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Euchroite
A valid IMA mineral species - grandfathered
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A rare secondary copper arsenate.
Metastable by comparison to related copper arsenates; may be pseudomorphed byolivenite.
In the crystal structure there are two symmetrically-independent Cu sites; the CuO6 octahedra are (typically) strongly distorted (Jahn-Teller distortion). As occurs in a single symmetrically independent site. The Cu-bearing octahedra share edges to form chains || [001]. The arsenate tetrahedra link the chains to constitute a framework, stabilized by hydrogen bonds involving OH groups and water molecules. The hydrogen bonding scheme is complex: there are strong two-center ones and bifurcated three-center ones. There are both bent and almost planar Cu-H2O configurations.
Metastable by comparison to related copper arsenates; may be pseudomorphed byolivenite.
In the crystal structure there are two symmetrically-independent Cu sites; the CuO6 octahedra are (typically) strongly distorted (Jahn-Teller distortion). As occurs in a single symmetrically independent site. The Cu-bearing octahedra share edges to form chains || [001]. The arsenate tetrahedra link the chains to constitute a framework, stabilized by hydrogen bonds involving OH groups and water molecules. The hydrogen bonding scheme is complex: there are strong two-center ones and bifurcated three-center ones. There are both bent and almost planar Cu-H2O configurations.
