Filters: Tags: Clearwater County, Idaho (X) > Types: OGC WMS Layer (X)
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Album caption: Photomicrograph showing small round garnet crystals (black) in a microcline-bearing light-colored band in the course-grained gneiss. Just north of locality 428. pla-plagioclase; mi-microline; qu-quartz. crossed nicols. Clearwater County, Idaho. c. 1950. Published as figure 61B in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Photomicrograph of the rock shown in A. Small plagioclase laths (pl) and biotite flakes (B) are included in anhedral grains of orthoclase (or) and quartz (Q). Crossed nicols. Clearwater county, Idaho. c. 1957. Published as figure 6B in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: A polished hand specimen of thin laminated gneissic layer in the schist. The dark laminae consist of sillimanite and biotite. The light layers are quartz, plagioclase, and some garnet. Clearwater County, Idaho. c. 1950. Published as figure 8 in U.S. Geological Survey. Professional paper 344-A. 1962.
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Tags: Alumina Clay,
Clearwater County, Idaho
Polished hand specimen of the metasomatic plagioclase (An50) - biotite-garnet rock from 1 mile east of the mouth of Elk Creek. All light-colored minerals are andesine (a); the dark round grains ate (sic) garnet (g); biotite (b) occurs between the other minerals. Clearwater County, Idaho. c. 1950. Published as figure 80A in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Polished hand specimens of diopside-plagioclase gneiss with secondary hornblende and plagioclase: No. 1, parallel to the bedding; No. 2, along a crack. Locality 208 along the North Fork of the Clearwater River. Clearwater County, Idaho. c. 1950. Published as figure 19 in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Photomicrograph of quartz diorite along Beaver Creek. Dark mineral are hornblende (ho) and biotite (Bi). Plane-polarized light. Clearwater county, Idaho. c. 1957. Published as figure 9A in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: Photomicrograph of the field of figure A with crossed nicols. Plagioclase (pl) occurs in lath-shaped crystals that are twinned and zoned. Quartz (Q) is intersticial. Clearwater county, Idaho. c. 1957. Published as figure 9B in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: Two generations of late plagioclase are seen in a specimen of quartz diorite about a mile north of Bruces Eddy. The ealier plagioclase was crystallized as large grains in biotite quartzite and gneiss, the remnants of which are seen at left. The large white grains in the diorite are remnants of the same early plagioclase. The small grains of plagioclase in the quartz diorite are later. Clearwater County, Idaho. c.1950. Published as figure 87 in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Photomicrograph showing secondary large round andesine grains in a fie-grained (sic) biotite schist along the North Fork of the Clearwater River near Dent. Large round plagioclase grains shown in top part of photomicrogrpah have crystalized late and disturbed the original foliated structure of the schist. a-andesine, b-biotite, q-quartz. Crossed nicols. Clearwater County, Idaho. c. 1950. Published as figure 80B in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Photomicrograph showing tonalitic gneiss that contains large round plagioclase (pla) crystals embedded in fine-grained biotite-plagioclase gneiss. Clearwater County, Idaho. From railroad cut 2 miles west of Ahsahka. c. 1950. Published as figure 61C in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Photograph of granite near Bungalow (loc. 758). Coarse-grained granite in which quartz grains (gray) and biotite flakes (black) are easily seen. Clearwater County, Idaho. n.d. Published as figure 14-A in U.S. Geological Survey Professional paper 344-D. 1963.
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Album caption: Photomicrograph of gabbro along Beaver Creek. The main dark constituents are pyroxene (A) and hornblend (ho). Biotite (Bi) and magnetite (black) occur in small quantities. Plane-polarized light. Clearwater county, Idaho. c 1957. Published as figure 9C in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: Photomicrograph of the rock shown in figureA. Orthoclase (or) includes a few small plagioclase (pl) grains; some myrmekite (my) occurs between the orthoclase and bordering plagioclase. Quartz(Q); biotite (B). Clearwater county, Idaho. c 1957. Published as figure 11B in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: Photomicrograph of the field of figure C with crossed nicols. Plagioclase (pl) is subhedral, shows complex twinning, and is zoned. Clearwater county, Idaho, c.1957. Published as figure 9D in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: Photomicrograph of a common type of granite porphyry just east of Browns Rock. Phenocrysts are quartz (Q), orthoclase (or), and plagioclase (pl); the groundmass, which consists of these minerals plus a small amount of biotite, is fine to medium grained. Narrow rims of granophyric intergrowth of quartz and orthoclase are common around the quartz phenocrysts. Clearwater county, Idaho. circa 1957. Published as figure 15A in U.S. Geological Survey. Professional paper 344-D. 1963.
Album caption: Photomicrograph of monzotonalitic dike 2 miles northeast of French Mountain. Phenocrysts are plagioclase (pl), quartz (Q), biotite (B), and hornblende (ho). Groundmass is fine grained and contains orthoclase in addition to the minerals that occur as phenocrysts. Clearwater county, Idaho. c. 1957. Published as figure 15D in U.S. Geological Survey. Professional paper 344-D. 1963.
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Album caption: Photomicrograph of the rock (no. 1983) shown in A. Unzoned plagioclase (An34) occurs in elongated grains that show parallel orientation and complex twinning (pl). Quartz grains (Q) are anhedral and strained. Hornblende (ho) and biotite (B) are the dark constituents. Crossed nicols. Clearwater county, Idaho. c 1957. Published as figure 5B in U.S. Geologic Survey. Professional paper 344-D. 1963.
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Album caption: A polished hand specimen of diopside-plagioclase gneiss with irregular areas rich in hornblende (dark). Crawford mine. Clearwater County, Idaho. c. 1950. Published as figure 13 in U.S. Geological Survey. Professional paper 344-A. 1962.
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Album caption: Calcium-magnesium silicate rock with abundant scapoilte (sc), diopside (di), and grossularite (g). pla-plagioclase; ti-sphene. Road cut along North Fork of Clearwater River half a mile east of the mouth of Dicks Creek (loc. 11, pl. 3). Plane polarized light. Clearwater County, Idaho. circa 1950. Published as figure 70 in U.S. Geological Survey. Professional paper 344-A. 1962.
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