What does greywacke mean?
Definitions for greywacke
greywack·e
This dictionary definitions page includes all the possible meanings, example usage and translations of the word greywacke.
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Wiktionary
greywackenoun
A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.
Etymology: Anglicised form of grauwacke.
Wikidata
Greywacke
Greywacke or Graywacke is a variety of sandstone generally characterized by its hardness, dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or lithic fragments set in a compact, clay-fine matrix. It is a texturally immature sedimentary rock generally found in Palaeozoic strata. The larger grains can be sand- to gravel-sized, and matrix materials generally constitute more than 15% of the rock by volume. The term "greywacke" can be confusing, since it can refer to either the immature aspect of the rock or the fine-grained component of the rock. The origin of greywacke was problematic until turbidity currents and turbidites were understood, since, according to the normal laws of sedimentation, gravel, sand and mud should not be laid down together. Geologists now attribute its formation to submarine avalanches or strong turbidity currents. These actions churn sediment and cause mixed-sediment slurries, in which the rocks may exhibit a variety of sedimentary features. Supporting the turbidity current origin theory is that deposits of greywacke are found on the edges of the continental shelves, at the bottoms of oceanic trenches, and at the bases of mountain formational areas. They also occur in association with black shales of deep sea origin.
Numerology
Chaldean Numerology
The numerical value of greywacke in Chaldean Numerology is: 1
Pythagorean Numerology
The numerical value of greywacke in Pythagorean Numerology is: 8
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"greywacke." Definitions.net. STANDS4 LLC, 2024. Web. 3 May 2024. <https://www.definitions.net/definition/greywacke>.
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