A copperaluminiumsulfatemineral, Cu4Al2(OH)12SO4·2H2O, also known as lettsomite, very similar to halotrichite, and a member of the same group. However, it is much rarer. It forms velvety aggregates of extremely fine fibres and radial aggregates.
The main deposits are Cap la Garrone in the Var (France), Romania and Arizona (USA). Because of its beautiful colouring, lettsomite is very popular with collectors.
Cyanotrichite (from the Greek for "blue hair") and malachite from the Grandview Mine in Coconino County, Grand Canyon, Arizona.
It's a hydrated copper aluminum hydroxysulfate and forms incomplete series with carbonate-cyanotrichite and camerolaite, where carbonate and antimonate ions replace some of the sulfate ions respectively.
A beautiful finger miniature of cyanotrichite and brochantite from the Viegar Mine (La Vieja), Potrerillos, Atacama Province, Chile.
Feeds |
Contact