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Mineralpedia Details for Lorenzenite

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Lorenzenite

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
WebMineral
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Mindat
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Lorenzenite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Lorenzenite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Acicular, divergent sprays to 3mm. Not your typical habit for this mineral.

Click thumbnail images for larger view.

Lorenzenite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Lorenzenite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Extremely long crystals, 2.7cm long.

Click thumbnail images for larger view.

Lorenzenite from Kola Peninsula, Russia

Lorenzenite
            from Kola Peninsula, Russia

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

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