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Phyllite Photomicrograph of thin section of phyllite (in cross polarised light) Fractured Duke stone showing phyllitic texture Phyllite. Phyllite (/ ˈ f ɪ l aɪ t / FIL-yte) is a type of foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. [1]
The Massachusetts Hornfels-Braintree Slate Quarry is a prehistoric archaeological site [2] in Milton and Quincy, Massachusetts.It consists of a series of pits and trenches used from 5,000 B.C. until the early 17th century as a source of slate and hornfels used for chipped and ground tools.
Flint breaks and chips into sharp-edged pieces, making it useful in constructing a variety of cutting tools, such as knife blades and scrapers. The use of flint to make stone tools dates back more than three million years; flint's extreme durability has made it possible to accurately date its use over this time.
Buckingham Slate is quarried in Buckingham County, Virginia, in the town of Arvonia. This natural stone has a distinct gray/blue/black color and glistens due to its mica content. This natural stone has a distinct gray/blue/black color and glistens due to its mica content.
Woody chips left for drying before transport to industrial off-takers in Namibia. Woodchips have been traditionally used as solid fuel for space heating or in energy plants to generate electric power from renewable energy. The main source of forest chips in Europe and in most of the countries [which?] have been logging residues
Tintagel Slate Quarries fall into two categories: the series of quarries lying between Tintagel Castle and Trebarwith Strand on the north coast of Cornwall, South West England and the open cast quarries further inland. There are around eight cliff-edge quarries as well as two wharfs, all of which are now disused as well as four inland sites ...
Buckingham Slate is quarried in Buckingham County, Virginia, in the town of Arvonia. This natural stone has a distinct gray/blue/black color and glistens due to its mica content. This natural stone has a distinct gray/blue/black color and glistens due to its mica content.
The darker blue color resulted in limestone from this region being dubbed "bluestone" and with two sequences measuring about 10,000 feet (3,000 m) thick, it gives the area one of the largest limestone deposits in the world. [20] The stone eventually fades from a deep blue to a light grey after prolonged exposure to sun and rain.
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