Rock gypsum thin section slide exhibiting a range of textbook gypsum petrographic features. This mineral is colourless in thin section, crystals are generally prismatic or tabular but some fibrous and acicular forms can be identified as seen in the example pictures. Typically gypsum is an evaporite deposit forming in lake & sea water but also from hot springs associated with volcanic activity. This particular material originates from Triassic deposits in Nottinghamshire, U.K. The slides are 30 microns thick and measure 46 x 27 mm in size and have a cover slip of the section along with a protective cardboard sleeve.
