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Usage examples:

• A beautiful bust of gray- wacke in our possession probably represents the same king.

  - "The Complete Historical Romances of Georg Ebers", Georg Ebers.

• The newest of these, connected with the higher series of coal- measures, is well exhibited along the shores of the Forth, in Fifeshire, where they consist of basalt with olivine, amygdaloid, greenstone, wacke, and tuff.

  - "The Student's Elements of Geology", Sir Charles Lyell.