Stone Info

Feldspar

Feldspars are an aluminum tectosilicates. They are distinguished by the presence of alumina and silica.

• luster = vitreus, subvitreous, pearly, dull, greasy
• cleavage = perfect, good
• fracture = conchoidal, subconchoidal, uneven, splintery, irregular
• system = trigonal
• hardness= 6-6.5