1 left

gypsum - pink rock gypsum from the Pliocene Quartermaster Formation, Armstrong County, Texas - unit of five student specimens

$ 4.20

gypsum   CaSO4 2H2O  

Pink rock gypsum from the Pliocene Quartermaster Formation, Palo Duro Canyon, Armstrong County, Texas.

Gypsum is primarily formed as a chemical precipitation in an evaporative environment. This gypsum was deposited in shallow evaporative flats during a series of Pliocene marine transgressions and regressions - times of alternating rise and fall of sea level. It is interbedded with the siltstones and mudstones of the Quartermaster Formation. 

Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with the least expensive shipping. A link in that invoice will bring you back to checkout, no hassle. 

Shipping: Priority Mail small flat rate box unless combined with other purchases. Click > Shipping < for shipping rates. Use back button to return to this page.