Figure F151. Composite vein filled with saponite (brownish mineral near black opaque mineral) and fine-grained chalcedony along the vein wall and with coarse-grained chalcedony in the vein center (Thin Section 4; Sample 309-1256D-77R-1 [Piece 22A, 112–116 cm]). A. Field of view (FOV) = 3 mm; plane-polarized light, blue filter. B. Same as A, cross-polarized light.
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