Vanadiocarpholite (Mn2+V3+AlSi2O6(OH)4) is straw yellow to brown silicate mineral. It crystallizes in the orthorhombic crystal system. It is the vanadium rich variety of carpholite (Mn2+Al2Si2O6(OH)4).
Discovery and occurrence It was first described in 2005 for an occurrence in the Molinello Mine, Graveglia Valley, Genova Province, Liguria, Italy. It occurs in chert in a manganese ore deposit as vein fillings in silicified wood.
Chemical composition It consists of: Manganese 15.56% Mn 20.09% MnO Aluminium 7.64% Al 14.44% Al2O3 Vanadium 14.43% V 21.23% V2O3 Silicon 15.91% Si 34.04% SiO2 Hydrogen 1.14% H 10.21% H2O Oxygen 45.32% O
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