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Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [ 1][ 2] They are not diamonds; the "diamond" in their name is due to both their clarity and well formed faces. Because the first discovery sites were in the ...
Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide ). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral and ...
The Eureka Quartzite is an extensive Paleozoic marine sandstone deposit in western North America that is notable for its great extent, extreme purity, consistently fine grain size of Quartzite, and its tendency to form conspicuous white cliffs visible from afar. The Eureka is commonly underlain and overlain by contrasting slope-forming ...
Quartz monzonite. Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase.
Gabriel Franchère’s 1813 sketch of Fort Astoria. The book describes an expedition to the mouth of the Columbia River and the ultimate failure of attempts in the early 19th century to establish a permanent American-controlled commercial base at Astoria. The 1810–1813 expedition was financed by the New York business man, John Jacob Astor ...
718, 347, 929, and 917. Astoria is a neighborhood in the western portion of the New York City borough of Queens. Astoria is bounded by the East River and is adjacent to four other Queens neighborhoods: Long Island City to the southwest, Sunnyside to the southeast, and Woodside and East Elmhurst to the east. As of 2019, Astoria has an estimated ...
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