Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A green, brown, or black splintery, cleavable pyroxene mineral, essentially (Fe,Mg)2Si2O6.

from The Century Dictionary.

  • noun A mineral related to pyroxene, but orthorhombic in crystallization.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy An inosilicate that is an orthorhombic pyroxene

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French hypersthène : hyper-, extreme (from Greek huper-; see hyper–) + Greek sthenos, strength; see segh- in Indo-European roots.]

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