CHIASTOLITE, n. A mineral, called also macle, whose crystals are arranged in a peculiar manner. The form of the crystals is a four-sided prism, whose bases are rhombs, differing little from squares. But each crystal, when viewed at its extremities, or on a transverse section, is obviously composed of two very different substances; and its general aspect is that of a black prism, passing longitudinally through the axis of another prism which is whitish. The term macle, as the name of a distinct species, applies to the whitish prisms only. |
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In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
