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Earth lab datasite

Orthoclase
Silicate with smoky quartz
potassium aluminosilicate
K Al Si3 O8
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Monoclinic
hardness 6.0 - 6.5
relative density 2.5 - 2.6
Mourne Mountains, Co. down, Ireland
24 M 4