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Cachinnation
CACHINNATION, n. A variety of chalcedony, which is a subspecies of quartz, usually milk white, some times grayish or yellowish white; opake or slightly translucent at the edges. Its fracture is even, or conchoidal with large cavities, sometimes dull, sometimes pearly or glossy. It often envelops common chalcedony; the two minerals being united by insensible shades. It also associates with flint and semi-opal.
cachinnation appears in definitions for these words:
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