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Quartz is a hard glossy
mineral made of silica (
silicon dioxide, SiO2
), it is the second
most common mineral in the Earth’s crust present in most
rocks
(particularly granite and sandstone) |
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| A very hard
mineral composed of
silica
found worldwide in igneous, sedimentary, and metamorphic
rocks, it
forms the rocks quartzite (quartz rock) and sandstone, and makes
most of the sand of the seashore. Usually colourless,
transparent
crystalline (can also be nearly any colour but is most often white,
grey, pink, or light brown) |
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