© 2004 gggems.com All rights reserved.(Na, Li,Ca) (Fe2, Mg, Mn, Al)3 Al6 I(OH)4 I (BO3)3ISi6O18I · Crystallographic properties: Trigonal. Hardness 7 - 7.5 Density 3.02 to 3.26 Refractive index: 1.62 - 1.64 · Chemical Properties: Alumina boros...
Self Improvement And Motivation self improvement motivation tourmaline type tourmalines madagascar blue antsongombato© 2004 gggems.com All rights reserved. Extracts of Articles AmethystThe art of lapidary is to place the color correctly in order to make homogeneous the tone of the cut stone. The distribution of the color in a cut stone is observed simply by i...
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