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Lorenzenite

Named for Johannes Theodor Lorenzen who was a Danish mineralogist with an interest in minerals from Greenland where Lorenzenite finds its type locality in the Narssarssuk pegmatite. Lorenzenite is a an uncommon mineral that occurs in nepheline syenite and within the associated pegmatites and can be found in additional localities that include Russia, Norway, Canada, the United States, and on the Canary Islands, among others. Lorenzenite has a green cathodoluminescence and will fluoresce pale yellow or dull green in short-wave ultraviolet light.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/lorenzenite.pdf
- Formula
- Na2Ti2O3(Si2O6)
- Crystal System
- Orthorhombic
- Crystal Habit
- Acicular, Granular, Massive - Fibrous
- Cleavage
- Distinct, Distinct, None
- Luster
- Vitreous - Greasy
- Color
- brown, colorless, green, white, light blue
- Streak
- light brownish yellow
- Class
- Orthorhombic - Dipyramidal
- Fracture
- Brittle - Conchoidal
- Hardness
- 6
- WebMineral
- View Lorenzenite
- Mindat
- View Lorenzenite
Lorenzenite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Acicular, divergent sprays to 3mm. Not your typical habit for this mineral.
Lorenzenite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Extremely long crystals, 2.7cm long.
Lorenzenite from Kola Peninsula, Russia

Well formed thick brown Lorenzenite crystals to 1.5cm with long black Tourmaline needles embedded in matrix.