What is Kamchatkite?
Kamchatkite is a rare potassium copper oxychloride sulfate from fumarolic volcanic environments, combining vivid colour with unusual high-temperature chemistry.
Mineralogy and crystal structure
Reference formula: KCu3O(SO4)2Cl. Kamchatkite has an orthorhombic oxychloride sulfate structure and forms under strongly oxidising fumarolic conditions. Its unusual anion combination makes locality and paragenesis essential to identification. Kamchatkite is classified with sulfates and has a orthorhombic crystal system. Typical hardness is 2.5–3 on the Mohs scale and specific gravity is approximately 3.5–3.7.
Colour, lustre and habit
Typical colours include green, blue-green, yellow, brown. The usual prismatic, tabular, granular habit and vitreous, pearly lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Kamchatkite forms in or is associated with fumaroles and volcanic sublimation zones. Important documented localities include the Kamchatka Peninsula, Russia, and other active volcanic environments.
A volcanic mineral from the edge of the elements
Kamchatkite is a natural focal point for a volcanic-mineral collection. Its green to blue-green colour and rare copper-sulfate-chloride chemistry make it feel both beautiful and genuinely unusual, especially beside other fumarolic minerals.
Collecting and care
Keep dry and protected from heat; avoid acids and retain the volcanic locality documentation.
