American Mineralogist's Image Gallery

Cianciulliite: Mn++++(Mg,Mn++)2Zn2(OH)10·2-4(H2O)

Comments: SEM image of a typical cianciulliite crystals. The abundant incipient cleavage is very obvious. (AmMin, v76:1708).
Location: Franklin, New Jersey, USA. Scale: Field of view is 0.3 mm.
© American Mineralogist

Cianciulliite: Mn++++(Mg,Mn++)2Zn2(OH)10·2-4(H2O)

Comments: SEM image of a typical cianciulliite crystals. The abundant incipient cleavage is very obvious. (AmMin, v76:1708).
Location: Franklin, New Jersey, USA. Scale: Field of view is 0.3 mm.
© American Mineralogist

Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)

Comments: Boulder consisting of prehenite, diaspore, chlorite and niigataite. The pale lavender is prehenite/diaspore and the very pale green is chlorite/niigataite..
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Specimen size 19cm x 16 cm.
© American Mineralogist

Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)

Comments: Backscatter electronic image of niigataite (bright) which is partially replacing a chlorite (med gray) grain in a diaspore (dark gray, rod-shaped) and prehenite (light gray) matrix.
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Picture size 5 mm.
© American Mineralogist

Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)

Comments: Boulder consisting of prehenite, diaspore, chlorite and niigataite. The pale lavender is prehenite/diaspore and the very pale green is chlorite/niigataite..
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Specimen size 19cm x 16 cm.
© American Mineralogist

Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)

Comments: Backscatter electronic image of niigataite (bright) which is partially replacing a chlorite (med gray) grain in a diaspore (dark gray, rod-shaped) and prehenite (light gray) matrix.
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Picture size 5 mm.
© American Mineralogist

Coquimbite: Fe+++2(SO4)3·9(H2O)

Comments: Coquimbite rosettes (small bumps) secondarily nucleated on a cryptocrystalline mass. AmMin, v90, p1734.
Location: Vents associated with underground coal fires in the Wuda coal bed of Inner Mongolia. Scale: See Image.
© American Mineralogist

Coquimbite: Fe+++2(SO4)3·9(H2O)

Comments: Coquimbite rosettes (small bumps) secondarily nucleated on a cryptocrystalline mass. AmMin, v90, p1734.
Location: Vents associated with underground coal fires in the Wuda coal bed of Inner Mongolia. Scale: See Image.
© American Mineralogist

Costibite: CoSbS

Comments: B&W polished section image of ullmannite-willyamite zoned crystal (Ul-Wi) surrounded by lollingite (Lol) containing lamellae of costibite (Co) in a siderite (Sid) matrix. AmMin v55:10.
Location: Consols Mine, Broken Hill, New South Wales, Australia. Scale: See Image.
© American Mineralogist

Costibite: CoSbS

Comments: B&W polished section image of ullmannite-willyamite zoned crystal (Ul-Wi) surrounded by lollingite (Lol) containing lamellae of costibite (Co) in a siderite (Sid) matrix. AmMin v55:10.
Location: Consols Mine, Broken Hill, New South Wales, Australia. Scale: See Image.
© American Mineralogist

Coulsonite: Fe++V+++2O4

Comments: Evenly disseminated fine-grained coulsonite in subhedral crystals (light gray) scattered through silicate gangue (dark gray), composed of chlorite, muscovite and scapolite. (AmMin, v47:1284).
Location: Metamorphosed igneous rocks of the Buena Vista Hills located some twenty miles southeast of the town of Lovelock, Nevada, USA. Scale: Picture Size 135 x.
© American Mineralogist

Coulsonite: Fe++V+++2O4

Comments: Evenly disseminated fine-grained coulsonite in subhedral crystals (light gray) scattered through silicate gangue (dark gray), composed of chlorite, muscovite and scapolite. (AmMin, v47:1284).
Location: Metamorphosed igneous rocks of the Buena Vista Hills located some twenty miles southeast of the town of Lovelock, Nevada, USA. Scale: Picture Size 135 x.
© American Mineralogist

Coutinhoite: ThxBa1-2x(H2O)y(UO2)2Si5O13·H2O

Comments: Irregular aggregate of yellow coutinhoite. (AmMin, v 89, p 721).
Location: Urucum mine, Galiléia, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Coutinhoite: ThxBa1-2x(H2O)y(UO2)2Si5O13·H2O

Comments: Irregular aggregate of yellow coutinhoite. (AmMin, v 89, p 721).
Location: Urucum mine, Galiléia, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Coyoteite: NaFe3S5·2(H2O)

Comments: Black and white image of a polished section showing coyoteite crystals showing chevron pattern developed by opposing cleavage sets. Continuous parallel lines are polishing scratches. (AmMin 68:252).
Location: Coyote Peak mafic alkalic diatreme near Orick, Humboldt County, California. USA. Scale: Image size 0.26 mm.
© American Mineralogist

Coyoteite: NaFe3S5·2(H2O)

Comments: Black and white image of a polished section showing coyoteite crystals showing chevron pattern developed by opposing cleavage sets. Continuous parallel lines are polishing scratches. (AmMin 68:252).
Location: Coyote Peak mafic alkalic diatreme near Orick, Humboldt County, California. USA. Scale: Image size 0.26 mm.
© American Mineralogist

Danielsite: (Cu,Ag)14HgS8

Comments: BSE image showing danielsite (D - light gray) and stromeyerite (S - slightly darker) occupy the center of the triangular area and are surrounded by chalcocite (C - black).The anglesite (A) is white.
Location: Pocket of primary sulfides in a quartz vein near Coppin Pool, Western Australia. (AmMin, v72:401). Scale: See Image.
© American Mineralogist

Danielsite: (Cu,Ag)14HgS8

Comments: BSE image showing danielsite (D - light gray) and stromeyerite (S - slightly darker) occupy the center of the triangular area and are surrounded by chalcocite (C - black).The anglesite (A) is white.
Location: Pocket of primary sulfides in a quartz vein near Coppin Pool, Western Australia. (AmMin, v72:401). Scale: See Image.
© American Mineralogist

Davanite: K2TiSi6O15

Comments: B&W plane-polarized light (PPL) image of davanite crystals, with a hexagonal outline, in a Sr-Ca carbonate matrix. (AmMin, v71:1473).
Location: Lamproites at Smoky Butte, Montana, USA. Scale: Scale Bar 20 µm.
© American Mineralogist

Davanite: K2TiSi6O15

Comments: B&W plane-polarized light (PPL) image of davanite crystals, with a hexagonal outline, in a Sr-Ca carbonate matrix. (AmMin, v71:1473).
Location: Lamproites at Smoky Butte, Montana, USA. Scale: Scale Bar 20 µm.
© American Mineralogist