Geographic Minerals

Melonite is a nickel telluride mineral. It is a telluride of nickel; it is a metallic mineral. A nickel telluride which occurs in reddish-white granular…

Petit Granit is a rather compact natural calcareous stone with a natural grey-blue color; it is a Lower Carboniferous (Tournaisian) grey-bluish crinoidal calcareous stone which,…

Mellite is a rare and unusual organic gemstone. It forms an association with lignite (brown coal) from compressed decayed plant matter and aluminum. It is…

Melilite refers to a mineral of the melilite group. It is a mineral consisting of a solid solution of gehlenite and akermanite. It has a…

Melanterite is a mineral form of hydrous iron(II) sulfate: FeSO4·7H2O. It is a widespread green, a mostly fibrous mineral composed of hydrated ferrous sulfate. It is…

Melanophlogite is a rare silicate mineral and a polymorph of silica (SiO2). It is a rare form of silica, and is in a unique class in…

Soil is that the uppermost layer of Earth’s crust, formed by the continual weathering of mountains over thousands of years. It’s made from four basic…

Meionite is the calcium-rich end member of the Scapolite series. It is a tectosilicate belonging to the scapolite group with the formula Ca4Al6Si6O24CO3. It is…

Mckelveyite-(Y) is hydrated sodium, barium, yttrium, and uranium–containing carbonate mineral, with the chemical formula Ba3Na(Ca, U)Y(CO3)6·3H2O. It was first described in 1965 from deposits in the Green River Formation, Sweetwater County, Wyoming,…

Maskelynite is a glassy material found in some meteorites and meteorite impact craters. It is a type of naturally occurring glass having the composition of…

Mawsonite is a brownish-orange sulfosalt mineral, containing copper, iron, tin, and sulfur: Cu6Fe2SnS8. It is a tetragonal sulphide of copper, tin, and iron, which is typically…

Maucherite is a grey to reddish silver-white nickel arsenide mineral. It is a tetragonal nickel arsenide, occurring as brittle, opaque, reddish-grey crystals which have a…