American Mineralogist's Image Gallery

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

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

Karpatite: C24H12

Comments: Prismatic yellow karpatite (Ka) crystal on quartz (Qtz), cinnabar (Cin) and magnesite (Mgs)..
Location: Pichacho Peak Area, San Benito County, California, USA.. Scale: See Image.
© American Mineralogist

Kassite: CaTi2O4(OH)2

Comments: SEM images of kassite, a) brownish- pink rosette on feldspar surface and b) yellow spherules on pectolite crystal. (AmMin, v71:1045).
Location: Diamond Jo quarry, Magnet Cove, Hot Spring County, Arkansas, USA. Scale: Scale Bars 0.1 mm.
© American Mineralogist

Keilite: (Fe,Mn,Mg,Ca,Cr)S

Comments: B&W polished section image (a) of keilite (Ke) with troilite/pyrrhotite (Tro/Pyr) and metal (FeNi); gray, mostly oval grains are enstatite (En) and somewhat darker interstices are feldspars (Pl). (AmMin, v92:206).
Location: Zak?odzie enstatite achondrite. Scale: See Image.
© American Mineralogist

Khamrabaevite: (Ti,V,Fe)C  
Tistarite: Ti2O3

Comments: BSE image showing one tistarite (Ti2O3) grain along with khamrabaevite (TiC) and corundum. The cross marks where the electron back-scattered diffraction pattern (shown in Fig. 4) was collected. (AmMin, v94:841.
Location: From inside a chondrule from the Allende meteorite. Scale: See Image.
© American Mineralogist

Kitkaite: NiTeSe  
Penroseite: (Ni,Co,Cu)Se2  
Sederholmite: NiSe

Comments: B&W polished section image showing kitkaite replacing calcite in penroseite, clausthalite and sederholmite. Note the absence of the clausthalite envelope around kitkaite..
Location: Valley of the Kitka river in Kuusamo, northeast Finland. (AmMin, v50:581). Scale: 100 X.
© American Mineralogist

Kostovite: CuAuTe4

Comments: B&W, oil immersion, XPL image of a twinned grain of kostovite surrounded by native tellurium (Te), chalcopyrite (Cp), Tennantite (Tn) and barite (Ba). (AmMin, v51:29).
Location: Chelopech copper deposit, Bulgaria. Scale: Magnification 1,000 X.
© American Mineralogist

Kumtyubeite: Ca5(SiO4)2F2  
Srebrodolskite: Ca2Fe+++2O5  
Wadalite: Ca6Al5Si2O16Cl3  
Rondorfite: Ca8Mg(SiO4)4Cl2

Comments: BSE image of kumtyubeite (Kmt) associated with srebrodolskite (Srb), bultfonteinite (Blt), Ca- kydrosilicates, wadalite (Wad), rondorfite (Rndr), and ettringite (dark gray). (AmMin, v94:1361).
Location: Rock-forming mineral found in skarn carbonate-xenoliths in ignimbrites of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia. Scale: See Image.
© American Mineralogist

Laihunite: Fe++Fe+++2(SiO4)2

Comments: B&W optical micrograph of eulysite in reflected light. Fayalite (Fa) in dark gray with rhe layered laihunite (La) in light gray, pyroxene (Py), and magnetite (Mt). AmMin v69:154.
Location: Hebei Iron mine, China. Scale: See Image.
© American Mineralogist

Lakargiite: CaZrO3

Comments: BSE image of a pseudomorph of lakargiite after zircon. Cus = cuspidine, Lak = lakargiite, Zr-grt = kimzeyite-like mineral, Zrn = zircon, Bgd = baghdadite-like mineral, and Ap = apatite. (AmMin, v93:1905).
Location: North Caucasus, Kabardino-Balkaria, Russia. Scale: See Image.
© American Mineralogist

Lakebogaite: CaNaFe+++2H(UO2)2(PO4)4(OH)2(H2O)8

Comments: Yellow, tabular, prismatic lakebogaite crystal with Na-analogue of meurigite (IMA 2007-024) globules on a quartz matrix.
Location: A quarry, 10 km SSW of the township of Lake Boga, north-western Victoria, Australia. Scale: Crystal size 0.4 mm across.
© American Mineralogist

Lansfordite: MgCO3·5(H2O)  
Barringtonite: MgCO3·2(H2O)

Comments: Optical images of clusters of glassy lansfordite crystals and one white dehydrated barringtonite ? crystal. (AmMin, 88:1883).
Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale bar 800 µ-m.
© American Mineralogist

Lindbergite: Mn(C2O4)·2(H2O)

Comments: Secondary electron image of interlocked irregularly contoured platelets of lindbergite. (AmMin v 89, p 1088).
Location: Boca Rica mine, Sapucaia do Norte, Gilileia, Minas Gerais, Brazil. Scale: See Image.
© American Mineralogist

Lindsleyite: (Ba,Sr)(Ti,Cr,Fe,Mg)21O38

Comments: Lindsleyite (L) enclosing chrome spinel (C) and surrounded by chrome diopside (Cpx). Sample JJG-360, Bultfontein. B&W reflected light in air. (AmMin, v68:494).
Location: Metasomatized peridotites and heavy media concentrates from four kimberlites in the Republic of South Africa. Scale: Scale Bar 0.2 mm.
© American Mineralogist

Loudounite: NaCa5Zr4Si16O40(OH)11·8(H2O)

Comments: SEM image of several spherulitic aggregates of loudounite with acicular actinolite. AmMin, 21:37.
Location: Goose Creek quarry, Loudoun County, Virginia, USA. Scale: Scale Bar 50 µm.
© American Mineralogist

Lucasite-(Ce): CeTi2(O,OH)6

Comments: B&W image of a striated, euhedral lucasite-(Ce) crystal showing {001} and {101} faces. The dark substrate is calcite. (AmMin, v72:1006).
Location: Heavy-mineral concentrate derived from an olivine lamproite tuff at Argyle, in the east Kimberley region of Western Australia. Scale: See Image.
© American Mineralogist

Macedonite: PbTiO3

Comments: B&W image of pseudo-cubic macedonite grains. (AmMin, v56:387).
Location: Accessory mineral in the amazonite-rich, quartz-syenite veins in Crni Kamen near Prilep, Macedonia. Scale: Picture size 100 x.
© American Mineralogist

Manganochromite: (Mn,Fe++)(Cr,V)2O4

Comments: B&W polished section image showing a somewhat irregular manganochromite grain (pale grey) lying between hexagonal pyrrhotite (white) and a large diopside crystal (grey).
Location: Nairne pyrite formation, (Shepard's Hill Quarry), Brukunga, 47km east of Adelaide, South Australia. (AmMin, v63:1166). Scale: FOV 450 µm.
© American Mineralogist

Marecottite: Mg3(H2O)18[(UO2)4O3(SO4)2]2·10(H2O)

Comments: SEM image of a typical marecottite aggregate. Note the perfect cleavage along (011) and the trace of the twin composition plane (arrow). (AmMin, v 88, p 678).
Location: La Creusaz, Swiss Alps. Scale: See Image.
© American Mineralogist

Mathiasite: (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38

Comments: Mathiasite (M) exhibiting typical curvilinear cracks and incipient decomposition (upper left and lower right). Sample JFIS-I, Jagersfontein. Reflected light in air. (AmMin, v68:494).
Location: Metasomatized peridotites and heavy media concentrates from four kimberlites in the Republic of South Africa. Scale: Scale Bar 0.2 mm.
© American Mineralogist