Graywacke

Siltstone

FR-13

Equal mix of angular and rounded sand-sized grains of quartz, with clay sized feldspars. Surface contains significant coverage of calcite that formed after lithification. Fresh surfaces do not effervesce with acid meaning that reaction is based on secondary calcite formation.

(Thin Section FOV: 1.28mm)

Not given

Purchased from Western Minerals, Inc.

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