Apophyllite
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The name apophyllite refers to a specific group of phyllosilicates, a class of minerals. Originally, the group name referred to a specific mineral, but was redefined in 1978 to stand for a class of ... Wikipedia
Cleavage: Perfect on (001)
Color: Usually white, colorless; also blue, green, brown, yellow, pink, violet
Crystal habit: Prismatic, tabular, massive
Crystal system: Tetragonal
Formula (repeating unit): (K,Na)Ca4Si8O20(F,OH)·8H2O
Fracture: Uneven
IMA symbol: Apo