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Quartz is the mineral defining the value of 7 on the ... called rock crystal or clear quartz, ... variety of crystalline quartz. The white color is caused by ...
Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like surface is glassy in appearance. Minor amounts of former cementing materials, iron oxide, silica, carbonate and clay, often migrate during recrystallization, causing streaks and lenses to form within the quartzite. [ 1 ]
Milky quartz (a cloudy white quartz) ... Rock crystal (quartz) ... Industrial mineral – Geological materials mined for commercial value in industry;
Mohawkite is a rare rock consisting of mixtures of arsenic, silver, nickel, skutterudite and copper, with the formula Cu 3 As up to Cu 6 As, and the most desirable material was usually found in a white quartz matrix. [1] It has a hardness of 3–3.5 and a metallic luster. [2] It is named after the Mohawk Mine, where it was originally found.
Quartz diorite – Igneous, plutonic rock – A diorite with >5% modal quartz; Quartz monzonite – Type of igneous rock – An intermediate plutonic rock, essentially a monzonite with 5–10% modal quartz; Quartzolite – Extremely rare igneous rock made mostly of quartz – An intrusive rock composed mostly of quartz
Hardness may be difficult to determine, or may be misleading or meaningless, if a material is a mixture of two or more substances; for example, some sources have assigned a Mohs hardness of 6 or 7 to granite but it is a rock made of several minerals, each with its own Mohs hardness (e.g. topaz-rich granite contains: topaz — Mohs 8, quartz ...
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Pegmatites in low-grade metamorphic rock tend to be dominated by quartz and carbonate minerals. Pegmatites in metamorphic rock of higher grade are dominted by alkali feldspar. [19] Gabbroic pegmatites typically occur as lenses within bodies of gabbro or diabase. [4] Nepheline syenite pegmatites are common in alkaline igneous complexes. [19]