Vanadiocarpholite (Mn+2V+3AlSi2O6(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+2Al2Si2O6(OH)4).
Discovery and occurrence
It was first described in 2005 for an occurrence in the Molinello Mine, Graveglia Valley, Genova Province, Liguria, Italy.[3] It occurs in chert in a manganese ore deposit as vein fillings in silicified wood.[2]
Chemical composition
It consists of:[2]
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
|
|
|
References