satin spar

noun

, Mineralogy.

1. a fibrous variety of gypsum having a silky luster, used as a gem.

Word History and Origins

Origin of satin spar¹

First recorded in 1795–1805

Example Sentences

Satin spar is still another variety often seen in mineral collections.

From Project Gutenberg

The stalactites here are very beautiful, assuming the structure of satin spar.

From Project Gutenberg