Thomsonite Subgroup
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Physical & Optical Properties
Mohs Hardness
| Mohs | Reference mineral | Thomsonite Subgroup |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | ● |
| 6 | Orthoclase | |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Where to Buy Thomsonite Subgroup
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About Thomsonite Subgroup
The Thomsonite Subgroup consists of calcium sodium aluminosilicate zeolite minerals forming colorless, white, pink, or green radiate or columnar crystal masses with a silky to vitreous luster in basaltic cavities and hydrothermal veins. Thomsonite from the north shore of Lake Superior, Minnesota, USA, produces unique banded eye-like concentric patterns in pink, green, and white when polished as agates, making them distinctive collector stones. Notable specimens also come from Iceland and Greenland.