Trona
Chemical Formula	Na3(CO3)(HCO3)?2H2O
Species	Carbonates
Crystal System	Monoclinic
Mohs Scale	2
Specific Gravity	2.11-2.17
Color	Colorless or white, also grey to yellowish grey
Streak	White
Luster	Vitreous
Refractive Index	n = 1.412 n = 1.492 n = 1.540
Diaphaneity	Translucent
Cleavage	PerfectOn perfect; on and in traces.
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Columnar, fibrous and massive.
Geological Setting：Saline lakes and their evaporites; efflorecences on soils in arid regions.