What is Edenite?
Edenite is a sodium-dominant calcium amphibole, usually found in metamorphic rocks and skarns as prismatic or fibrous crystals.
Mineralogy and structure
Reference formula: NaCa2Mg5(Si7Al)O22(OH)2. Edenite has the monoclinic amphibole structure with double silicate chains and hydroxyl at the W site. Natural amphiboles are compositionally variable, so the formula is an ideal end-member reference.
Colour and appearance
Typical colours include white, grey, green, brown, pink-brown. The usual prismatic, fibrous, massive habit and vitreous lustre are useful descriptive features, but colour alone is not diagnostic.
Formation and localities
Edenite forms in or is associated with amphibolite-facies metamorphic rocks, marbles, skarns and alkaline contact zones. Important documented localities include the United States, Canada, Italy, Norway, Russia and other amphibole-bearing districts.
Collecting and care
Protect prismatic crystals from cleavage-related breakage; do not cut or grind unknown amphibole material without appropriate dust controls.
Edenite in popular symbolism
Modern crystal guides sometimes associate Edenite with symbolic themes based on colour or collecting tradition. These associations are cultural interpretations, not mineralogical or medical properties.
