Quartz is the second most abundant mineral in Earth's continental crust, after
feldspar. .... Other opaque gemstone varieties of quartz, or mixed rocks including
quartz, often including contrast...
Rock crystal quartz: Transparent "rock crystal" quartz. This specimen shows the
conchoidal fracture (fracture that produces curved surfaces) that is characteristic
Quartz is one of the most well-known minerals on earth. It occurs in basically all
mineral environments, and is the important constituent of many rocks. Quartz is ...
Other stones the dinosaur may have swallowed broke down in the swirl of its
strong stomach acids, only leaving quartz rocks to survive as working gastroliths.
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The more common macrocrystalline quartz is made of visible crystals or grains.
Examples are rock crystals, the grains in sandstone, but also massive quartz that
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| See more about Labradorite, Amethysts and Opals.
It is found is all forms of rock: igneous, metamorphic and sedimentary. Quartz is
physically and chemically resistant to weathering. When quartz-bearing rocks ...
Items 1 - 12 of 789 ... For all its variety, when most people speak of "crystals", they are usually referring
to Rock Crystal (Clear Quartz), the six-sided prisms of pure ...
Alternate Names & Name Spellings: Rock Crystal, Crystal Quartz, Universal
Crystal, Clear Quartz (which is the stone behind all the shades and colors).