description Smoky Quartz Overview
Smoky quartz is a gray, brown, or nearly black variety of quartz, the silicon dioxide mineral SiO2. Its color develops when natural gamma radiation acts on aluminum-related defects in the quartz lattice, although similar color can also be produced by laboratory irradiation. The variety occurs in many geological settings, especially cavities in igneous rocks and pegmatites, and is used both as a gemstone and as a mineral specimen; very dark material is sometimes called morion. It is traditionally regarded as Scotland's national gemstone.
help Smoky Quartz FAQ
What is smoky quartz?
Smoky quartz is a gray, brown, or nearly black variety of quartz. Quartz is silicon dioxide, with the chemical formula SiO2.
Why is smoky quartz brown or gray?
Its color develops when natural gamma radiation acts on aluminum-related defects in the quartz crystal lattice. Similar color can also be produced by laboratory irradiation.
Is all smoky quartz naturally colored?
No. Natural radiation creates much smoky quartz, but laboratory irradiation can produce a similar appearance. Buyers should ask whether treatment is disclosed.
Is smoky quartz a different mineral from quartz?
No. Smoky quartz is a color variety of quartz rather than a separate mineral species. Its distinctive color comes from defects and radiation effects in the crystal.
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