tuff - teaching hand/display specimen of a rhyolitic tuff with angular clasts of rocks ripped from the vent
This particular volcanic igneous rock, the Bishop tuff, is composed of volcanic ash and fragments of other igneous rocks and the mineral sanidine that were ejected from vents near Mammoth, California 700,000 years ago. Because the ash was very hot when it fell to earth, the ash and rock fragments were welded together.
Tuffs are light colored, usually shades of buff or gray, and since they are silica rich, they are not dense. The broken fragments or clasts (from the Greek klastos for broken in pieces) are characteristic of tuffs and make a tuff distinguishable from a rhyolite, the fine-grained lava that has the same composition as tuff.
Select a specimen: You can select a specimen by telling us what is in the photo with it, a blue or black and silver pen, a black mechanical pencil or one of those plus some number of coins, or you can let us make the selection.
Ships in a Regional Priority Mail box. There would be room in that box for other specimens at no increase in postage. Please request an invoice to avoid overpaying shipping, by clicking the "combine shipping" button in the cart. Click > Shipping < for shipping rates. Use back button to return to this page.
Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.