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Lustrous volcanic rock
Answer for the clue "Lustrous volcanic rock ", 7 letters:
perlite
Alternative clues for the word perlite
Word definitions for perlite in dictionaries
Wiktionary
Word definitions in Wiktionary
n. 1 (context mineralogy English) An amorphous volcanic glass formed by the hydration of obsidian. 2 The lightweight insulating material and aggregate resulting from expanding perlite glass by heat.
Wikipedia
Word definitions in Wikipedia
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian . It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Perlite \Per"lite\, n. (Min.) Same as Pearlite .
Usage examples of perlite.
The printed material explained that such jeans were faded with perlite from strip mines, and said strip mines were ruining the Jemez Mountain forests and the Jemez River.
Stonewashed jeans had declined in popularity and the market for Jemez Mountains perlite had significantly diminished.
I thought this was queer, he is always so dreadful perlite in his ways, but I thought it was a deal queerer when I saw him go up the front stairs, she hurrying after, looking I cannot tell you how, but awful troubled and anxious, I should say.
Stonewashed jeans had declined in popularity and the market for Jemez Mountains perlite had significantly diminished.