Melanophlogite

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Melanophlogite specimen - rock identification

What is Melanophlogite?

Melanophlogite (MEP) is a rare silicate mineral and a polymorph of silica (SiO2). It has a zeolite-like porous structure which results in relatively low and not well-defined values of its density and refractive index. Melanophlogite often overgrows crystals of sulfur or calcite and typically contains a few percent of organic and sulfur compounds. Darkening of organics in melanophlogite upon heating is a possible origin of its name, which comes from the Greek for "black" and "to be burned".

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Melanophlogite Localities Map

See where Melanophlogite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

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North ZoneCentral RidgeSouth Basin

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Key Characteristics

Formation of Melanophlogite

Melanophlogite is a rare mineral which usually forms round drops (see infobox) or complex intertwinned overgrowth structures over sulfur or calcite crystals. Rarely, it occurs as individual cubic crystallites a few millimeters in size. It is found in Parma, Torino, Caltanissetta and Livorno provinces of Italy; also in several mines of California in the US, in Crimea (Ukraine) and Pardubice Region (Czech Republic).

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Melanophlogite specimen 2
© Robert M. Lavinsky

Quick Facts

Physical Properties

Color
Colorless, white, water-clear (pale yellow to deep red brown with impurities)
Hardness (Mohs)
6.5 - 7
Streak
White

Chemical Properties

Chemical Formula
46SiO2 · 6(N2,CO2) · 2(CH4,N2)
Elements
C, H, N, O, Si
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