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      A colour photo of the Thunder Bay Amethyst open pit mine (01)

      Variety of: Quartz, SiO2 Uses: Gemstones and ornamental stones Birthstone for: February Color: various shades of purple Index of refraction: 1.544-1.553 Birefringence: 0.009 Hardness: 7 Cleavage: none Crystal system: trigonal Pleochroic: no Amethyst is the purple variety of quartz and is a popular gemstone. If it were not for its …

      A vug showing large clay covered amethyst crystals., A vug is another name for geode - a nodular stone having a cavity lined with crystals.

      Photo showing large X1's amethyst crystals.

      Photo of blasting (O2) in 1972 at the Amethyst Mine Panorama.

      A photo of an open pit mine at Amethyst Mine Panorama

      Photo of a sample of malachite. August 1985.

      Large amethyst crystals

      Large clay-covered amethyst crystals, August 3,1992.

      Photo showing the site of the main office of the Thunder Bay Amethyst Mine, 1970.

      Shown here is a 1977 photo of an open mining pit at the Thunder Bay Amethyst Mine.

      Shown here is rock being hosed down to clear off the overburden, in preparation for rock sampling.

      Shown in this photo is open pit benching. Benching of a steep work face consists of narrow horizontal steps across the slope. The rock is exposed and then inspected. Open pit benching is used where slopes are sufficiently steep, water supply is available, and there is room for the dump …

      Shown here is one of the open pits of the Thunder Bay Amethyst Mine.

      An aerial view of Thunder Bay Amethyst Mine looking west.

      An aerial view of the Thunder Bay Amethyst Mine looking south, 1985.

      A photo showing the use of high pressure washing to expose can cut through overburden and clean bedrock.

      Early days of Amethyst Mine Panorama

      Photo showing a front-end loader in a pit at the Thunder Bay Amethyst Mine in the 1970's.

      Clearing the land for the future site of the Thunder Bay Amethyst Mine in the late 1960's.