M minerals

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Magnetite

from various origins.

A magnetic iron oxide.

Chemistry : Fe+2 Fe2+3O4
System : Cubic

Malachite

from various origins

Carbonate from copper deposits.

Chemistry : Cu2CO3(OH)2
System : Monoclinic

Manganoan vesuvianite

from Jeffrey Mine, Canada.
Mineral from sedimentary metamorphic rocks.

Chemistry : Ca10Mg2Al4 (SiO4)5(Si2O7)2(OH)
System : Tetragonal

Marcasite

from various origins.

Dimorph of pyrite from sedimentary rocks.

Chemistry : FeS2
System : Orthorhombic

Melanophlogite

A rare mineral made of silica and organic material.

Chemistry : 46(SiO2) 6(N2,CO2) 2(CH4,N2)
System : Tetragonal

Mica

from various origins.

Aluminous phyllosilicate.

Chemistry : XY3+2 [AlSi3O10(OH,F)2]7-
System : Monoclinic

Mimetite

from various origins

Mineral from oxidation areas of lead deposits.

Chemistry : Pb5(AsO4)3Cl
System : Hexagonal


Molybdenite

from various origins

Pneumatolytic or magmatic mineral.

Chemistry : MoS2
System : Hexagonal


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