Baryte

Formula	BaSO4
Origin	Sidi Lahcen Mine, Nador (Morocco)
Description	thin light blue flakes of barite
Classification (Lapis)	Sulfates
Crystal System	orthorhombic
Hardness	3,0 – 3,5
Colour	Colorless, white, yellow, brown, gray, pale shades of red, green, blue, may be zoned, or change color on exposure to light
Streak	white
Luminescence	yellowish to partly orange
Luster	vitreous
Transparency (Opacity)	transparent to translucent
Cleavage	perfect
Fracture	uneven
Magnetism	negative
Geological Setting	A gangue mineral in low-temperature hydrothermal veins; in residual deposits from weathered barite-bearing limestones;
Specific Gravity	4,47 g/cm3