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Tony Peterson's Photo Gallery

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: 15   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: 8   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: 15   Approval status: Public galleries    Type: Photo - 3114 x 3558 pixels (11.1 Mpix)

6TV-PPXAnkaratrite

Multiple photos available
Lake Magadi, Kajiado County, Kenya

Dimensions: 8 cm x 6 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. These Tertiary olivine nephelinite flows are rich in carbonate-zeolite segregations interpreted as late carbonatite melt (Saggerson and Williams 1964, J Pet v. 5). Red is altered olivine, black is augite.
Copyright: © Tony Peterson      Photo ID: 889507     Uploaded by: Tony Peterson   View Count: 22   Approval status: Public galleries    Type: Photo - 4398 x 3480 pixels (15.3 Mpix)

5NF-4UDNepheline-phonolite

Multiple photos available
Mount Kenya, Meru County, Kenya

Dimensions: 14 cm x 10.5 cm x 5 cm

With nepheline (brown) and sanidine phenocrysts, in a devitrified glassy matrix.
Copyright: © Tony Peterson      Photo ID: 889334     Uploaded by: Tony Peterson   View Count: 19   Approval status: Public galleries    Type: Photo - 4776 x 3600 pixels (17.2 Mpix)

L8T-UPDLherzolite

Mount Leura, Camperdown, Corangamite Shire, Victoria, Australia

Dimensions: 8.5 cm x 8 cm x 7 cm

A sawn, unpolished surface through a very fresh, even-grained spinel peridotite (pale green olivine, deep green clinopyroxene, brown orthopyroxene, gray spinel).
Copyright: © Tony Peterson      Photo ID: 888844     Uploaded by: Tony Peterson   View Count: 24   Approval status: Public galleries    Type: Photo - 4524 x 3648 pixels (16.5 Mpix)

VWR-6E5Lherzolite

Mount Leura, Camperdown, Corangamite Shire, Victoria, Australia

Dimensions: 14 cm x 12 cm x 8 cm

A lunch-crushing xenolith with the basalt skin breached just enough to reveal the peridotite interior (spinel lherzolite).
Copyright: © Tony Peterson      Photo ID: 888843     Uploaded by: Tony Peterson   View Count: 9   Approval status: Public galleries    Type: Photo - 3846 x 3032 pixels (11.7 Mpix)

YK7-6X8Lherzolite

Mount Shadwell, Mortlake, Moyne Shire, Victoria, Australia

Dimensions: 8 cm x 6 cm x 5 cm

Polished surface. This cpx-rich lherzolite xenolith in basalt has large clove brown orthopyroxene resembling amphibole, but with good rectangular cleavage. The margin of the xenolith has been slightly melted.
Copyright: © Tony Peterson      Photo ID: 888842     Uploaded by: Tony Peterson   View Count: 13   Approval status: Public galleries    Type: Photo - 3288 x 3552 pixels (11.7 Mpix)

K49-EVNKyanite : Al2(SiO4)O

Anderson Lake mine, Snow Lake District, Manitoba, Canada

Dimensions: 12 cm x 9 cm x 5 cm

With sericite and albite. The kyanite has a pale brown-grey color, not the usual blue color, because the protolith was a hydrothermally altered rhyolite with very little Fe present.
Copyright: © Tony Peterson      Photo ID: 888593     Uploaded by: Tony Peterson   View Count: 9   Approval status: Public galleries    Type: Photo - 4410 x 3618 pixels (16.0 Mpix)

KVH-MCYPegmatitic Ijolite

Multiple photos available
Ice River Alkaline Complex, Golden Mining Division, British Columbia, Canada

Dimensions: 10 cm x 7 cm x 7 cm

This extremely fresh, very melanocratic ijolite (jacupirangite) consists mainly of coarse cumulate titanaugite and phlogopite up to 8 cm, with minor nepheline and apatite, magnetite, and perovskite.
Copyright: © Tony Peterson      Photo ID: 888588     Uploaded by: Tony Peterson   View Count: 27   Approval status: Public galleries    Type: Photo - 4452 x 3546 pixels (15.8 Mpix)
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