Cobble Creek: Kyanite in Matrix from Brazil
Nice Kyanite in Matrix from Brazil. Select your specimen from the dropdown. Each box is sized at 2.5" x 2.5".
Weight / Size:
A1: 86g / L: 2.6" x H: 1.6" x 1.2" W
A2: 56g / L: 1.8" x H: 0.7" x 1.5" W
A3: 57g / L: 2.5" x H: 0.7" x 1.4" W
B1: 42g / L: 2.4" x H: 0.9" x 1.3" W
B2: 51g / L: 2.8" x H: 0.9" x 1.2" W
B3: 57g / L: 2.6" x H: 0.8" x 1.5" W
C1: 51g / L: 2.3" x H: 0.7" x 1.1" W
C2: 46g / L: 2.6" x H: 0.6" x 1.3"W
C3: 71g / L: 2.2" x H: 1.1" x 1.2" W
Country of Origin: Brazil
Kyanite is a typically blue aluminosilicate mineral, commonly found in aluminium-rich metamorphic pegmatites and/or sedimentary rock. Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars. Although potentially stable at lower pressure and low temperature, the activity of water is usually high enough under such conditions that it is replaced by hydrous aluminosilicates such as muscovite, pyrophyllite, or kaolinite. Kyanite is also known as disthene, rhaeticite and cyanite.
Kyanite is a member of the aluminosilicate series, which also includes the polymorph andalusite and the polymorph sillimanite. Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction. In kyanite, this anisotropism can be considered an identifying characteristic.
At temperatures above 1100 °C kyanite decomposes into mullite and vitreous silica via the following reaction: 3(Al2O3·SiO2) → 3Al2O3·2SiO2 + SiO2. This transformation results in an expansion.
Its name comes from the same origin as that of the color cyan, being derived from the Ancient Greek word κύανος. This is generally rendered into English as kyanos or kuanos and means "dark blue".
1-2 business days
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Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.
Just contact me within: 7 days of delivery
Ship items back to me within: 14 days of delivery
But please contact me if you have any problems with your order.
Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:
Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.