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Mineralpedia Details for Manganite

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Manganite

Manganite

Formula
Mn3+O(OH) 
Crystal System
Monoclinic 
Crystal Habit
Pseudo Orthorhombic, Massive - Fibrous, Prismatic 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
black, gray, grayish black 
Streak
dark brown 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
WebMineral
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Mindat
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Manganite from Montreal mine, Iron Co., Wisconsin, United States

Manganite
            from Montreal mine, Iron Co., Wisconsin, United States

Crystalline aggregate composed of tightly packed, elongated Manganite crystals to 2.5cm.

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Manganite from Ilfeld, Harz, Germany

Manganite
            from Ilfeld, Harz, Germany
Special Info
Type Locality

An old time classic European locality, Ilfeld, Harz Mountains, Thuringia, Germany is most famous for it's highly lustrous Manganite crystals. Thomas Moore, authored the most recent work on Ilfeld in the Mineralogical Record (v. 41, n. 6). Ilfeld is a mining district which extended over two centuries between the 1700's and 1922. The Manganite from Ilfeld has yet to be surpassed in quality to this day. Numerous examples of Manganite illustrations have been figured by  Mohs and many others over the years.

This specimen shows incredible, highly reflective luster to which Ilfeld Manganites are famous for. The columnar, shiny black prismatic crystals of Manganite reach 2cm. Each crystal is terminated showing no damage except one crystal on the far side. Further, the terminations show several prismatic forms in combination with numerous parallel columns, which, I believe, classifies them as a type II crystal as described by Moore (pg. 495). This specimen comes with an old University of Chicago label dated 1963 stating that the donor was "English". I assume this to be the late, great George English. It has matching ID numbers on label to specimen.  If you were to have a classic in your collection from a famous region in Germany, as all upper end collectors have, this would be a specimen to purchase. Extra shipping applies.

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Manganite from Robert mine, Cuyuna Range, Crow Wing Co., Minnesota, United States

Manganite
            from Robert mine, Cuyuna Range, Crow Wing Co., Minnesota, United States

Highly lustrous black well-developed cyrstals of Manganite to 2mm from this historic mining district in upper Minnesota.

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Manganite from Philipsburg dist., Granite Co., Montana, United States

Manganite
            from Philipsburg dist., Granite Co., Montana, United States

This is a good ore specimen to have, since it originates from one of the (or largest), manganese deposits in the USA. The district was mined during World War II for manganese, but also carried Silver. The entire district is located directly behind and east of the historic western town of Philipsburg. 

Radiating silvery black crystals to 1.5cm. Personally by Dr. Albert Kidwell in 1962, and later obtained by Dr. Buford Nichols.

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