Phosphates: Adamine
Diagnostic card.
In the photo: radiant aggregates of adamic crystals. Below: crystals of cobalt-containing varieties of adamin, characterized by a pink tint of color
Zn 2 AsO 4 OH
Diamond orthogonality
Hardness 3,5
Specific weight 4,3-4,5
Cleavage is good
Broken fracture
Color is colorless, greenish-yellow, bluish-yellow
Color in powder white
Glitter glass
It is represented by elongated crystals or radiant aggregates, colorless, greenish- and bluish-yellow. The cobalt-containing variety of adamine is pink. Adamine forms an isomorphic series with an olivite.
Chemical composition - content (in%): ZnO - 32-57; CuO - up to 24; CoO - up to 4; As2O5: 39-40; Fe2O3 - up to 1.5; H2O is 3.1 to 4.6. A rhombo-dipiramidal kind of symmetry. Cleavage, Cleavage is {101} good, according to {010} it's bad. Aggregates - Variable: often elongated along [010], also along [001], as in the olivine, rarely along [100]; Sometimes tabular to {101} or isometric. Crystals often coalesce into crusts or into coarse granular aggregates. In the close. Tr. Slightly cracked, emits a little water and becomes white and porcelain.
Diagnostic signs.
It dissolves even in dilute acids. Sometimes fluoresces in ultraviolet rays. It melts with a bang and at the same time becomes pale. Behavior in acids - easily soluble in dilute acids.
Origin.
Adamin is a secondary mineral of the oxidation zone of zinc deposits enriched also with primary arsenates. Associated with olivine, smithsonite, hemimorphite, malachite, azurite.
Deposits and applications.
There is information about the presence of adamine in many places where olivine is present: Cap Garonne in France, Lavrion in Greece, Ganyarsilo in Chile; He meets in Turkey and Algeria, Tsumeb (Namibia), Mapimi (Mexico). The mineral is interesting from a scientific and a collection point of view. Very much appreciated by collectors.
Adamin. Ojuela r-k, Mapimi, Durango, Mexico. Tucson-show-2007.
Adamin. Upper Mine. Dalnegorsk. Primorsky Krai, Russia (Russian Federation, CIS).
Adamin. Ojuela r-k, Mapimi, Durango Mine, Mexico. Photo: © А.А. Evseev.
Adamin. Coproperamine (copper). Tsumeb, Otavi-Bergland. Namibia.
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