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Sharpening stones, or whetstones, [1] are used to sharpen the edges of steel tools such as knives through grinding and honing. Such stones come in a wide range of shapes, sizes, and material compositions. They may be flat, for working flat edges, or shaped for more complex edges, such as those associated with some wood carving or woodturning ...
The novaculite beds of the south-central United States were deposited in the Ouachita Geosyncline, a deep-water marine trough, during Silurian to early Mississippian time. . Sedimentation consisted primarily of siliceous skeletal particles of marine organisms such as sponge spicules and radiolaria, and very fine-grained, wind-blown quartz particles; there was very little argillaceous ...
A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).
The best varieties of belomorite are translucent or transparent, they have a pearl-glass luster and iridescence in blue, gray-blue, violet-blue, greenish-blue or pale violet tones. The most famous deposits of this gem are in the north, in the pegmatites of the Kola Peninsula and Karelia .
It is transparent to translucent with perfect cleavage. Refractive index values are n α = 2.170 – 2.200, n β = 2.220, and n γ = 2.300 – 2.320. Typical occurrence is in association with high-temperature hydrothermal vein deposits and altered granites with greisen , granite pegmatites and in alluvial deposits.
The crystals are transparent to translucent, with a vitreous to greasy luster. The color is usually bright blue, but it can also be white, grey, yellow, green and pink. [4] [5] [6] In thin section the crystals are colorless or pale blue, [6] [13] and the streak is very pale blue to white.
The cryptocrystalline varieties are either translucent or mostly opaque, while the transparent varieties tend to be macrocrystalline. Chalcedony is a cryptocrystalline form of silica consisting of fine intergrowths of both quartz, and its monoclinic polymorph moganite . [ 34 ]
The Whetstones are, or were, a stone circle beneath Corndon Hill in the parish of Church Stoke, Montgomeryshire, Wales, near the border with Shropshire, England. They lie immediately to the west of the village of White Grit and close to Priestweston. [1] The site is also a short distance from the better-known Hoarstones and Mitchell's Fold circles.
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