Ulexite
Chemical Formula	NaCaB5O6(OH)6?5(H2O)
Species	Borates
Crystal System	Triclinic
Mohs Scale	2
Specific Gravity	1.95-1.96
Color	Colorless to white
Streak	White
Luster	Vitreous, Silky
Refractive Index	n = 1.491 - 1.496 n = 1.504 - 1.506 n = 1.519 - 1.520
Diaphaneity	Transparent
Cleavage	PerfectPerfect on ; on good; on poor.
Fracture	Irregular/Uneven
Crystal Habit：Acicular to fibrous
Geological Setting：Arid regions. In salt playas and desiccated saline lakes.