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Mineralpedia Details for Friedelite

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Friedelite

Friedelite

Named after Charles Friedel, a noted French chemist and mineralogist. Friedelite is found in metamorphosed Mn-Fe deposits in localities in France, Sweden, Kazakhstan, the United States, South Africa, Australia, and others. Associated minerals include rhodochrosite, albandite, franklinite, willemite, calcite, baryte, chlorite, sphalerite, kutnohorite, andradite, and hausmannite.

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

Formula
Mn2+8Si6O15(OH)10 
Crystal System
Monoclinic 
Crystal Habit
Massive, Tabular 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, brown red, yellow, light pink, dark red 
Streak
pink 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4-5 
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Friedelite from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Friedelite
            from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Peach colored micro crystals mostly less than 0.5mm but up to 1mm.

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Friedelite from Franklin, Sussex Co., New Jersey, United States

Friedelite
            from Franklin, Sussex Co., New Jersey, United States

Extensively rich specimen with thousands of pink micro crystals with characteristic triangular faces. Not fluorescent.

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Friedelite from N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa

Friedelite
            from N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa

Tiny deep red spherules, less than 0.5mm.

Click thumbnail images for larger view.

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