Mineralpedia Details for Yofortierite

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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)₂·8-9H₂O 

Crystal System

Monoclinic 

Crystal Habit

Radial, Acicular 

Color

violet brown, light violet, pink 

Streak

light pink 

Class

Monoclinic - Domatic 

Fracture

Elastic 

Hardness

2.5 

WebMineral

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Mindat

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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".