Pumice

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Rock class:	Igneous Rock
Composition:	Quartz, Alkali Feldspar, Biotite, Amphibole.
Luster:	Dull Hardness (Moh's Scale): approximately 6-61/2
Color:	Light Gray to White
Fracture:	Irregular
Environment:	Volcanic.
Uses:	Pumice is used in chemical washing processes, filtration with selective absorption and as a soft abrasive.
Comments:	Associated minerals are biotite, hornblade, opal, orthoclase, magnetite, quartz, samidine and topaz.