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n. A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

n. A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.

n. A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.

n. A cryptocrystalline variety of quartz, resembling in color milk diluted with water, and more or less clouded or opaque with veins, circles, or spots.

n. a milky or greyish translucent to transparent quartz

"There is a kind of onyx called a chalcedony, which hath the same qualities, [4151] avails much against fantastic illusions which proceed from melancholy, preserves the vigour and good estate of the whole body."

quartz    transparent gem   

chalcedony cement    conchoidally    break    flake    agate    flint    chert    shatter    conchoidal    fracture   

calcedony   

sardine    plasma    bloodstone    carnelian    agate    sardius    chrysoprase    cornelian    onyx    heliotrope   

chrysoprase    amethyst    sardonyx    sapphirine    chrysolite    jasper    lazuli    garnet    tourmaline    calcedony