cobalt and silver deposits. In modern metaphysical circles, it is sometimes associated with emotional healing and transformation, though these are traditional beliefs with no scientific backing.