vivianite crystal mineral sample very dark with striations
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Keywords: aggregate, black, bolivia, cluster, crystal, crystalline, emerald, fossil, gem, gemmy, gemology, geology, glass, glassy, green, hydrothermal, iron, isolade, jewel, jewelry, matrix, mineral, mineralogy, mining, nikischerite, ore, pegmatite, phosphate, rock, sample, specimen, stone, transparent, treasure, vivianite