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| Click on image to enlarge. Photo © Daniel R. Snyder |
Tabular and acicular actinolite crystals in greenschist. XPL above, PPL below. Actinolite crystals are light green or dark green, with some zoned crystals and some crystals at extinction (black). Small, irregularly-shaped, multicolored grains at right are epidote. Black and gray mesostasis is mainly quartz. Greenschist pebble, specimen No. 52, from glacial gravel, southeastern Michigan. Provenance likely northwestern Ontario. Imaged area 0.57mm by 0.8mm.
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| Click on image to enlarge. Photo © Daniel R. Snyder |
PPL image of same area as shown in XPL image. Actinolite is green to blue-green. Small, irregularly-shaped, high-relief grains at right (pale yellow) are epidote, colorless mesostasis is mainly quartz.
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