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・ Knot energy
・ Knot Feeder
・ Knot garden
・ Knot Gneiss
・ Knot group
・ Knot in 3D
・ Knot invariant
・ Knot of Stone
・ Knot operation
・ Knot polynomial
・ Knot tabulation
・ Knot theory
・ Knot thickness
・ Knot, Nancowry
・ Knoten (hill)
Knotenschiefer
・ Knotfest
・ Knothole Gang
・ Knotice
・ Knotlamp
・ Knotless knot
・ Knotroot
・ Knots (Crash of Rhinos album)
・ Knots (film)
・ Knots (Sons of Noel and Adrian album)
・ Knots and Crosses
・ Knots and Crosses (Rebus)
・ Knots in My Yo-Yo String
・ Knots in Washington
・ Knots Landing


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Knotenschiefer : ウィキペディア英語版
Knotenschiefer

Knotenschiefer is a variety of spotted slate characterized by conspicuous subspherical or polyhedral clots that are often individual minerals such as cordierite, biotite, chlorite, andalusite and others.〔Bucksch, Herbert (1997). ''Dictionary of Geotechnical Engineering'', Vol. 2., Springer-Verlag, Berlin. ISBN 3-540-58163-4.〕
Like fleckschiefer, fruchtschiefer and garbenschiefer, knotenschiefer is a variety of contact metamorphic slate. It is formed at temperatures of around 400 °C and its dark coloration is caused by graphite. Fruchtschiefer occurs at 500 °C. Knotenschiefer is characterised by small nodules, up to one centimetre in size, and nodular deposits of mica as a result of the growth in grain size during metamorphism. The nodules consist of iron minerals, carbon substances and mica; as the metamorphic temperature rises, minerals such as andalusite or chiastolite increasingly occur.
==References==

* Walter Maresch, Olaf Medenbach: ''Steinbachs Naturführer. Gesteine.'' S. 252. Mosaik Verlag, München 1987, ISBN 3-576-10699-5.
* (''Fleckschiefer.'' ) Otto Lueger: ''Lexikon der gesamten Technik und ihrer Hilfswissenschaften.'' Bd. 4, Stuttgart, Leipzig 1906, S. 82.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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