Image:PO-breccia.jpg

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Silicified and mineralized breccia, light gray is mostly dolomite with a little translucent quartz. Dark gray is jasperoid and ore minerals. Veinlet along lower edge of specimen contains sphalerite in carbonates, Pend Oreille mine. Pend Oreille County, Washington. 1936. Plate 23-B, U.S.Geological Survey Professional paper 202. 1943.

Image file: http://libraryphoto.cr.usgs.gov/htmllib/btch289/btch289j/btch289z/btch289/pcf00091.jpg

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