Mineralpedia Details for Lalondeite

Named in honor of Andre Lalonde, a professor in the Department of Earth Sciences at the University of Ottawa in Canada for his work in alkaline intrusions and mica schists. Lalondeite can be found only at its type locality in the Poudrette quarry at Mont Saint-Hilaire in Quebec, Canada where it occurs as a late-stage, low-temperature hydrothermal mineral. Lalondeite can have a medium to strong fluorescence of violet-blue under mid-range ultraviolet wavelengths.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/lalondeite.pdf

Formula

(Na,Ca)₆(Ca,Na)₃Si₁₆O₃₈(F,OH)₂·3H₂O 

Crystal System

Triclinic 

Crystal Habit

Irregular Grains, Subhedral Crystals 

Cleavage

Perfect, None, None 

Luster

Pearly 

Color

pink 

Streak

white 

Class

Triclinic - Pinacoidal 

Fracture

Brittle - Splintery 

Hardness

3 

WebMineral

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Mindat

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White rounded aggregate to about 0.5mm in vug.