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Matte

An initial refinement of ore produced at a smelter, usually a mix of metal and sulphur, ideal for transportation but requiring further refinement.

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Matrix

A term synonymous with host rock, country rock and gangue rock. The non-target rock surrounding the target mineral

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Mass

The measurement of total quantity of matter

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Marl

A term applied to a variety of minerals which occur as loose mixtures of clay, calcium carbonate, and carbon based materials in various stages of decomposition. It is frequently found in a hydrous state in subterraneous deposits. It is used for fertilizer and also in the beauty industry for its exfoliative properties

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Mica

A group of phyllosilicate minerals with perfect basal cleavage and often occur in “books” or multiple flexible “leafs”. Found in various states in all rock types and includes the minerals anandite, annite, biotite, bityite, celadonite, chernykhite, clintonite, ephesite, ferri-annite, glauconite, hendricksite, kinoshitalite, lepidolite, margarite, masutomilite, montdorite, muscovite, nanpingite, norrishite, paragonite, phlogopite, polylithionite, preiswerkite, roscoelite, siderophyllite, sodium phlogopite, taeniolite, tobelite, wonesite, and zinnwaldite

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Monazite

A yellow to brown monoclinic mineral, (Ce,La,Y,Th)PO4; an ore of radioactive or rare earth elements

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Meteorite

A meteor that has fallen to Earth which has resisted disintegration in the Earth’s atmosphere. Meteorites are either stone, iron, or a mixture of both which frequently contain other elements including nickel platinum, iridium