Difference between revisions of "Thulite"
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== Description == | == Description == | ||
| − | A pale to deep pink translucent [[zoisite|zoisite]] stone in which manganese replaces up to 2 % of the calcium. Thulite was discovered near Telemark, Norway and named for Thule, an old name for Norway. It has been used as a gemstone | + | A pale to deep pink translucent [[zoisite|zoisite]] stone in which manganese replaces up to 2 % of the calcium. Thulite was discovered near Telemark, Norway and named for Thule, an old name for Norway. It is usually mottle with white, gray, or translucent regions of calcite and quartz. The stone has been used as a gemstone when polished as a cabochon. |
==Synonyms and Related terms== | ==Synonyms and Related terms== | ||
| − | zoisite; rosaline | + | zoisite; rosaline; unionite |
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
* Cleavage = perfect in one direction | * Cleavage = perfect in one direction | ||
| Line 12: | Line 12: | ||
* Fracture = conchoidal to uneven | * Fracture = conchoidal to uneven | ||
* Streak = white or gray | * Streak = white or gray | ||
| − | * Fluorescence = | + | * Fluorescence = may have fluorescence in SW due to calcite inclusions |
* Pleochroism = present; and possibly dichroism or trichroism depending on color | * Pleochroism = present; and possibly dichroism or trichroism depending on color | ||
| Line 34: | Line 34: | ||
* Wikipedia [https://en.wikipedia.org/wiki/Thulite Thulite] Accessed Dec 2022 | * Wikipedia [https://en.wikipedia.org/wiki/Thulite Thulite] Accessed Dec 2022 | ||
* Mineralogy Database: [http://www.webmineral.com/data/Zoisite.shtml Zoisite] | * Mineralogy Database: [http://www.webmineral.com/data/Zoisite.shtml Zoisite] | ||
| + | * Gemopedia: [https://www.gemstones.com/gemopedia/thulite Thulite] (Accessed Dec 2022) | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 13:22, 23 December 2022
Description
A pale to deep pink translucent Zoisite stone in which manganese replaces up to 2 % of the calcium. Thulite was discovered near Telemark, Norway and named for Thule, an old name for Norway. It is usually mottle with white, gray, or translucent regions of calcite and quartz. The stone has been used as a gemstone when polished as a cabochon.
Synonyms and Related terms
zoisite; rosaline; unionite
Physical and Chemical Properties
- Cleavage = perfect in one direction
- Luster = vitreous
- Fracture = conchoidal to uneven
- Streak = white or gray
- Fluorescence = may have fluorescence in SW due to calcite inclusions
- Pleochroism = present; and possibly dichroism or trichroism depending on color
| Mohs Hardness | 6.0 - 6.5 |
|---|---|
| Density | 3.1-3.4 g/ml |
| Refractive index | 1.691 - 1.700 |
| Birefringence | 0.006 - 0.018 |
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Wikipedia Thulite Accessed Dec 2022
- Mineralogy Database: Zoisite
- Gemopedia: Thulite (Accessed Dec 2022)