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Spelter

A merchantable, nearly pure refined zinc product

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Streak

The inherent characteristic of a minerals based on having sufficient hardness to strike and mark a mineral of lesser hardness

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Specimen

A general sample, or choice representation of a mineral substance, plant or animal

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Specific gravity

The weight of a measured volume of substance measured against another substance, such as water in the case of liquid and solid matter

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Supergene

Minerals deposited on or near surface by precipitation of descending solutions of genetically linked material