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Mineralpedia Details for Yofortierite

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Yofortierite

Yofortierite

Named for Yves Oscar Fortier, the former director of the Geological Survey of Canada from 1964 to 1972. Found most notably from Mont Saint-Hilaire in Canada and the Lovozero Massif in Russia, Yofortierite occurs as “a late-stage hydrothermal mineral in pegmatite veins” such as at Mont Saint-Hilaire.

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

Formula
Mn2+5Si8O20(OH)2ยท8-9H2
Crystal System
Monoclinic 
Crystal Habit
Radial, Acicular 
Color
violet brown, light violet, pink 
Streak
light pink 
Class
Monoclinic - Domatic 
Fracture
Elastic 
Hardness
2.5 
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Yofortierite from Pegmatite #61, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia

Yofortierite
            from Pegmatite #61, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia Originally mistaken for a Chlorite and was later found to be a member of the Palygorskite group. It forms brown altered platy rosettes. This rosette is 6mm across, much like the phot in Pekov's book "Lovozero Massif".
Click thumbnail images for larger view.

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