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Kurt Swenson was the fourth generation of his family to own and operate Swenson Granite Co. and its quarry on Concord's Rattlesnake Hill. ... That includes the original 1883 bill of sale for ...
In gemology, chatoyancy (/ ʃ ə ˈ t ɔɪ. ən s i / shə-TOY-ən-see), also called chatoyance or the cat's eye effect, [1] is an optical reflectance effect seen in certain gemstones, woods, and carbon fiber. Coined from the French œil de chat, meaning 'cat's eye'. The chatoyant effect is typically characterized by one or more well-defined ...
Originating from Namibia and China, where it is mined for use as a decorative stone due to its chaotic chatoyancy and brecciated structure. Ranging in colour from brownish-red, to blue-grey, and chatoyant yellow. The Chinese variety are predominantly a reddish-brown, with regions of chatoyant blue and yellow.
Mining this granite was the basis for quarries which were located on both sides of the river in the vicinity. Granite stone quarried nearby was used to construct the State, War and Navy building in Washington, D.C., and to build the 3-foot granite walls of Richmond's Gothic City Hall at 10th and Capitol Streets which was completed in 1894. (It ...
Jul. 5—CONCORD It seems unthinkable that a time would come when the Granite State no longer produces granite. But last month, the last commercial granite quarry in New Hampshire was quietly shut ...
Asterism on the surface of a blue star sapphire. A purple-pink star sapphire displaying asterism in a platinum ring.. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone.
Charoite (/ tʃ æ r oʊ. aɪ t / CHAR-ow-ait) is a rare silicate mineral with the chemical composition K(Ca,Na) 2 Si 4 O 10 (OH,F)•H 2 O, first described in 1978.It is named after the Chara River, despite its being 70 kilometres (43 mi) away from the discovery place.
Kyanite is also occasionally found in granite and pegmatites [9] [11] and associated quartz veins, [12] and is infrequently found in eclogites. It occurs as detrital grains in sedimentary rocks, although it tends to weather rapidly. [7] [11] It is associated with staurolite, andalusite, sillimanite, talc, hornblende, gedrite, mullite and ...
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