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Figure F21. Example of the crosscutting relationship between talc (Tc), serpentine (Srp), and clay minerals replacing olivine (Ol) in olivine gabbro (Thin Section 97; Sample 345-U1415P-3R-1, 120–123 cm). Serpentine fills fracture in an olivine grain to form mesh texture. The serpentine mesh is visible in the clay-mineral domain but is absent in talc-rich domains in this slide. Dominant opaque mineral is possibly magnetite and pyrite in serpentine veinlets and clay/talc matrix, respectively. Pl = plagioclase. A. Plane-polarized light. B. Under crossed polars.

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