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Rock and Mineral Dictionary |
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quartz Quartz is a crystalline mineral that come in many forms, including amethyst, aventurine, citrin, opal, rock crystal, tiger's eye, rose quartz,and many others. Rutilated quartz and tourmalinated quartz have needle-like inclusions of other minerals. Quartz has a hardness of 7.0. This common mineral is found worldwide. |
quartz druze Quartz druze is a layer of quartz crystals that form within a mineral crust, like the inner cavity of a geode. For example, the inner cavity of agate geodes are often lined with a druze of sparkling quartz crystals. |
quinzite opal Quinzite opal is a red to pink type of opal. This opal is also called Quincite, Quincite Opal, and Rose Opal. |
Quaternary period The Quaternary period, "The Age of Man" (1.8 million years ago to the present), is the most recent period of geological time. |
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Rock and Mineral Dictionary |
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