Answer:

feldspar

Answer	Crossword Clue
FELDSPAR	Orthoclase or albite
FELDSPAR	Igneous rock
FELDSPAR	Crystalline mineral

FELDSPAR	Mineral in granite
FELDSPAR	Crystalline mineral.
FELDSPAR	Crystal-like mineral
FELDSPAR	Rock-forming mineral
FELDSPAR	Igneous rock constituent
FELDSPAR	Important constituent of igneous rocks
FELDSPAR	Mineral that crystallizes from magma
FELDSPAR	Most of the earth's crust

FELDSPAR	60% of the earth's outer crust