Pumice

Name:
Pumice
Detailed information:
A highly-porous igneous rock, usually containing 67–75% SiO₂ and 10–20% Al₂O₃, with a glassy texture. Potassium, sodium, and calcium are generally present. Insoluble in water, not attacked by acids.

Occurrence:

USA (Arizona, Oregon, California, Hawaii, New Mexico), Italy, New Zealand, Greece.

Grade:

Lump, powdered (coarse, medium, and fine); NF, technical.

Use:

Concrete aggregate, heat and sound insulation, filtration, finishing glass and plastics, road construction, scouring preparations, paint fillers, absorbents, support for catalysts, dental abrasive, abherent for uncured rubber products, possible substitute for asbestos, polishing agent for pedicures.