Specimens of Biotite Muscovite Granite collected from St. Austell in Cornwall, UK. This granite is part of the Cornubian batholith and dates to the Permian period around 280 million years ago. Specimens are available in multiple sizes and comes in a white card tray with an information label. We also supply Biotite Muscovite Granite thin sections for microscope study which are available to buy HERE.
