METACHERT
Metachert is metamorphosed chert. The physical properties of chert and metachert are quite similar (in some cases, not distinctive at all) - hard, dense, relatively smooth surfaces, sharp broken edges, and conchoidal fracture.
Metachert: Mineral information, data and localities. - mindat.org
Visually indistinguishable from normal chert but metamorphic state of directly adjacent rocks gives hints.
Gallery of Chert Rocks and Gemstones - ThoughtCo
- Flint Nodule. Chert forms in three main settings. When silica is outweighed …
- Jasper and Agate. The second setting that gives rise to chert is in gently …
- Gemstone Chert. Chert's hardness and variety make it a popular gemstone. …
- Bedded Chert. The third setting that gives rise to chert is in deep-sea basins, …
- White Chert. Chert of relatively pure chalcedony is typically white or off-white. …
Metachert occurs as lenses in a sheared argillitic matrix, as gray rhythmically bedded metachert with thin argillitic interbeds, and as small irregularly shaped bodies of red, green, or gray …
- File Size: 1MB
- Author: Sandra H.B. Clark
- Page Count: 16
- Publish Year: 1973
Metachert (novaculite) (Arkansas Novaculite, Devonian …
Metachert (novaculite; microporous metachert) from the Paleozoic of Arkansas, USA. (3.8 centimeters across at its widest) Metamorphic rocks result from …
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Geochemistry of metacherts associated with continental margin …
Oct 6, 2020 · The Asima metachert samples of this study form four groups based on geochemistry, petrography and field association: (1) black hematitic, (2) green epidote-chlorite …
Orocopia Schist in the northern Plomosa Mountains
Oct 18, 2018 · Metachert. Previous and ongoing studies reveal that PORS metachert (and associated siliceous marble, here not considered separately) comprises three principal …
Accretionary Mesozoic–Cenozoic expansion of the Cordilleran …
Apr 1, 2008 · The blueschist assemblage includes phyllitic metachert, metasedimentary semischist, and mafic metavolcanic rocks of an oceanic assemblage including igneous …
(PDF) Geochemistry of metacherts associated with …
Oct 1, 2020 · The Asima metachert samples of this study form four groups based on geochemistry, petrography and field association: (1) black hematitic, (2) green epidote-chlorite rich, (3) pink...
Geochemical characterization of the El Cortijo Formation …
Nov 1, 2021 · They allowed two groups of metacherts to be identified: gray-whitish (GWM) and green-bluish metacherts (GBM). The GWM present nodular and lens morphologies and are …
