mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Mineralpedia Details for Lalondeite

Reset

Lalondeite

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)2ยท3H2
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
WebMineral
View Lalondeite 
Mindat
View Lalondeite 

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

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

White rounded aggregate to about 0.5mm in vug.

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2021 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map