American Mineralogist's Image Gallery

Matioliite: NaMgAl5(PO4)4(OH)6·2H2O

Comments: fiberous, blueish, matioliite aggregate on quartz.
Location: Gentil mine, Mendes Pimentel, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Matioliite: NaMgAl5(PO4)4(OH)6·2H2O

Comments: fiberous, blueish, matioliite aggregate on quartz.
Location: Gentil mine, Mendes Pimentel, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Matsubaraite: Sr4TiTi4Si4O22

Comments: Minute, dark grains of matsubaraite in a very pale green jadeite matrix.
Location: Itoigawa-Ohmi, Niigata Prefecture, Japan. Scale: Picture size 1 cm.
© American Mineralogist

Matsubaraite: Sr4TiTi4Si4O22

Comments: Minute, dark grains of matsubaraite in a very pale green jadeite matrix.
Location: Itoigawa-Ohmi, Niigata Prefecture, Japan. Scale: Picture size 1 cm.
© American Mineralogist

Mazzite-Na: Na8Al8Si28O72·30H2O

Comments: Silky mazzite-Na fibers filling a cavity in basalt.
Location: Open pit of the U.S. Borax mine at Boron, California. Scale: Specimen size 5 mm.
© American Mineralogist

Mazzite-Na: Na8Al8Si28O72·30H2O

Comments: Silky mazzite-Na fibers filling a cavity in basalt.
Location: Open pit of the U.S. Borax mine at Boron, California. Scale: Specimen size 5 mm.
© American Mineralogist

Medenbachite: Bi2Fe+++(Cu,Fe+++)(O,OH)2(OH)2(AsO4)2

Comments: SEM image of tabular plates of mendenbachite crystals. (AmMin, v81:505).
Location: Silicified barite vein from Reichenbach near Bensheim, Odenwald, Hesse, Germany. Scale: Scale Bar 20 µm.
© American Mineralogist

Medenbachite: Bi2Fe+++(Cu,Fe+++)(O,OH)2(OH)2(AsO4)2

Comments: SEM image of tabular plates of mendenbachite crystals. (AmMin, v81:505).
Location: Silicified barite vein from Reichenbach near Bensheim, Odenwald, Hesse, Germany. Scale: Scale Bar 20 µm.
© American Mineralogist

Melliniite: (Ni,Fe)4P  
Kamacite: alpha-(Fe,Ni)

Comments: Reflected-light image displaying an anhedral fragment of creamy-yellowish melliniite(1) associated with kamacite (2). AmMin, v91, p453.
Location: Northwest Africa 1054 acapulcoite. Scale: See Image.
© American Mineralogist

Melliniite: (Ni,Fe)4P  
Kamacite: alpha-(Fe,Ni)

Comments: Reflected-light image displaying an anhedral fragment of creamy-yellowish melliniite(1) associated with kamacite (2). AmMin, v91, p453.
Location: Northwest Africa 1054 acapulcoite. Scale: See Image.
© American Mineralogist

Melliniite: (Ni,Fe)4P  
Nickelphosphide: (Ni,Fe)3P

Comments: Reflected light image of creamy-yellowish melliniite (1) and nickelphosphide (3). AmMin, v91, p453.
Location: Northwest Africa 1054 acapulcoite. Scale: See Image.
© American Mineralogist

Melliniite: (Ni,Fe)4P  
Nickelphosphide: (Ni,Fe)3P

Comments: Reflected light image of creamy-yellowish melliniite (1) and nickelphosphide (3). AmMin, v91, p453.
Location: Northwest Africa 1054 acapulcoite. Scale: See Image.
© American Mineralogist

Menezesite: Ba2MgZr4(BaNb12O42)·12H2O

Comments: Brownish-red rhombododecahedral crystals of menezesite over calcite (with tiny black tochilinite inclusions). AmMin v93:82.
Location: Jacupiranga mine, in Cajati county, São Paulo state, Brazil. Scale: Crystal size 0.5 mm.
© American Mineralogist

Menezesite: Ba2MgZr4(BaNb12O42)·12H2O

Comments: Brownish-red rhombododecahedral crystals of menezesite over calcite (with tiny black tochilinite inclusions). AmMin v93:82.
Location: Jacupiranga mine, in Cajati county, São Paulo state, Brazil. Scale: Crystal size 0.5 mm.
© American Mineralogist

Meridianiite: MgSO4·11H2O

Comments: Red arrow points meridianiite on the underside of a post in a frozen pond. Ice, in the form of snow covers the top of the post and the frozen pond surface (AmMin, v92:1757). This in an analoge for probable Martian occurrences.
Location: The ponds are on the Basque claims, which occur in a small valley in the Thompson region of central British Columbia. Scale: See Image.
© American Mineralogist

Meridianiite: MgSO4·11H2O

Comments: Red arrow points meridianiite on the underside of a post in a frozen pond. Ice, in the form of snow covers the top of the post and the frozen pond surface (AmMin, v92:1757). This in an analoge for probable Martian occurrences.
Location: The ponds are on the Basque claims, which occur in a small valley in the Thompson region of central British Columbia. Scale: See Image.
© American Mineralogist

Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

Comments: B&W image of sprays of meurigite-Na with turquoise, intergrown kidwellite/lipscombite, and crandallite on goethite. (AmMin, v94:720).
Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: Largest Spray = 1 mm.
© American Mineralogist

Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

Comments: SEM image of meurigite-Na crystals. (AmMin, v94:720).
Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: See Image.
© American Mineralogist

Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

Comments: B&W image of sprays of meurigite-Na with turquoise, intergrown kidwellite/lipscombite, and crandallite on goethite. (AmMin, v94:720).
Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: Largest Spray = 1 mm.
© American Mineralogist

Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

Comments: SEM image of meurigite-Na crystals. (AmMin, v94:720).
Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: See Image.
© American Mineralogist