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Mineralati

Minerals

Cyanotrichite

cyanotrichite

Cu4Al2SO4(OH)12·2H2O

Blue Cyanotrichite Mineral Specimens,top Quality RARE Charming Raw ...

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Overview

Cyanotrichite is a hydrous copper aluminium sulfate mineral with formula Cu4Al2[(OH)12|SO4]·2H2O, also known as lettsomite. Cyanotrichite forms velvety radial acicular crystal aggregates of extremely fine fibers. It crystallizes in the monoclinic system and forms translucent bright blue acicular crystal clusters or drusey coatings. The Mohs hardness is 2 and the specific gravity ranges from 2.74 to 2.95. Refractive indices are nα = 1.588 nβ = 1.617 nγ = 1.655.

Identification characteristics

  • Mohs hardness 2

Scientific references

  1. Cyanotrichite — Wikidata. https://www.wikidata.org/wiki/Q421020 Link
  2. Cyanotrichite — Wikipedia. https://en.wikipedia.org/wiki/Cyanotrichite Link