Class

silicate mineral

Compound type

phyllosilicate

Chemical functions

	Function	Number	Relevance
	$R-OH$	2	main

Chemical bonds

	Bond	Number	Relevance
	$\geq Si-O-$	16
	$V-O$	5
	$-O-H$	2	main

Oxides

Formula	$CaO$	$V_{2}O_{5}$	$SiO_{2}$	$H_{2}O$
Mass fraction (%)	12.42	20.15	53.24	15.96

Strunz

Class

silicates (09)

Division

phyllosilicate (09.E)

Family

Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings (09.EA)

Code

09.EA.50

Dana

Major class

silicates (VIII)

Class

phyllosilicate modulated layers (74)

Type

with joined strips (74.03)

Group

V phyllosilicates (74.03.07)

Code

74.03.07.01

Phase type

crystalline

Crystal system

orthorhombic

Crystal class

dipyramidal

Crystal class symbol

mmm (D2h)

Crystal spacegroup

Pnma

Comments

not standard space group given as Pcmn (No 62)

Texture

polycrystalline

Molar mass

451.42 $g/mol$

Density

2.21 - 2.31 $g/cm^3$

Refringence type

biaxial

Refringence sign

positive

Birefringence

0.009

Refraction index $n_{\alpha}$

1.542

Refraction index $n_{\beta}$

1.544

Refraction index $n_{\gamma}$

1.551

Color

greenish blue, dark blue

Diaphaneity

transparent to translucent

Luster

vitreous