Strontianite
Chemical Formula	SrCO3
Species	Carbonates
Crystal System	Orthorhombic
Mohs Scale	3
Specific Gravity	3.74-3.78
Color	Colourless, white, gray, light yellow, green, brown; colourless in transmitted light
Streak	White
Luster	Vitreous, Resinous
Refractive Index	n = 1.516 - 1.520 n = 1.664 - 1.667 n = 1.666 - 1.668
Diaphaneity	Transparent, Translucent
Cleavage	Very GoodOn nearly perfect; on poor; on in traces.
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Prismatic, acicular, pseudo hexagonal, columnar to fibrous, granular, massive
Geological Setting：Forms in low-temperature hydrothermal deposits in limestone and marl or as a gangue mineral in sulfide veins; as geodes or concretionary masses in limestone or clay.