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displaying iridescent metallic tarnish
This specimen
It is light brown in color with well-developed euhedral crystals
Dimension: 25×18×10cm
Gibbsite from Dachang Mine
Stibnite‑Calcite‑Selenite Epigenetic‑Growth Specimen 3 base displaying iridescent metallic tarnishStibniteCalciteSelenite EpigeneticGrowth Specimen from Weishan YiHui Autonomous County, Dali, Yunnan Province, China Primary stibnite crystals crystallized first within the hydrothermal vein. Orangetoned scalenohedral calcite later precipitated and encrusted the stibnite matrix. Finegrained fibrous selenite fully covered the calcite layer afterward. Exposed calcite crystals are manually chiselled out from the outer selenite layer. This threestage
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