Description: If making multiple purchases, please read the note following the red text below. Hand specimen of black kyanite - Al2SiO5 São José de Safira, Minas Gerais State, BrazilKyanite forms when aluminum-rich rocks are metamorphosed, and is frequently found in schists that formed at medium to high pressures and lower temperatures in areas of regional metamorphism. At higher temperatures, kyanite converts to sillimanite.Occasionally the metamorphism produces a pegmatite with large crystals that form when a fluid-rich magma allows rapid movement of atoms. These large crystals of kyanite and the surrounding quartz are the product of that process. This kyanite was mined in the vicinity of the town of São José de Safira, Minas Gerais State, southeastern Brazil, a famous locality for this material. It is a polymorph of sillimanite and andalusite, sharing composition but differing in crystal structure.The geologic setting at São José de Safira is a schist belt 30 km wide and 100 km long that is interpreted as an accretionary wedge in a basin that closed during the assembly of West Gondwanaland.Kyanite was named by Abraham Gottlieb Werner in 1789 from kyanos, the Greek word for blue. The mineral was called "cyanite" by mineralogists, using the French spelling, during most the 19th and early 20th centuries, though it can also be black (as these), white, and various shades of yellow, green and pink. It is mined at a small number of sites as an industrial mineral, used in the production of refractory materials, the ceramics designed to withstand very high temperatures in excess of 1,000˚F. Refractories are essential in the manufacture of petrochemicals and refining of gasoline. Making multiple purchases? Just add items to your cart. When finished shopping, click on "view cart" and then click on “request combined shipping” at upper right in the Shopping Cart window. Do not proceed to checkout. We will send an eBay invoice with the correct combined shipping. Select a specimen: When more than one specimen is shown, you can select a particular specimen by telling us what is in the photo with it - a black mechanical pencil, a silver and black pen, or one of those plus some number of coins, or you can let us make the selection. Shipping: Priority Mail or Ground Advantage, whichever is cheaper, unless we can find a better rate. Rates vary by weight and zip code. We can ship for less than eBay will charge, and will refund the overpayment as soon as the box is packed. We sell and ship internationally. If eBay’s page does not let you enter your country name to determine the shipping cost for something you are interested in, please contact us. We can tell you what the shipping would cost and how to make the purchase. You can then decide if you wish to complete the transaction. Use the Contact Seller link in the Seller Information box on the right side of this page. Pay securely with your debit or credit card through PayPal! You do not need a Pay Pal account to do this. Yes, we do combine shipping!
Price: 10.45 USD
Location: Olancha, California
End Time: 2024-11-25T11:31:50.000Z
Shipping Cost: N/A USD
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Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
