5 Photos
Kalsilite
Chemical Formula	KAlSiO4
Species	Silicates
Crystal System	Hexagonal
Mohs Scale	6
Specific Gravity	2.6
Refractive Index	n = 1.538 - 1.543 n = 1.532 - 1.537

Kalsilite (KAlSiO₄) is a vitreous white to grey feldspathoidal mineral that is found in some potassium-rich lavas, such as from Chamengo Crater in Uganda. It has a relative hardness of 5.5.