light mineral

American  

noun

Geology.

1. any rock-forming mineral that has a specific gravity of less than 2.8 and is generally light in color.

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Example Sentences

Bayer’s Campho-Phenique Pain & Itch Relief still contains camphor and phenol along with inactive ingredients: colloidal silicon dioxide, eucalyptus oil, glycerin and light mineral oil.

From Seattle Times

Made of pinot noir, and more rosé than white, it is pleasant, with light mineral and herbal notes.

From New York Times

Make sure that your mix has at least 25 to 30% by volume of perlite, a light mineral that aids drainage.

From Los Angeles Times

Opal, which is a comparatively light mineral, has a low refractive power; zircon or jargoon is a heavy mineral, and has a high refractive power.

From Project Gutenberg

This perplexing problem was solved in a very peculiar manner by an experiment on the part of a wealthy Plasdenite, who, seven thousand years ago, took advantage of the extremely light mineral products of this world and built for himself a floating mansion which covered about ten acres according to our measurements.

From Project Gutenberg