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RUTILE ( Milled Dark ), 99%, TWO (2) pound, Ceramic Supply
$19.00, located in Bethel, Ohio, USA (451**), item #133131321429
Rutile has one of the highest refractive indices at visible wavelengths of any known crystal and also exhibits a particularly large birefringence and high dispersion. Natural rutile may contain up to 10% iron and significant amounts of niobium and tantalum.
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