Phosphates, Arseniates and Vanadates
Phosphates, Arseniates, Vanadates: This class includes about 250 species, or 16% of the total but many are observable only in small crystals. This group of minerals is characterized by a group of 4 ions (atoms) of oxygen located at the tops of a tetrahedron around the pentavalent elements, phosphorus (P), vanadium (V) and arsenic (As). They may also be considered as salts of phosphoric acid (H3PO4), vanadium (H3VO4), or arsenic (H3aso4). Examples: monazite Cepo4, adamite Zn2aso4(OH), vanadinite Pb5(VO4)3Cl …
Primary phosphorus is generally present as apatite in almost all eruptive rocks, in some metalliferous deposits and in pegmatite veins. Arsenates and vanadates are secondary minerals formed in deposits of complex constitutions rich in arsenic and cobalt sulphide. More representatives of Phosphates, Arseniates and Vanadates are : Adamite, Annabergite, Fluorapatite, Augelite, Autunite, Brazilianite, Cafarsite, Descloizite, Erythrite, Lazulite, Legrandite, Libethenite, Ludlamite, Mimetite, Olivenite, Paravauxite, Vauxite, Plumbogummite, Pyromorphite, Roselite, Torbernite, Turquoise, Vanadinite and Vivianite.
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AUGELITE on QUARTZ from Peru
Beautiful Augelite green water crystals, delicately placed on…
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DIOPTASE and MIMETITE from DR of Congo
Recent discovery of Dioptase associated with Mimetite from…
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HERDERITE on TOPAZ from Pakistan
Very aesthetic piece composed of a green Herderite…
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MIMETITE on WULFENITE from Mexico
Magnificent specimen of Wulfenite and Mimetite from Mexico.…
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PLUMBOGUMMITE from China
Plumbogummite after crystals of Pyromorphite from China, with…
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PYROMORPHITE from Steinbach, France
Pyromorphite specimen from Steinbach, France. Crystals are green…
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Vanadinite from Morocco
Beautiful set of Moroccan Vanadinite crystals with an…
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VANADINITE on BARYTE from Morocco
Sublime crystals of dark red Vanadinite on white…
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