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Kyanite orange red gem translucent crystals Tanzania 10 gram lots 4-9 crystals For Sale
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Kyanite orange red gem translucent crystals Tanzania 10 gram lots 4-9 crystals :
$21.99
<img gram lots of RARE red/orange kyanite crystals just as they come from the earth in Tanzania,Africa with piece size running from approximately 1/8 to 1/4 wide by 3/4 to 2 1/4 inches in length.This material is mixed grade and some looks to be facet grade type 3 stone with nice saturation and clarity.Each 10 gram lot will be scooped from crystals as pictured and number of crystals will vary depending on size of individual crystals but lots will contain from 4 to 9 crystals.
Kyanite,name comes from the Greek wordkuanossometimes referred to as \"kyanos\", meaning deep blue,as typically kyanite is blue.Kyanite is a silicate mineral, commonly found in aluminium-rich metamorphic rock.Kyaniteis also known as disthene, rhaeticite and cyanite.andvarieties include the recently discovered orange or red kyanite from Tanzania as is offered here.The redish orange color is due to inclusion of small amounts ofmanganese(Mn3+) in the crystal.ColorBlue, white, rarely green, gray, yellow, pink, orange, and black, can be zonedCrystal habitColumnar; fibrous; bladedTwinningLamellar on {100}Cleavage[100] perfect [010] imperfect with 79° angle scalehardness4.5-5 parallel to one axis
6.5-7 perpendicular to that axisLusterVitreous to pearlyStreakWhiteDiaphaneityTransparent to translucentSpecific gravity3.53 - 3.65 measured; 3.67 calculatedOptical propertiesBiaxial (-)Refractive indexnα = 1.712 - 1.718 nβ = 1.720 - 1.725 nγ = 1.727 - 1.734PleochroismTrichroic, colorless to pale blue to blue
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