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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
| Quartz Bracelet |
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| Quartz Earrings |
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| Quartz Necklace |
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| Quartz Rings |
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