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

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

From New York Times • Nov. 1, 2018

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 • Mar. 3, 2016

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 Scientific American Supplement, No. 1082, September 26, 1896 by Various

The light mineral is finely granulated and the whole is marked by uneven extinction.

From The Long Labrador Trail by Wallace, Dillon

The present search for gold may bring to light mineral resources of Ceylon which have hitherto lain hidden.

From Eight Years' Wanderings in Ceylon by Baker, Samuel White, Sir