
Smoky Quartz is a variety of quartz that ranges in color from a light grayish-brown to deep black, giving it a distinctive smoky appearance. Its rich tones and transparency make it a popular gemstone for jewelry and ornamental use. Below are its key descriptions and properties:
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Description:
- Color: Light brown, grayish brown, to nearly black.
- Transparency: Transparent to nearly opaque.
- Luster: Vitreous (glassy).
- Crystal System: Hexagonal (trigonal).
- Form: Commonly found as prismatic crystals, often with well-developed terminations. Also appears in massive or drusy form.
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Optical & Visual Features:
- Pleochroism: Weak to none.
- Transparency: Varies; lighter specimens are more transparent.
- Zoning: May have color zoning or be uniformly colored.
- Heat Sensitivity: Prolonged heat can change its color, turning it yellow or clear (amethyst can also become smoky quartz through irradiation).
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Origin of Color:
Smoky quartz gets its color primarily from natural radiation interacting with trace amounts of aluminum within the crystal structure. This radiation alters the crystal lattice, producing its smoky hue.
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Occurrence:
Found in many parts of the world, including:
- Brazil (one of the largest producers)
- Switzerland
- Scotland (where it’s the national gem)
- United States (notably Colorado and New Hampshire)
- Madagascar
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Metaphysical & Cultural Significance:
(Note: These are beliefs and not scientifically proven.)
- Believed to have grounding and protective properties.
- Often used in meditation and energy work to dispel negative energies.
- Associated with the root chakra, helping with stability and strength.
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Physical Properties
Property |
Details |
Chemical Formula |
SiOâ‚‚ (Silicon Dioxide) |
Mohs Hardness |
7 |
Specific Gravity |
2.65 |
Fracture |
Conchoidal to uneven |
Cleavage |
None (may show parting) |
Streak |
White |