American Mineralogist's Image Gallery

Minasgeraisite-(Y): CaY2Be2Si2O10

Comments: SEM image of spherical aggregate of growth-zoned minasgeraisite crystals showing elongation along a and simple pedion termination. (AmMin, v71:603).
Location: Lawa de Sr. Jose Pinto pegmatite body, Jaguaracu, Municipo de Timoteo, Minas Gerais, Brazil. Scale: Tick Marks 10 µm.
© American Mineralogist

Minasgeraisite-(Y): CaY2Be2Si2O10

Comments: SEM image of spherical aggregate of growth-zoned minasgeraisite crystals showing elongation along a and simple pedion termination. (AmMin, v71:603).
Location: Lawa de Sr. Jose Pinto pegmatite body, Jaguaracu, Municipo de Timoteo, Minas Gerais, Brazil. Scale: Tick Marks 10 µm.
© American Mineralogist

Moissanite: SiC

Comments: Gemmy, platy crystal of moissanite shown with largest (001) face. The arrow indicates a drop-shaped, black metallic inclusion. (AmMin, 88:1818).
Location: Found in a cobble at a beach along the Turkish coast of the Mediterranean Sea, around 150 km NW from Izmir, and is most likely derived from Tertiary volcanic rocks outcropping in the area. Scale: Scale bar 300 µ-m.
© American Mineralogist

Moissanite: SiC

Comments: Gemmy, platy crystal of moissanite shown with largest (001) face. The arrow indicates a drop-shaped, black metallic inclusion. (AmMin, 88:1818).
Location: Found in a cobble at a beach along the Turkish coast of the Mediterranean Sea, around 150 km NW from Izmir, and is most likely derived from Tertiary volcanic rocks outcropping in the area. Scale: Scale bar 300 µ-m.
© American Mineralogist

Murataite: (Y,Na)6(Zn,Fe+++)5(Ti,Nb)12O29(O,F)14

Comments: Murataite (M) crystal in polished section showing cubic, form against quartz (Q). Other minerals are astrophyllite (A) and mineral Y (Y). (AmMin, v59:172).
Location: Small pegmatite in the St. Peters Dome area, El Paso County, Colorado, USA. Scale: See Image.
© American Mineralogist

Murataite: (Y,Na)6(Zn,Fe+++)5(Ti,Nb)12O29(O,F)14

Comments: Murataite (M) crystal in polished section showing cubic, form against quartz (Q). Other minerals are astrophyllite (A) and mineral Y (Y). (AmMin, v59:172).
Location: Small pegmatite in the St. Peters Dome area, El Paso County, Colorado, USA. Scale: See Image.
© American Mineralogist

Muthmannite: AgAuTe2

Comments: Backscattered scanning electron microphotograph of muthmannite (light gray) rimming a sylvanite (dark gray) grain. (AmMin 89:1506).
Location: Museum specimen from a gold-telluride deposit of Sacarîmb, Metaliferi Mountains, western Romania.. Scale: See Image.
© American Mineralogist

Muthmannite: AgAuTe2

Comments: Backscattered scanning electron microphotograph of muthmannite (light gray) rimming a sylvanite (dark gray) grain. (AmMin 89:1506).
Location: Museum specimen from a gold-telluride deposit of Sacarîmb, Metaliferi Mountains, western Romania.. Scale: See Image.
© American Mineralogist

Mutnovskite: Pb2AsS3(I,Cl,Br)

Comments: SEM of blocky crystals of mutnovskite. Needle-like crystals of unknown Pb-Bi-As halogensulfosalts, currently under study, appear on the left. AmMin, v91, p22.
Location: Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. Scale: See Image.
© American Mineralogist

Mutnovskite: Pb2AsS3(I,Cl,Br)

Comments: SEM of blocky crystals of mutnovskite. Needle-like crystals of unknown Pb-Bi-As halogensulfosalts, currently under study, appear on the left. AmMin, v91, p22.
Location: Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. Scale: See Image.
© American Mineralogist

Nchwaningite: Mn++2SiO3(OH)2·(H2O)

Comments: SEM image of acicular, platy nchwaningite crystals. (AmMin, v80:377).
Location: N'chwaning mine, Kalahari manganesefi eld, South Africa. Scale: See Image.
© American Mineralogist

Nchwaningite: Mn++2SiO3(OH)2·(H2O)

Comments: SEM image of acicular, platy nchwaningite crystals. (AmMin, v80:377).
Location: N'chwaning mine, Kalahari manganesefi eld, South Africa. Scale: See Image.
© American Mineralogist

Nesquehonite: Mg(HCO3)(OH)·2(H2O)

Comments: Scanning electron micrographs of nesquehonite clusters showing the typical elongated habit. (AmMin, 88:1882).
Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale Bar 50 µ-m (lower left).
© American Mineralogist

Nesquehonite: Mg(HCO3)(OH)·2(H2O)

Comments: Scanning electron micrographs of nesquehonite clusters showing the typical elongated habit. (AmMin, 88:1882).
Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale Bar 50 µ-m (lower left).
© American Mineralogist

Neustadtelite: Bi2Fe+++(Fe+++,Co)(O,OH)2(OH)2(AsO4)2

Comments: Scanning electron microscope micrograph of neustadtelite. (AmMin 87:728).
Location: Mine dumps of the Güldener Falk mine near Schneeberg-Neustädtel, Saxony, Germany. Scale: Scale Bar 15 µm.
© American Mineralogist

Neustadtelite: Bi2Fe+++(Fe+++,Co)(O,OH)2(OH)2(AsO4)2

Comments: Scanning electron microscope micrograph of neustadtelite. (AmMin 87:728).
Location: Mine dumps of the Güldener Falk mine near Schneeberg-Neustädtel, Saxony, Germany. Scale: Scale Bar 15 µm.
© American Mineralogist

Norrishite: K(Mn+++2Li)Si4O10(O)2

Comments: Thin section photomicrograph showing norrishite (Nrs) associated with kornite (Krn), sugilite (Sgl), and Mn-rich pectolite (Pct) (AmMin 88:190).
Location: Silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa. Scale: Picture Size 2.4 mm.
© American Mineralogist

Norrishite: K(Mn+++2Li)Si4O10(O)2

Comments: Thin section photomicrograph showing norrishite (Nrs) associated with kornite (Krn), sugilite (Sgl), and Mn-rich pectolite (Pct) (AmMin 88:190).
Location: Silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa. Scale: Picture Size 2.4 mm.
© American Mineralogist

Norsethite: BaMg(CO3)2

Comments: B&W RL image of interlocking norsethite (light-grey, stained) and calcite (dark-grey, etched). Etched with sodium rhodizonate solution. (AmMin, v52:1770).
Location: Discoveredz inc-lead-coppedr eposita t Rosh Pinah, situated about 100 miles south-east of Aus in South West Africa. Scale: Magnification 85 X.
© American Mineralogist

Norsethite: BaMg(CO3)2

Comments: B&W RL image of interlocking norsethite (light-grey, stained) and calcite (dark-grey, etched). Etched with sodium rhodizonate solution. (AmMin, v52:1770).
Location: Discoveredz inc-lead-coppedr eposita t Rosh Pinah, situated about 100 miles south-east of Aus in South West Africa. Scale: Magnification 85 X.
© American Mineralogist