metamorphic
Thulite in Matrix
Pink Zoisite - Ca2Al3(SiO4)3(OH)
Hardness: 6-7 (Mohs); Color: Pink to rosy red (due to manganese) in a grey or white matrix; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 3.10 – 3.38
- Hardness
- 6-7 (Mohs)
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Mohs); Color: Pink to rosy red (due to manganese) in a grey or white matrix; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 3.10 – 3.38
Formation & geological history
Forms in regional metamorphic environments during the alteration of calcium-rich rocks. It is a pink variety of the mineral zoisite, typically found in manganese-rich hydrothermal veins. Rocks containing it are often hundreds of millions of years old.
Uses & applications
Primarily used as a lapidary material for cabochons, carvings, and as a collector's specimen. It is the national stone of Norway.
Geological facts
Thulite was first discovered in Norway in 1820 and named after the mythical island of Thule. Its distinct pink color is caused by the replacement of aluminum with manganese ions in the crystal lattice.
Field identification & locations
Look for pink to deep rose-red streaks or patches within a grey or greenish-grey rock matrix. It is harder than marble and won't bubble with acid. Common locations include Norway, Namibia, and the United States (North Carolina and Washington State).
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