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Mineralpedia Details for Inesite

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Inesite

Inesite

Named after the Greek for “fibers,” ines, in reference to its common habit. Inesite is a late-stage mineral in hydrothermal manganese deposits, and it occurs in Germany, Sweden, Romania, Slovakia, South Africa, the United States, Australia, Japan, and a few other localities. Associated minerals include rhodochrosite, bementite, hausmannite, datolite, pectolite, apophyllite, ruizite, orientate, and quartz.

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

Formula
Ca2Mn2+7Si10O28(OH)2·5H2
Crystal System
Triclinic 
Crystal Habit
Radial, Massive - Fibrous, Spherical 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
brown, brown, pink, orange 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle - Uneven 
Hardness
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Inesite from Hale Creek mine, Trinity Co., California, United States

Inesite
            from Hale Creek mine, Trinity Co., California, United States

Crystals lining cavities from 3 to 6mm.

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Inesite from N'Chwaning mines, Kuruman, Northern Cape prov., South Africa

Inesite
            from N'Chwaning mines, Kuruman, Northern Cape prov., South Africa

Light pink slender prismatic Inesite crystals to 3mm with sharp terminations covering most of matrix.

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Inesite from Fengjiashan mine, Huangshi, Hubei, China

Inesite
            from Fengjiashan mine, Huangshi, Hubei, China

Light pink bladed crystals of Inesite to 6mm.

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Inesite from Zinc Corporation mine, Broken Hill, New South Wales, Australia

Inesite
            from Zinc Corporation mine, Broken Hill, New South Wales, Australia

Fans to 2cm of orange-pink prismatic Inesite embedded in Galena rich matrix.

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Inesite from Wessels mine, Hotazel, Kalahari Mn fields, Northern Cape Province, South Africa

Inesite
            from Wessels mine, Hotazel, Kalahari Mn fields, Northern Cape Province, South Africa

Plate of red Inesite crystals to 2mm covering matrix with a bit of colorless Aphophyllite. Label dated at 1961. Not quite as red as the digital photos turned out.

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Inesite from Långban, Filipstad, Värmland, Sweden

Inesite
            from Långban, Filipstad, Värmland, Sweden

Light reddish orange bladed crystals to 5mm.

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Inesite from Broken Hill, New South Wales, Australia

Inesite
            from Broken Hill, New South Wales, Australia

Reddish orange columnar crystals in groups to 1.7cm.

Dark red bladed Inesite in tighly packed plates.

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