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Album caption: Bleached porphyry of Hahns Peak. Dark quartz andesite porphyry dike rock. Routt County, Colorado. 1972. (Specimen) Published as figure 6 in U. S. Geological Survey. Bulletin 1367. 1973.
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Album caption: Breccia texture fading out into more massive jas-peroid. Lake Valley mining district, Sierra County, New Mexico. 1962.
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Album caption:Milky-white fragments of jasperoid in a dark red-dish-black hematite matrix. Lake Valley mining district, Sierra County, New Mexico. April 1962. Published as figure 5_B in U. S. Geological Survey. Bulletin 1222_D. 1966.


    map background search result map search result map Breccia texture fading out into more massive jas-peroid. Lake Valley mining district, Sierra County, New Mexico. 1962. Milky-white fragments of jasperoid in dark red-dish-black hematite matrix. Lake Valley mining district, Sierra County, New Mexico. 1962. Bleached porphyry of Hahns Peak. Routt County, Colorado. 1972. Bleached porphyry of Hahns Peak. Routt County, Colorado. 1972. Breccia texture fading out into more massive jas-peroid. Lake Valley mining district, Sierra County, New Mexico. 1962. Milky-white fragments of jasperoid in dark red-dish-black hematite matrix. Lake Valley mining district, Sierra County, New Mexico. 1962.