Glittering Stones >> semi
precious stones >> Quartz
Semi Precious Stone Quartz
Quartz is amongst one of the most common and precious
minerals in the Earth's continental crust. It has a hexagonal crystal
structure made of the trigonal crystallized silica (silicon dioxide, SiO2),
with a hardness of 8 on the Mohs scale. Density
is 2.66. The typical shape is a six-sided prism, which ends in six-sided
pyramids, although these are often twinned, distorted, and so massive
that only part of the shape is apparent from a mined specimen. Additionally
it has bed is a common form, particularly for gems
varieties such as amethyst, where the crystals
actually grow up from a matrix and thus only one termination
pyramid is present. A quartz geode consists of a hollow
rock (usually with an approximately spherical shape) with a core lined
with a bed of the crystals.
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Historical Facts of Quartz
| Refractive Index |
1.544 - 1.553 |
| Chemical Composition |
SiO2 |
| Hardness |
7 |
| Density |
2.65 |
| Crystal Group |
Trigonal |
| Ocurrence |
Every continent |
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Gemstone Quartz Jewlery
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