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When ground water, carrying dissolved silica, is forced into a porous area of a rock, rapid cooling often occurs, causing the formation of tiny crystals on the surfaces or in cavities of the rock. The clear crystals often form on top of previously deposited minerals. This is called a drusy. Some minerals found in this form are chrysocolla, malachite, hematite, psilomelane, uvarovite, pyrite, carnelian, emerald, ruby, and cobalto-calcite.
Tiny quartz crystals, which form on or within the surface of other stones, are a drusy. Drusy, druse, druze, druzy, drusies, and druzies are the different spellings for this phenomenon.
The titanium drusy is an agate drusy that has been coated with titanium in a vacuum chamber. It produces a permanent metallic coating in spectacular shades of light, dark blue or iridescent white. |
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