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Mineral: QuartzNotesThe main crystalline mineral form of silica. White or milky quartz is an opaque white, greasy-looking and sharply angular very hard rock. Natural deposits of relatively pure quartz are plentiful and it is found in most rocks, it is is the most abundant mineral on earth and a fascinating study in the importance of considering the mineralogy of materials used in ceramics. For example, quartz and fused silica glass have the same chemistry, SiO2, but dramatically different physical properties (e.g. thermal expansion, hardness, specific gravity). From a theoretical perspective, quartz is a mineral. However in ceramics it is also considered a material, huge quantities of quartz powder are used in bodies and glazes. Out Bound Links
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