| Pyroxene (pyroxene) |
|---|
| n. | (?) |
|---|
| Pyr"ox*ene |
| [F.
pyroxène, from Gr. (?) fire + (?) a stranger; -- so
called because it was supposed to the be a stranger, or of rare
occurrence, in igneous rocks,] (Min.) |
A common mineral
occurring in monoclinic crystals, with a prismatic angle of nearly
90°, and also in massive forms which are often laminated. It
varies in color from white to dark green and black, and includes many
varieties differing in color and composition, as diopside, malacolite,
salite, coccolite, augite, etc. They are all silicates of lime and
magnesia with sometimes alumina and iron. Pyroxene is an essential
constituent of many rocks, especially basic igneous rocks, as basalt,
gabbro, etc.
|
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In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 