Dolomite

Formula	CaMg(CO3)2
Origin	Ojos Negros (Spanien)
Description
Classification (Lapis)	Carbonates
Crystal System	trigonal
Hardness	3,5 – 4,0
Colour	colorless, white, yellow, brown, pale pink; colorless in transmitted light
Streak	white
Luminescence
Luster	vitreous
Transparency (Opacity)	transparent to translucent
Cleavage	perfect
Fracture	subconchoidal
Magnetism	negative
Geological Setting	formed by diagenesis or hydrothermal metasomatism of limestone
Specific Gravity	2,86 g/cm3