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Rock quartz, 7.352ct from Austria, loup clean, top cut!!
- SKU
- Dimensions (mm)
- 12.900 x 12.900 x 7.880mm
- Weight (cts)
- 7.325
- Clarity
- VVS
- Treatment
- No Treatment
- Type
- Faceted
- Colours
-
Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent, and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. These color differentiations arise from chromophores which have been incorporated into the crystal structure of the mineral. Polymorphs of quartz include: α-quartz (low), β-quartz, tridymite, moganite, cristobalite, coesite, and stishovite.
Quartz is a hard, crystalline mineral composed of silicon and oxygen atoms. The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.
Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at 573 °C (846 K; 1,063 °F). Since the transformation is accompanied by a significant change in volume, it can easily induce fracturing of ceramics or rocks passing through this temperature threshold.
There are many different varieties of quartz, several of which are semi-precious gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia.
The most
important distinction between types of quartz is that of macrocrystalline
(individual crystals visible to the unaided eye) and the microcrystalline or
cryptocrystalline varieties (aggregates of crystals visible only under high
magnification). The cryptocrystalline varieties are either translucent or
mostly opaque, while the transparent varieties tend to be macrocrystalline.
Chalcedony is a cryptocrystalline form of silica consisting of fine
intergrowths of both quartz, and its monoclinic polymorph moganite. Other
opaque gemstone varieties of quartz, or mixed rocks including quartz, often
including contrasting bands or patterns of color, are agate, carnelian or sard,
onyx, heliotrope, and jasper.
Please pay your stones in between five days or contact me. Otherwise I need to cancel the deal.
Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible.
- SKU
- Dimensions (mm)
- 12.900 x 12.900 x 7.880 mm
- Weight (cts)
- 7.325
- Clarity
- VVS
- Treatment
- No Treatment
- Type
- Faceted
- Colours
-
Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent, and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. These color differentiations arise from chromophores which have been incorporated into the crystal structure of the mineral. Polymorphs of quartz include: α-quartz (low), β-quartz, tridymite, moganite, cristobalite, coesite, and stishovite.
Quartz is a hard, crystalline mineral composed of silicon and oxygen atoms. The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.
Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at 573 °C (846 K; 1,063 °F). Since the transformation is accompanied by a significant change in volume, it can easily induce fracturing of ceramics or rocks passing through this temperature threshold.
There are many different varieties of quartz, several of which are semi-precious gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia.
The most
important distinction between types of quartz is that of macrocrystalline
(individual crystals visible to the unaided eye) and the microcrystalline or
cryptocrystalline varieties (aggregates of crystals visible only under high
magnification). The cryptocrystalline varieties are either translucent or
mostly opaque, while the transparent varieties tend to be macrocrystalline.
Chalcedony is a cryptocrystalline form of silica consisting of fine
intergrowths of both quartz, and its monoclinic polymorph moganite. Other
opaque gemstone varieties of quartz, or mixed rocks including quartz, often
including contrasting bands or patterns of color, are agate, carnelian or sard,
onyx, heliotrope, and jasper.
Please pay your stones in between five days or contact me. Otherwise I need to cancel the deal.
Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible.
Shipping provider | Shipping to Austria | Shipping to rest of world |
---|---|---|
Standard Shipping - Tracked | $12.00 / 3 days | $16.00 / 21 days |
Austria
Standard Shipping - Tracked is discounted to $15.00 on orders with 3 or more items
Rest of the world
Standard Shipping - Tracked is discounted to $17.00 on orders with 3 or more items
|
||
FedEx | $27.00 / 2 days | $46.00 / 5 days |
Austria
FedEx is discounted to $26.00 on orders with 2 or more items
Rest of the world
FedEx is discounted to $45.00 on orders with 2 or more items
|
||
Express Shipping | $36.00 / 2 days | $75.00 / 5 days |
Austria
Express Shipping is discounted to $40.00 on orders with 3 or more items
Rest of the world
Express Shipping is discounted to $65.00 on orders with 3 or more items
|
||
Registered Shipping | $9.00 / 7 days | $16.00 / 21 days |
Austria
Registered Shipping is discounted to $15.00 on orders with 3 or more items
Rest of the world
Registered Shipping is discounted to $15.00 on orders with 3 or more items
|
||
Standard Shipping - Untracked | $5.00 / 3 days | $13.00 / 28 days |
Austria
Standard Shipping - Untracked is discounted to $15.00 on orders with 3 or more items
Rest of the world
Standard Shipping - Untracked is discounted to $13.00 on orders with 3 or more items
|
-
Positive
Brilliant white at my house, with a clear, flashy cut; thank you!
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