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Alfredo Petrov's Photo Gallery

PVU-U9HAnorthoclase (Na,K)AlSi3O8

Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Largest Crystal Size: 2.5 cm

Thumbnail floater anorthoclase crystal from volcanic ash, Mt Kilimanjaro, 3,700 meter elevation.
Copyright: © Alfredo Petrov      Photo ID: 970535     Uploaded by: Alfredo Petrov   View Count: 8   Approval status: Public galleries    Type: Photo - 1147 x 1530 pixels (1.8 Mpix)

HRR-H0GGold Au , Quartz SiO2

Boroo Mine, Baruun-Haraa, Selenge Aimag, Mongolia

1cm mass of native gold embedded in 5.5cm massive quartz. Original label, "Boro, b. Ulan Bator, Mongolei", attributes the specimen to someone named Langer in 1963, who (I‘m guessing) was probably an East German working as a geologist in that then Soviet orbit state, and who picked it up in one of the old small-scale workings that predate the current Boroo mine.
Copyright: © Alfredo Petrov      Photo ID: 968130     Uploaded by: Alfredo Petrov   View Count: 16   Approval status: Public galleries    Type: Photo - 1224 x 1530 pixels (1.9 Mpix)

4EE-59EPyrite FeS2

Kvarntorp, Kumla, Örebro County, Sweden

1.5cm spheroidal aggregate of pyrite crystals with partial bluish grey tarnish on some faces. Floater, presumably extracted from oil shale host rock.
Copyright: © Alfredo Petrov      Photo ID: 967586     Uploaded by: Alfredo Petrov   View Count: 9   Approval status: Public galleries    Type: Photo - 945 x 913 pixels (0.9 Mpix)

4MR-G9EGold Au

Shiriuchi river alluvials, Shiriuchi, Kamiiso-gun, Oshima Subprefecture, Hokkaidō, Japan

Flattened gold nuggets, 3.5mm in size, panned from Shiriuchi river.
Copyright: © Alfredo Petrov      Photo ID: 957232     Uploaded by: Alfredo Petrov   View Count: 19   Approval status: Public galleries    Type: Photo - 1201 x 728 pixels (0.9 Mpix)

Meiji-era view

Mitsubishi-Hashima colliery, Hashima island, Nagasaki City, Nagasaki, Japan

View of Hashima island and colliery in the Meiji era (probably late 19th century). Hand colored postcard.
Photo ID: 955650     Uploaded by: Alfredo Petrov   View Count: 14   Approval status: Public galleries    Type: Photo - 1024 x 664 pixels (0.7 Mpix)

GR8-G61Pyrite FeS2

Ravelo, Chayanta Province, Potosí, Bolivia

1.55cm floater "iron cross" twin, with thin film of Fe oxides covering the surface.
Copyright: © Alfredo Petrov      Photo ID: 948902     Uploaded by: Alfredo Petrov   View Count: 21   Approval status: Public galleries    Type: Photo - 1003 x 946 pixels (0.9 Mpix)

1QM-G72Dawsonite NaAlCO3(OH)2

Maemura, Taki-cho, Mie, Japan

Field of View: 11 mm

Silky radiating sprays of dawsonite on a grey hornfels(?).
fov 11mm
Copyright: © Alfredo Petrov      Photo ID: 946332     Uploaded by: Alfredo Petrov   View Count: 11   Approval status: Public galleries    Type: Photo - 1120 x 955 pixels (1.1 Mpix)

NFA-XWRGalena PbS , Siderite FeCO3

Tatasí, Sud Chichas Province, Potosí, Bolivia

Pyramidal terminations of galena, with translucent yellowish siderite crystals, in a vug in a galena vein from the Tatasí mine. 10.5cm specimen.
Dr Fritz Berndt collection #83 (Berndt was an ore chemist in Bolivia in the 1950s. The tin sulphide berndtite was named after him.)
Copyright: © Alfredo Petrov      Photo ID: 946304     Uploaded by: Alfredo Petrov   View Count: 32   Approval status: Public galleries    Type: Photo - 1080 x 810 pixels (0.9 Mpix)

2WC-WUYRutile TiO2

Multiple photos available
New Melones Dam, West Belt, Calaveras Co., California, USA

Field of View: 1 cm
Largest Crystal Size: 5 mm

As there was no photo yet of New Melones Dam rutile on Mindat, I submit this one. Parallel needles of rutile as inclusions inside a quartz crystal. These needle bundles actually form a cross, although the cross arm is barely visible deeper inside the quartz. The upper half of the needles is about 5mm long. The picture looks a little fuzzy of course because it's snapped through the somewhat rough surface of the quartz crystal. The daughter photo was taken while immersed in water, in an attempt to slightly minimize the distortion.
Copyright: © Alfredo Petrov      Photo ID: 945645     Uploaded by: Alfredo Petrov   View Count: 16   Approval status: Public galleries    Type: Photo - 845 x 769 pixels (0.6 Mpix)

L1Q-W9JChengdeite Ir3Fe

Placer Deposits, Tulameen River, Similkameen Mining Division, British Columbia, Canada

2.2mm nugget of Pt-bearing chengdeite; ID by SEM/EDS.
Copyright: © Alfredo Petrov      Photo ID: 944487     Uploaded by: Alfredo Petrov   View Count: 46   Approval status: Public galleries    Type: Photo - 778 x 750 pixels (0.6 Mpix)
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