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Anatacamite

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Formula:
Cu2(OH)3Cl
Colour:
Emerald green
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
3.725 (Calculated)
Crystal System:
Triclinic
Name:
Originally named for its (apparent) triclinic symmetry and its polymorphism with atacamite.
Synonym:
A synonym of Clinoatacamite
Originally thought to be a separate, triclinic polymorph of atacamite, clinoatacamite and paratacamite, and visually indistinguishable from the latter two.

Discredited 5 years after publication as twinned clinoatacamite (IMA Proposal 15-A).

Note that a small part of the lot that contained "anatacamite" was also sold in 2008 as paratacamite (Tony Nikischer information).



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References for AnatacamiteHide

Reference List:
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Malcherek, T. & Schlüter, J. (2010): Anatacamite from La Vendida mine, Sierra Gorda, Atacama desert, Chile: a triclinic polymorph of Cu2(OH)3Cl. Neues Jahrbuch für Mineralogie - Abhandlungen, 187, 307-312.
Proposal 15-A (July 2015)

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