Figure F37. Disseminated pyrite front separating the green halo (lower field of view) from the background saponitic alteration (upper field of view) (Sample 301-U1301B-14R-1 [Piece 11, 90–92 cm]). A. Reflected light (field of view [FOV] = 2.75 mm). B. The red lines indicate the position of the pyrite front; the celadonitic alteration of the green halo can be seen below it; plane-polarized light (FOV = 5.5 mm).
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