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| A hard, brittle, silvery metal that heads group 7. It is widely used in making special steels.
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Electrowinning plate under argon.
This material is a layer of manganese plated out onto an electrode in the purification process known as electrowinning. Manganese reacts with air to form an ugly black coating, which has been carefully cleaned off these pieces before they were sealed in this argon-purged glass ampoule for safe keeping.
Source: Scrap yard
Size: 1/2"
Purity: 99.9%
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Battery.
Manganese has long been used in battery manufacture. Before the advent of the now ubiquitous alkaline batteries, the standard design was the "dry cell" based on carbon and zinc electrodes in a manganese dioxide electrolyte. This battery is a more modern variant using manganese and lithium. It is able to provide a low current for extended periods and is typically used for powering clocks. [CHECK]
Source: donated
Size: length 3 inches
Purity: n/a
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Manganese nodule.
Nodules like this one are brought up from deep ocean floors. At one time there was great excitement about the commercial potential of mining manganese nodules, but it turns out that the story of their potential was fabricated as a cover to explain why a large American deep-ocean retrieval vessel was sent to poke around in an area where a Soviet submarine had sunk earlier.
Source: Mackay mineral collection
Size: 1"
Purity: <30%
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Purpurite.
Purpurite, derived from the Latin purpureus (purple red), occurs in a range of colors from brownish black through red but as a mineral specimen is most commonly encountered in its purple or violet forms. It is opaque with an earthy lustre and is only found in the massive state, usually associated with other phosphates.
Source: Mackay mineral collection
Size: 2"
Purity: 36%
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