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Tony Peterson's Photo Gallery

U32-TW1Metadolomite-carbonatite

Multiple photos available
Verity Property, Lempriere Station, Kamloops Mining Division, British Columbia, Canada

Dimensions: 15 cm x 8.5 cm x 7 cm

A fine foliated, but not much recrystallized dolomite carbonatite from the Verity sill. Inch scale magnetite crystals, with olivine, in a central mass are surrounded by calcite-dolomite-phlogopite-apatite-magnetite with minor zircon. A polished face is in the child photo.
Copyright: © Tony Peterson      Photo ID: 905549     Uploaded by: Tony Peterson   View Count: 17   Approval status: Public galleries    Type: Photo - 5243 x 3648 pixels (19.1 Mpix)

34W-EDNFayalite-Forsterite Series, Apatite

Multiple photos available
Mt Kibo, Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Field of View: 2.8 mm

Fayalite phenocryst in pale brown glass (plane polarized light) in anorthoclase phonolite. The fayalite is studded with colorless apatite crystals; black is an opaque oxide (ilmenite?). Red is stained epoxy.
Copyright: © Tony Peterson      Photo ID: 894410     Uploaded by: Tony Peterson   View Count: 17   Approval status: Public galleries    Type: Photo - 1280 x 960 pixels (1.2 Mpix)

34W-EDNPhonolite

Multiple photos available
Mt Kibo, Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Field of View: 7 mm

Glassy phonolite collected near Gilman's Point, plane polarized light. The large colorless crystal is anorthoclase, which exhibits characteristic twinning under crossed polars. Pale yellow-brown fayalite is studded with colorless apatite. Red is stained epoxy. Virtually identical rocks occur at Mount Kenya.
Copyright: © Tony Peterson      Photo ID: 894408     Uploaded by: Tony Peterson   View Count: 21   Approval status: Public galleries    Type: Photo - 1280 x 960 pixels (1.2 Mpix)

CXH-34TAlkali basalt

Multiple photos available
Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Dimensions: 6 cm x 4.5 cm x 3.5 cm
Field of View: 6 cm

Polished surface. Olivine is yellow-green, clinopyroxene black, plagioclase feldspar white/grey. Collected from outcrop between Horombo Huts and Kibo Hut.
Copyright: © Tony Peterson      Photo ID: 894064     Uploaded by: Tony Peterson   View Count: 38   Approval status: Public galleries    Type: Photo - 5238 x 3522 pixels (18.4 Mpix)

CXH-34TAlkali basalt

Multiple photos available
Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Field of View: 7 mm

Thin section, in plane polarized light, of an alkali basalt lava collected from outcrop between Horombo Huts and Kibo Hut. Phenocrysts of plagioclase (left), clinopyroxene (brown), magnetite (black), and olivine.
Copyright: © Tony Peterson      Photo ID: 894060     Uploaded by: Tony Peterson   View Count: 22   Approval status: Public galleries    Type: Photo - 1280 x 960 pixels (1.2 Mpix)

2WP-PTEPicrobasalt

Multiple photos available
Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Field of View: 7 mm

Thin section, in plane polarized light, of picrobasalt lava with phenocrysts of colorless olivine and pale brown augite. The groundmass consists of the same minerals (plus an oxide), with no visible feldspar. Collected on the Maua Route below Horombo Huts, 1984.
Copyright: © Tony Peterson      Photo ID: 893854     Uploaded by: Tony Peterson   View Count: 22   Approval status: Public galleries    Type: Photo - 1760 x 1320 pixels (2.3 Mpix)

2WP-PTEPicrobasalt

Multiple photos available
Mt Kilimanjaro, Kilimanjaro Region, Tanzania

Dimensions: 5 cm x 4 cm x 3.5 cm
Field of View: 5 cm

This sample, collected from outcrop on the Maua Route below Horombo Huts, has large phenocrysts of olivine and augite in a groundmass of the same (+opaques), with no visible feldspar. It is part of an alkali basalt suite that includes phonolites.
Copyright: © Tony Peterson      Photo ID: 893852     Uploaded by: Tony Peterson   View Count: 30   Approval status: Public galleries    Type: Photo - 5472 x 3648 pixels (20.0 Mpix)

YDU-6CLIjolite

Multiple photos available
Lake Magadi, Kajiado County, Kenya

Field of View: 3.5 mm

Thin section photo (plane polarized light) of ngurumanite from the Nguruman escarpment, west of Lake Magadi. Packed titanaugite phenocrysts are in contact with an Fe-rich residual pool containing elongated apatite. Opaque is magnetite.
Copyright: © Tony Peterson      Photo ID: 889584     Uploaded by: Tony Peterson   View Count: 42   Approval status: Public galleries    Type: Photo - 2560 x 1920 pixels (4.9 Mpix)

HNP-VRQIjolite

Lake Magadi, Kajiado County, Kenya

Field of View: 7 mm

Thin section photo (plane polarized light) of ngurumanite from the Nguruman escarpment, west of Lake Magadi. Euhedral titanaugite and nepheline (mostly altered) phenocrysts are surrounded by Fe-rich residual pools rich in apatite. Opaque is magnetite. Red/pink is stained epoxy.
Copyright: © Tony Peterson      Photo ID: 889583     Uploaded by: Tony Peterson   View Count: 20   Approval status: Public galleries    Type: Photo - 2560 x 1920 pixels (4.9 Mpix)

X2M-L2MIjolite

Multiple photos available
Lake Magadi, Kajiado County, Kenya

Dimensions: 5.5 cm x 5 cm x 2 cm

Polished surface. The precise locality is a tributary of the Oloibortoto River, which is sourced in the Nguruman Escarpment and drains into Lake Magadi from the west. Coarse-grained segregations of nepheline+titanaugite+magnetite (ijolite) with intercumulate pools of carbonate+zeolites occur in Tertiary olivine nephelinite (ankaratrite) flows. These were termed ngurumanite by Saggerson and Williams (1964, J Pet v. 5). They also contain separate Fe-P rich patches and abundant elongated apatite.
Copyright: © Tony Peterson      Photo ID: 889580     Uploaded by: Tony Peterson   View Count: 27   Approval status: Public galleries    Type: Photo - 3114 x 3558 pixels (11.1 Mpix)
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