Niter
ID: 57
Niter
Chemical Formula
KNO₃
Hardness (Mohs)
2
Crystal System
Orthorhombic
Streak
white
Luster
vitreous
Diaphaneity
translucent to transparent
Color
white or gray, also tinted yellow or brown by impurities
Cleavage
good in two directions (prismatic)
Density
approximately 2.1
Fun Facts
Also known as saltpeter, it was a crucial ingredient in gunpowder and has been historically important for fertilizers and food preservation. Fracture: uneven or irregular.