Dolomite microscope slide with extreme birefringence in XPL and varied relief in PPL. In PPL view some crystals may be brown as a result of weathering or iron stained due to the presence of iron oxides. Dolomite rock or 'dolostone' is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite, CaMg(CO3)2. Most dolostones formed as a magnesium replacement of limestone or lime mud prior to lithification. It is resistant to erosion & less soluble than limestone in weakly acidic groundwater.These slides are made from our own stock of dolomite which was collected from Clitheroe, Lancashire. The section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.