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AGATE |
Quartz variety |
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ONYX |
Quartz variety |
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AMETHYST |
Variety of quartz |
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OVERSPEND |
Opaque variety of quartz |
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SIDERITE |
An indigo-blue variety of quartz. |
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MORION |
A dark variety of smoky quartz. |
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CITRINE |
A yellow, pellucid variety of quartz. |
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AVENTURINE |
A variety of translucent quartz, spangled throughout
with scales of yellow mica. |
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CACHOLONG |
An opaque or milk-white chalcedony, a variety of quartz;
also, a similar variety of opal. |
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HORNSTONE |
A siliceous stone, a variety of quartz, closely
resembling flint, but more brittle; -- called also chert. |
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CHALCEDONY |
A cryptocrystalline, translucent variety of quartz,
having usually a whitish color, and a luster nearly like wax. |
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CAIRNGORMSTONE |
A yellow or smoky brown variety of rock crystal, or
crystallized quartz, found esp, in the mountain of Cairngorm, in
Scotland. |
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CAT'S-EYE |
A variety of quartz or chalcedony, exhibiting opalescent
reflections from within, like the eye of a cat. The name is given to
other gems affording like effects, esp. the chrysoberyl. |
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PLASMA |
A variety of quartz, of a color between grass green and
leek green, which is found associated with common chalcedony. It was
much esteemed by the ancients for making engraved ornaments. |
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FLINT |
A massive, somewhat impure variety of quartz, in color
usually of a gray to brown or nearly black, breaking with a conchoidal
fracture and shar... |
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AMYGDALOID |
...all
cavities, occupied, wholly or in part, by nodules or geodes of
different minerals, esp. agates, quartz, calcite, and the zeolites.
When t... |
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JASPER |
An opaque, impure variety of quartz, of red, yellow, and
other dull colors, breaking with a smooth surface. It admits of a high
polish, and is ... |