The Mineral Cyanotrichite

Cyanotrichite, also called Lettsomite, is a Hydrous Copper Aluminium Sulfate mineral. Cyanotrichite forms smooth,  radial,  acicular crystal aggregates having exceptionally fine fibers. It gets crystallized in the orthorhombic system to form translucent vivid blue acicular (radiating accumulation of slim, needle-like) crystal clusters or Druzy (Fine crystal coatings) coatings. Its specific gravity varies from 2.74 - 2.95.

Chemical Formula  
Cu4Al2 [(OH) 12|SO4]· 2H2O

Derivation of Name  
The cyanotrichite mineral gets its name from the Greek word “kyaneos” for "blue" and “triches” for "hair" pointing to the distinctive color and habit. Its former name, Lettsomite, comes from the name of William Garrow Lettsom (1804–1887), co-author of the 1858 Manual of Mineralogy of Great Britain and Ireland.

It is an oxidation produce of principal copper mineralization in weathering settings with plentiful aluminium and sulfate. Associated minerals are Brochantite, Chalcophyllite, Olivenite, Spangolite,  Parnauite, Azurite, Tyrolite and Malachite.

It’s used for treating muscular disorders, disease connected with adrenal glands, gonads, urogenital system, kidneys, and red blood corpuscles. Application of an elixir is known to hasten healing of burns and cuts. Also used for regulating and ease of handling of dietary limitations, for regulating levels of  cholesterol and blood.

The main deposits of Cyanotrichite minerals are from Arizona in the USA and Romania. In the year 1839 this mineral was seen in Banat, Moldova,  Noah and  Romania. Prominent places where it was found are Leadhills, Scotland; Nevada, Arizona and Utah in the USA,  Laurium, in Greece; France and Russia.

It is an amazingly colored mineral. Its brilliant blue, sky blue color is very striking. Cyanotrichite characteristically forms acicular or hair like crystals aggregated into radial clusters, sprays and tufts. Cyanotrichite is a gorgeous blue mineral having distinguishing glowing needle aggregates. It is an exceedingly delicate mineral, whose handling should be avoided, as even a slight touch can demolish a crystal grouping. If handled, its crystals rub off leaving behind a blue residue of tiny crystals.

Color is bright azure blue to sky blue.

2.76 g/cm3

The Mohs Scale  hardness is 2.

Refractive index
nα = 1.588 nβ = 1.617 nγ = 1.655

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