Geographic Minerals

Nepheline: Properties and Occurrences

Nepheline: Properties and Occurrences

Nepheline is an important feldspathoid mineral. It also called nephelite, is a rock-forming mineral in the feldspathoid group: a silica-undersaturated aluminosilicate, Na3KAl4Si4O16, that occurs in intrusive and volcanic rocks with low silica, and in their associated pegmatites. It is the charact.....

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Nenadkevichite: Properties and Occurrences

Nenadkevichite: Properties and Occurrences

Nenadkevichite is an orthorhombic hydrated silicate of sodium, calcium, niobium, and titanium, which occurs as pale yellow crystals. It is a rare silicate mineral containing niobium with the formula: (Na, Ca) (Nb, Ti)Si2O7·2H2O. It was named in honor of Konstantin Avtonomovich Nenadkevich who wa.....

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Nelenite: Properties and Occurrences

Nelenite: Properties and Occurrences

Nelenite is a rare manganese iron phyllosilicate arsenate mineral found in Franklin Furnace, New Jersey. It is a trigonal-hexagonal scalenohedral brown mineral containing arsenic, hydrogen, iron, magnesium, manganese, oxygen, silicon, and zinc. Its formula is (Mn,Fe)16As3Si12O36(OH)17 or (Mn,Fe)1.....

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Auricupride – a natural alloy

Auricupride – a natural alloy

Auricupride is a natural alloy that combines copper and gold. Its chemical formula is Cu3Au. It is named after its chemical composition, being a natural alloy of Gold and Copper. The coexistence of Au and Pt is highly uncommon and has not been observed in other species. It’s a mineral that was .....

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Schreibersite – a rare iron-nickel phosphide mineral

Schreibersite – a rare iron-nickel phosphide mineral

Schreibersite is a mineral consisting of a phosphide of iron and nickel and occurring in meteorites. It is generally a rare iron-nickel phosphide mineral, (Fe, Ni)3P, though common in iron-nickel meteorites. The mineral schreibersite provides a reactive source of phosphorus capable of forming pho.....

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Allabogdanite – a very rare phosphide mineral

Allabogdanite – a very rare phosphide mineral

Allabogdanite is a very rare phosphide mineral with the formula (Fe, Ni)2P, found in 1994 in a meteorite. It is the only known natural high-pressure phase reported in the Fe–Ni–P system. It is an orthorhombic-dipyramidal light straw yellow mineral containing cobalt, iron, nickel, and phosphor.....

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Nekrasovite: properties and occurrences

Nekrasovite: properties and occurrences

Nekrasovite is a rare copper vanadium sulfosalt mineral with formula Cu26V2(Sn,As,Sb)6S32. It is an isometric-hextetrahedral reddish brown mineral containing antimony, arsenic, copper, iron, sulfur, tin, vanadium, and zinc. It is a rare copper vanadium sulfosalt mineral with formula isometric sys.....

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Spherulite (Structure, Occurrence)

Spherulite (Structure, Occurrence)

Spherulites (/ˈsfɛrʊlaɪt/) are spherical bodies that can be found in glassy rocks, especially silica-rich rhyolites. They appear as globules about the size of millet seed or rice grain in specimens of obsidian, pitchstone, and rhyolite, with a duller luster than the surrounding glassy base of.....

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Natrophilite: Properties and Occurrences

Natrophilite: Properties and Occurrences

Natrophilite is a mineral with the chemical formula NaMnPO4. It is a mineral consisting of phosphate of sodium and manganese almost isostructural with varulite but having sodium and manganese disordered. It is an orthorhombic-dipyramidal yellow mineral containing manganese, oxygen, phosphorus, an.....

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Natron: Properties and Occurrences

Natron: Properties and Occurrences

Natron is a mineral of hydrous sodium carbonate, often found crystallized with other salts. It is a naturally occurring mixture of sodium carbonate decahydrate (Na2CO3·10H2O, a kind of soda ash) and around 17% sodium bicarbonate (also called baking soda, NaHCO3) along with small quantities of so.....

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Natrolite: Properties and Occurrences

Natrolite: Properties and Occurrences

Natrolite is a tectosilicate mineral species belonging to the zeolite group. It is a common member of the zeolite group and is known for its needle-like crystal habits. It is hydrated sodium and aluminum silicate with the formula Na2Al2Si3O10•2H2O. It can be pale pink, colorless, white, red, gr.....

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Native Copper: Properties and Occurrences

Native Copper: Properties and Occurrences

Native copper is an element and a mineral. It is an uncombined form of copper that occurs as a natural mineral. It is rarely found in large quantities, thus it is seldom the primary target of a mining operation. Copper is one of the few metallic elements to occur in native form, although it most .....

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