Koksha-Tal, Badakhshan Prov., Afghanistan, 63x47x40 mm, Tageslicht
Koksha-Tal, Badakhshan Prov., Afghanistan, 63x47x40 mm, langwelliges UV-Licht
Koksha-Tal, Badakhshan Prov., Afghanistan, 63x47x40 mm, Farbintensivierung bei Tageslicht nach längerer UV-Bestrahlung (Tenebrescence; reversibler Photochromismus)
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