tuff - student specimens of copper-stained green tuff

Description: If you are making more than one purchase, please read the note following the red text below! Teaching student specimens of a copper-stained green clastic tuff - Unit of 5 specimensThis particular volcanic igneous rock is composed of volcanic ash and fragments of other igneous rocks (clasts) that were ejected from a volcanic vent and then welded together. Copper has stained it green. Tuffs are light colored, usually shades of buff or gray, and since they are silica rich, they are not dense. A green tuff is unusual. This one has the typical angular rock fragments that were ripped from the walls of the vent welded into the ash. A student should know these fragments as clasts, from the Greek klastos for broken in pieces, and should know they are characteristic of tuffs.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 and 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: 2025-01-14T05:48:57.000Z

Shipping Cost: N/A USD