American Mineralogist's Image Gallery

Pseudojohannite: Cu6.5[(UO2)4O4(SO4)2]2(OH)5·25H2O

Comments: SEM microphotograph of prismatic, tabular, pseudojohannite crystals from Musonoï (sample MGL 54110). (AmMin, v91, p930).
Location: Musonoï quarry near Kolwezi (Shaba, Congo). Scale: Picture Size 50 µm.
© American Mineralogist

Pseudojohannite: Cu6.5[(UO2)4O4(SO4)2]2(OH)5·25H2O

Comments: SEM microphotograph of prismatic, tabular, pseudojohannite crystals from Musonoï (sample MGL 54110). (AmMin, v91, p930).
Location: Musonoï quarry near Kolwezi (Shaba, Congo). Scale: Picture Size 50 µm.
© American Mineralogist

Pumpellyite-(Mn++): Ca2(Mn++,Mg)(Al,Mn+++,Fe)2(SiO4)(Si2O7(OH)2·(H2O)

Comments: BSE image of pumpellyite-(Mn++) (P) intercleaved with phlogopite (black) between braunite (white) and calcite (C).
Location: Mn oxide ores from the Precambrian Sausar Group, India. (AmMin, v76:241). Scale: Scale Bar 0.01 cm.
© American Mineralogist

Pumpellyite-(Mn++): Ca2(Mn++,Mg)(Al,Mn+++,Fe)2(SiO4)(Si2O7(OH)2·(H2O)

Comments: BSE image of pumpellyite-(Mn++) (P) intercleaved with phlogopite (black) between braunite (white) and calcite (C).
Location: Mn oxide ores from the Precambrian Sausar Group, India. (AmMin, v76:241). Scale: Scale Bar 0.01 cm.
© American Mineralogist

Qusongite: WC

Comments: BSE image of qusongite (1, 2) and Cr2O3 (3, 4). The high hardness of qusongite shows up in the polished section as relief between the two minerals (AmMin, v94:389.
Location: Heavy mineral concentrate from chromite ores from the Luobusa ophiolite, Qusong County, Tibet, China. Scale: See Image.
© American Mineralogist

Qusongite: WC

Comments: BSE image of qusongite (1, 2) and Cr2O3 (3, 4). The high hardness of qusongite shows up in the polished section as relief between the two minerals (AmMin, v94:389.
Location: Heavy mineral concentrate from chromite ores from the Luobusa ophiolite, Qusong County, Tibet, China. Scale: See Image.
© American Mineralogist

Radtkeite: Hg3S2ClI  
Corderoite: Hg3S2Cl2

Comments: SEM image of prismatic radtkeite crystals and equant corderoite crystals on quartz matrix. AmMin, v76:1715).
Location: McDermitt mercury mine, Humboldt County, Nevada, USA. Scale: Scale Bar 10 µm.
© American Mineralogist

Radtkeite: Hg3S2ClI  
Corderoite: Hg3S2Cl2

Comments: SEM image of prismatic radtkeite crystals and equant corderoite crystals on quartz matrix. AmMin, v76:1715).
Location: McDermitt mercury mine, Humboldt County, Nevada, USA. Scale: Scale Bar 10 µm.
© American Mineralogist

Ramanite-(Rb): Rb[B5O6(OH)4]·2H2O  
Ramanite-(Cs): Cs[B5O6(OH)4]·2H2O  
Santite: KB5O6(OH)4·2(H2O)

Comments: Unheated Type-B melt inclusions in graphic quartz. 1 = ramanite-(Cs), 2 = sassolite, 3 = ramanite-(Rb), 4 = santite, 5 = topaz, V = vapor. (AmMin, v93:1035).
Location: Graphic pegmatite quartz from the Island of Elba, Italy. Scale: Scale Bar 15µm.
© American Mineralogist

Ramanite-(Rb): Rb[B5O6(OH)4]·2H2O  
Ramanite-(Cs): Cs[B5O6(OH)4]·2H2O  
Santite: KB5O6(OH)4·2(H2O)

Comments: Unheated Type-B melt inclusions in graphic quartz. 1 = ramanite-(Cs), 2 = sassolite, 3 = ramanite-(Rb), 4 = santite, 5 = topaz, V = vapor. (AmMin, v93:1035).
Location: Graphic pegmatite quartz from the Island of Elba, Italy. Scale: Scale Bar 15µm.
© American Mineralogist

Reidite: ZrSiO4

Comments: Scanning electron microscope photomicrograph of the surface of an etched shocked zircon with a skeletal crystalline phase that may be reidite. X-ray diffraction data indicate that this zircon contains minor amounts of reidite. (AmMin 87:563).
Location: Found in an upper Eocene impact ejecta layer in marine sediments on the upper continental slope off New Jersey and on Barbados. Scale: See Image.
© American Mineralogist

Reidite: ZrSiO4

Comments: Scanning electron microscope photomicrograph of the surface of an etched shocked zircon with a skeletal crystalline phase that may be reidite. X-ray diffraction data indicate that this zircon contains minor amounts of reidite. (AmMin 87:563).
Location: Found in an upper Eocene impact ejecta layer in marine sediments on the upper continental slope off New Jersey and on Barbados. Scale: See Image.
© American Mineralogist

Rubicline: (Rb,K)AlSi3O8

Comments: Rubicline (white) including grains of quartz (black) in microcline (gray) associated with albite (black) and muscovite (mottled dark gray). BSE image (AmMin, 83:1336).
Location: Pollucite-bearing rare-element pegmatite at San Piero in Campo, Elba, Italy. Scale: Grain size 20 µm.
© American Mineralogist

Rubicline: (Rb,K)AlSi3O8

Comments: Rubicline (white) including grains of quartz (black) in microcline (gray) associated with albite (black) and muscovite (mottled dark gray). BSE image (AmMin, 83:1336).
Location: Pollucite-bearing rare-element pegmatite at San Piero in Campo, Elba, Italy. Scale: Grain size 20 µm.
© American Mineralogist

Rudashevskyite: (Fe,Zn)S

Comments: B&W reflected light image of rudashevskyite (Rud) attached to large schreibersite grain (Schr), associated with troilite (Tr), idiomorphic roedderite tablets (Roed), and clinoenstatite (Px) (AmMin, v93:903).
Location: Indarch meteorite, Shusha, Nagorno-Karabakh, Azerbaijan. Scale: See Image.
© American Mineralogist

Rudashevskyite: (Fe,Zn)S

Comments: B&W reflected light image of rudashevskyite (Rud) attached to large schreibersite grain (Schr), associated with troilite (Tr), idiomorphic roedderite tablets (Roed), and clinoenstatite (Px) (AmMin, v93:903).
Location: Indarch meteorite, Shusha, Nagorno-Karabakh, Azerbaijan. Scale: See Image.
© American Mineralogist

Scheuchzerite: Na(Mn,Mg)9[VSi9O28(OH)](OH)3  
Saneroite: Na2(Mn++,Fe+++)10Si11V+++++O34(OH)4

Comments: BSE image of acicular scheuchzerite crystals (Sz) partially intergrown with platy saneroite (Snr) in a vug lined with minute quartz (Qtz) crystals. (AmMin v91:937).
Location: Metamorphosed synsedimentary exhalative Mn deposit of Fianel, Val Ferrera, Central Alps, Switzerland. Scale: See Image.
© American Mineralogist

Scheuchzerite: Na(Mn,Mg)9[VSi9O28(OH)](OH)3  
Saneroite: Na2(Mn++,Fe+++)10Si11V+++++O34(OH)4

Comments: BSE image of acicular scheuchzerite crystals (Sz) partially intergrown with platy saneroite (Snr) in a vug lined with minute quartz (Qtz) crystals. (AmMin v91:937).
Location: Metamorphosed synsedimentary exhalative Mn deposit of Fianel, Val Ferrera, Central Alps, Switzerland. Scale: See Image.
© American Mineralogist

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

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