American Mineralogist's Image Gallery

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

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

Daubreelite: Fe++Cr2S4  
Schollhornite: Na0.3CrS2·(H2O)  
Caswellsilverite: NaCrS2

Comments: Polished section (PPL) of schiillhornite (Sh), coexisting with caswellsilverite (Cw), ferromagnesian alabandite (Ab) and daubreelite (Db). (AmMin, v70:638).
Location: Norton County (Kansas-Nebraska) enstatite achondrite meteorite. Scale: Scale bar is 0.08 mm.
© 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

Davisite: Ca(Sc,Ti+++,Mg,Ti++++)AlSiO6

Comments: BSE image of the davisite-containing refractory inclusion in a polished section (USNM 7555). (AmMin, v94:845).
Location: Allende meteorite. Scale: See Image.
© American Mineralogist

Dellaventuraite: NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2  
Aegirine-augite: (Ca,Na)(Mg,Fe++,Fe+++)[Si2O6]

Comments: View in plane-polarized light of reddish brown dellaventuraite (OPTK) as an overgrowth on purple-gray aegirine-augite (AE-AG) in a matrix of rounded quartz (QZ) with minor rounded (high relief) apatite grains. (AmMin 90:306).
Location: Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Scale: Picture size 2.5 cm.
© American Mineralogist

Demicheleite-(Br): BiSBr

Comments: (SEM) image (BSE) of demicheleite. (AmMin, v93:1603).
Location: La Fossa crater, Vulcano, Aeolian Islands, Italy. Scale: See Image.
© American Mineralogist

Dessauite: (Sr,Pb)(Y,U)(Ti,Fe+++)20O38

Comments: SEM photograph of tabular {001} dessauite crystals on calcite. (AmMin v82:807).
Location: Buca della Vena mine, Tuscany, Italy. Scale: Scale bar: 0 .1mm.
© American Mineralogist

Direnzoite: NaK6MgCa2(Al13Si47O120)·36H2O

Comments: A fragment of the original piece of xenolith that containes direnzoite specimen. AmMin v93:96.
Location: Massif Central (France). Scale: Sample size 4 cm.
© American Mineralogist

Direnzoite: NaK6MgCa2(Al13Si47O120)·36H2O

Comments: SEM micrograph of direnzoite showing the internal radial fiberous structure of the nodule. (AmMin, v93:97.
Location: Massif Central (France). Scale: See Image.
© American Mineralogist

Dissakisite-(La): (Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce

Comments: B&W macrophotograph of dissakisite-(La) from the as matrix constituents and Cr-rich spinel in a peridotite matrix. AmMin, v90 p 1178.
Location: Ulten zone, Eastern Alps, Italy. Scale: See Image.
© American Mineralogist

Dissakisite-(La): (Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce

Comments: B&W thin section image showing radial cracks from dissakisite-(La) (dik) propagating into the surrounding olivine (ol). AmMin, v90 p 1178.
Location: Ulten zone, Eastern Alps, Italy. Scale: See image.
© American Mineralogist

Dmitryivanovite: CaAl2O4

Comments: Inclusion consisting mainly of grossite (Gr) intergrown with perovskite (Pv) and melilite (Mel) that is pure gehlenite (Ak0) with dmitryivanovite (CaAl2O4). (AmMin, v94:746).
Location: Northwest Africa 470 (NWA470) CH3 chondrite. Scale: See Image.
© American Mineralogist

Dukeite: Bi+++24Cr++++++8O57(OH)6(H2O)3

Comments: SEM photomicrograph showing part of a dukeite sheave (AmMin, 85:1823).
Location: Found on a museum specimen labeled as originating from the São José Mine, Brejaúba, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Dumortierite: Al6.5-7(BO3)(SiO4)3(O,OH)3

Comments: Low-magnification, bright-field image showing dispersed dumortierite fibers extracted from rose quartz on a carbon film. (AmMin 87:270).
Location: Madagascar. Scale: See Image.
© American Mineralogist

Ellisite: Tl3AsS3

Comments: SEM image of ellisite grains showing rhombohedral cleavage fragments. (AmMin, v64,701).
Location: Mineralized laminated carbonaceous dolomite beds in the Carlin gold deposit, Eureka County, Nevada, USA. Scale: See Image.
© American Mineralogist

Fairchildite: K2Ca(CO3)2

Comments: PPL thin-section image of fused wood-ash stone, showing slightly altered lath-shaped cross-sections of fairchildite in a fine groundmass containing buetschliite and calcite. Inset image shows sample.
Location: Kaniksu National Forest, Idaho. (AmMin, v32:607). Scale: Thin Section 30 X.
© American Mineralogist

Ferro-anthophyllite: [ ]Fe++7Si8O22(OH)2

Comments: TEM image showing a small percentage of Pnma ferroanthophyllite of similar composition is present as thin slabs intergrown parallel to (100) of grunerite and as individual µ-size crystals.
Location: Rockport grunerite, Massachusetts, USA. (AmMin, v86:1252). Scale: See Image.
© American Mineralogist

Flinkite:  
Jarosewichite: Mn++3Mn+++(AsO4)(OH)6

Comments: Radial divergent spray of thick prismatic jarosewichite crystals with bladed flinkite crystals. (AmMin, v67:1043).
Location: Franklin mine, Franklin, SussexC ounty, New Jersey, USA. Scale: Scale Bar 100 µm.
© American Mineralogist