Vanadiocarpholite
# Vanadiocarpholite

Vanadiocarpholite $(Mn^{+2}V^{+3}AlSi_2O_6(OH)_4)$ is straw yellow to brown silicate mineral. It crystallizes in the orthorhombic crystal system. It is the vanadium rich variety of carpholite $(Mn^{+2}Al_2Si_2O_6(OH)_4).$

## 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% | $Al_2O_3$ |
| Vanadium | 14.43% | V | 21.23% | $V_2O_3$ |
| Silicon | 15.91% | Si | 34.04% | $SiO_2$ |
| Hydrogen | 1.14% | H | 10.21% | $H_2O$ |
| Oxygen | 45.32% | O | | |
