Cyanotrichite

Formula: Cu4Al2(SO4)(OH)12 · 2H2O

Colour: Sky-blue, azure-blue

Lustre: Silky

Hardness: 1 – 3

Specific Gravity: 2.76

Crystal System: Monoclinic

Cyanotrichite Group.

Name: From the Greek κυανός for “blue” and θρίξ for “hair” in allusion to its colour and habit. Its name well describes its usual occurrence: plushlike encrustations of tiny, acicular, radiating crystals that are pale to dark blue in color.

Type Locality: Moldova Nouă Mine (Moldova Nova; Neumoldowa; Neu-Moldava; Újmoldova; Nová Moldava), Moldova Nouă, Caraş-Severin County, Romania

A secondary copper mineral found sparsely in the oxidation zones of copper-bearing ore bodies.
Cyanotrichite is closely related to Carbonatecyanotrichite, from which it is impossible to distinguish without XRD measurements (tests for carbonate are not conclusive). Visually similar to Khaidarkanite.