WebIridescent Hematite on very large quartz crystals. Note: penny for scale. . . specimen in the far left portion of the table. Photo by Jeff Deere. botryoidal goethite/hematite. Photos by Jim Flora. Iridescent Hematite on quartz. … Websingle crystal (dimensions, 7 8 5 mm) after an 10-times-longer regrowth from a 0.3-mm-thick seed, but it was brown in color and had a crack on the {111} face. This phenomenon may be due to initial atomic hydrogen etching or a hot edge that will promote a darker, discontinuous interface during regrowth, twin formation, or internal stresses (15, 18).
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