VS
Name
SiO₂
Formula
Ca(CO₃)
Mineral Species
Entry type
Mineral Species
Silicates
Chemical class
Carbonates
Hexagonal
Crystal system
Hexagonal
7
Mohs hardness
3
2.65–2.66
Specific gravity
2.71
White
Streak
White
Vitreous; waxy to dull when massive
Luster
Vitreous; pearly on cleavages and {0001}
Rarely observable, poor on {1011}, {0111}, {1010}, some others; rhombohedral parting
Cleavage
{1011}, perfect
P6_222
Space group
R-3c
Quartz
Structural group
Calcite
Qz · Approved
IMA
Cal · Grandfathered
0
Named in
0
Colorless, White, Purple, Yellow, Pink, Brown, Gray, Black
Typical colors
Colorless, White, Yellow, Brown, Red, Green, Blue, Gray
Si · O
Elements
Ca · C · O