Description: If making multiple purchases, please read the note that follow the red text below! Bituminous coal from a member of the Mancos Shale, Emery County, Utah - unit of 5 student specimens This bituminous coal is the lowest heating grade of bituminous coal. It has a shiny black surface, but not the conchoidal fracture of anthracite. Coal forms from the burial of accumulated plant material, in a series with increasing compaction from peak to lignite to bituminous coal and then anthracite. The first three are considered sedimentary. Anthracite is metamorphic, as it has undergone low-grade metamorphism, burning hotter than other coals and with a clean blue flame. The name anthracite was derived from the Greek word anthrax, the name given to it by the philosopher Theophrastus, a pupil of Aristotle. Bituminous coal was named under the mistaken impression that it contained bitumen, a group of hydrocarbons including tar and asphalt. This bituminous coal is from the Bronco Mine, Emery County, Utah, the former Emery Deep Mine. The coal is Upper Cretaceous in age, mined from the Ferron Sandstone member of the Mancos Shale. Its coal rank is high-volatile C bituminous, which means it has the lowest heat value of bituminous coals. This coal is low in sulfur.This mine is Utah's oldest producing coal mine, with mining beginning in 1881. Formerly owned by Consolidation Coal Company, it was idled in 1990, reopened in 2017 after the mine's purchase by Bronco. The mine currently accesses high quality coal through a mile long tunnel under federal land to leases on state and private land.We really don't like the tiny finger nail-sized specimens offered to students, as we feel these are too small to see rock textures and too small for examining the identifying characteristics of a mineral. We want the "Oh, Wow!" effect when students see the set of specimens they are going to work with. We collect these specimens so that five specimens, or possibly six, will fit in a small flat rate box, and we keep the price low, as we know these will be used in a classroom. For teachers we count like a baker where a dozen is more than 12, since you will always need a few spares. If you are a teacher, let us know. You are buying a unit of five student specimens. The photo is representative of what we ship 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. 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 usually ship for less than eBay will charge, and will refund the overpayment as soon as the box is packed. International customers: 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: 4.6 USD
Location: Olancha, California
End Time: 2024-08-12T02:47:42.000Z
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
