Browse Items (129 total)

  • Contributor is exactly "Western Minerals Inc."

http://dl.dropboxusercontent.com/s/tlt0jg4kqvqycrw/PPC-13.jpg
(exotic block)

Anorthosite
The specimen was collected from the Oregon Dome Massif. The Oregon Dome is similar in all respects to the anorthosites described and analyzed by Buddington (1939) for the Adirondack High Peaks region (Marcy Massif). Texturally, the present specimens…

http://dl.dropbox.com/u/66399955/NAO-16.JPG
Antigorite, magnetite, carbonates (ankerite), diopside, clinohumite, tremolite, chlorite. Rarely, pseudomorphs on primary pyroxenes may be recognized, though there is superimposition of various deformational phases.

http://dl.dropbox.com/u/66399955/NAO-17.JPG
Antigorite, magnetite, ankeritic carbonate, diopside, tremolite. A very marked subsequent foliation nearly completely obliterates a previous initial foliation.

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From the Concord Granite. Thin section contains plagioclase, potassium feldspar, quartz, biotite, and muscovite. Hand sample is finer grained and contains feldspars, quartz, and micas.

http://dl.dropboxusercontent.com/s/t1md05miyp7c8fg/PPC-12.jpg
Altered Basalt-greenstone

http://dl.dropbox.com/u/66399955/NAO-11.JPG
Hyaloclastite of basalt with superimposed metamorphism in pumpellyite-prehnite facies.

http://dl.dropboxusercontent.com/s/w93vieozt2vr009/PPC-4.jpg
Blueschist from an outcrop in a stream bed

http://dl.dropboxusercontent.com/s/3byjtmlhkxdtfdi/PPC-17.jpg
Thinly banded Blueschist

http://dl.dropboxusercontent.com/s/molt83n09fixszt/PPC-19.jpg
Dense Blueschist

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Part of the The Granite Gorge Metamorphic Suite, this is usually considered a metavolcanic, and its mineralogy is dominated by quartz and mica.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-6.JPG
Green clay lithology of the Bright Angel Shale.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-7.JPG
Red siltstone lithology of the Bright Angel Shale.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-9.JPG
A silty-shale where the clasts are dominated by quartz. Sample collected from an area typified by interbedded limestones and shale.

Both thin section images were taken at a 400x magnification.

Calcsilicate rock
Minerals found in the calcsilicate facies contain quartz, diopside, enstatitic pyroxene, tremolite, calcite, and phlogopite. However, only a few thin sections have been found to contain all phases. In some specimens, the pyroxene is close to 100%…

PH-5 Hand Sample.
White Carbonatite. Found on Southwest side of the main rock unit body on North side of Beaver Creek about 1/4 mi.

PH-11 Hand Sample.
Light brown to almost off-white fine grained Carbonatite. Delicated Barite appears in very thin layers on one side of the rock.
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