Definition
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature
History
Origin
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-
Discoverer
Unknown
René Just Haüy
Etymology
From German Grauwacke, from grau grey + wacke
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1
Class
Sedimentary Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock