Imperial Mahenge Umbalite Garnet 4.36Ct Natural Umbalite Garnet Tanzania
- UGS
- Dimensions (mm)
- 9.900 x 8.500 x 6.400mm
- Poids (cts)
- 4.360
- Treatment
- No Treatment
- Shape
- Oval
- Taper
- Faceted
- Clarity
- VVS
- Couleurs
-
Garnet is the name used for a large group of rock-forming minerals. These minerals share a common crystal structure and a generalized chemical composition of X3Y2(SiO4)3. In that composition, "X" can be Ca, Mg, Fe2+ or Mn2+, and "Y" can be Al, Fe3+, Mn3+, V3+ or Cr3+.
These minerals are found throughout the world in metamorphic, igneous, and sedimentary rocks. Most garnet found near Earth's surface forms when a sedimentary rock with a high aluminum content, such as shale, is subjected to heat and pressure intense enough to produce schist or gneiss. Garnet is also found in the rocks of contact metamorphism, subsurface magma chambers, lava flows, deep-source volcanic eruptions, and the soils and sediments formed when garnet-bearing rocks are weathered and eroded.
Most people associate the word "garnet" with a red gemstone; however, they are often surprised to learn that garnet occurs in many other colors and has many other uses. In the United States, the major industrial uses of garnet in 2012 were waterjet cutting (35%), abrasive blasting media (30%), water filtration granules (20%), and abrasive powders (10%).
Item Details
- UGS
- Dimensions (mm)
- 9.900 x 8.500 x 6.400 mm
- Poids (cts)
- 4.360
- Treatment
- No Treatment
- Shape
- Oval
- Taper
- Faceted
- Clarity
- VVS
- Couleurs
-
Garnet is the name used for a large group of rock-forming minerals. These minerals share a common crystal structure and a generalized chemical composition of X3Y2(SiO4)3. In that composition, "X" can be Ca, Mg, Fe2+ or Mn2+, and "Y" can be Al, Fe3+, Mn3+, V3+ or Cr3+.
These minerals are found throughout the world in metamorphic, igneous, and sedimentary rocks. Most garnet found near Earth's surface forms when a sedimentary rock with a high aluminum content, such as shale, is subjected to heat and pressure intense enough to produce schist or gneiss. Garnet is also found in the rocks of contact metamorphism, subsurface magma chambers, lava flows, deep-source volcanic eruptions, and the soils and sediments formed when garnet-bearing rocks are weathered and eroded.
Most people associate the word "garnet" with a red gemstone; however, they are often surprised to learn that garnet occurs in many other colors and has many other uses. In the United States, the major industrial uses of garnet in 2012 were waterjet cutting (35%), abrasive blasting media (30%), water filtration granules (20%), and abrasive powders (10%).
Item Details
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Positif
The color of this gem is not bright neon pinkish red so it hardly can be named the jedi spinel, but anyhow it is a pretty classic red spinel and the stone is not too dark. The delivery was fast.
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Positif
Very nice! Thank you.
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Négatif
The sapphire that arrived looks nothing like the one I bid on. The image displayed a bright pink/purple round cut sapphire but the stone I received was a dull brown/purple round cut with no pink visible.