Sunstone gem rough Tanzania devil red fire 7-15mm 20 carat lots 1-4 pieces for Sale

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Sunstone gem rough Tanzania devil red fire 7-15mm 20 carat lots 1-4 pieces For Sale

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Sunstone gem rough Tanzania devil red fire 7-15mm 20 carat lots 1-4 pieces :
$15.49

&amp;lt;img natural mine roughsunstone crystal fromTanzania Africa with thatclassicdevil red fire/sheen.Sunstoneis a plagioclasefeldspar, which when viewed from certain directions exhibits abrilliant spangled appearance.The optical effect appears to be due to reflections from inclusions of redcopper, in the form of minute scales, which arehexagonal,rhombic, or irregular in shape, and are disposed parallel to the principalcleavage plane. These inclusions give the stone an appearance something like that ofaventurine, hence sunstone is known also as \"aventurine-feldspar.\"The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is sometimes seen inorthoclase,hence two kinds of sunstone are distinguished as \"oligoclase sunstone\" and \"orthoclase sunstone.\"This is all natural untreatedcrystal materialaveragingapproximately 8 to 15 mm long and wide by 5 to 9 mm deep.Each lot will be scooped frommaterial as pictured into 20 carat lots with lots containing 1-4 pieces and many lots 2 pieces.