This is a large, 10.6" wide cluster of amethyst crystals with barite, collected from the Boulder Creek Amethyst Mines near Thunder Bay, Ontario. Similar to other amethyst specimens from the Thunder Bay area, these amethyst crystals have red hematite inclusions, however they're not as pronounced as other specimens from this location.
Red-orange, bladed barite can be found in multiple locations around this specimen, including a large cluster on what could be considered the bottom of this specimen. This mineral cluster comes with a display stand to assist with preferred presentation.
In the 1950's amethyst deposits were discovered about 30 miles NE of Thunder Bay Ontario while building a road. Since the 1960's it has been mined in the area. The amethyst from Thunder Bay can range from light, delicate purples to almost black in color. One very distinctive characteristics of many Thunder Bay amethyst crystals is the the inclusion of red hematite (microscopic disks/spherules within the amethyst). These inclusions can cause crystals to have red highlights, zones or even appear completely red in color.
Amethyst is a purple variety of quartz (SiO2) and owes its violet color to natural irradiation, iron impurities, and the presence of trace elements, which result in complex crystal lattice substitutions. It’s considered a semi-precious gemstone, and just two centuries ago was considered to have a value on par with diamonds, sapphires and rubies.