6.9" Thunder Bay Amethyst Cluster - Ontario

This is a large, 6.9" wide cluster of amethyst crystals that are associated with a small amount of bladed 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.

The base has been cut flat, allowing for aesthetic presentation of the specimen without the need for a display stand. When viewing the cut base, there are spots of grey metallic luster which can be attributed to the formation of galena.

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.
Quartz var. Amethyst with Barite
Boulder Creek Amethyst Mine, Thunder Bay, Ontario
6.9" wide, 4.3" tall. Just under 4 lbs