Trapiche Rubies
1996; Gemological Institute of America; Volume: 32; Issue: 4 Linguagem: Inglês
10.5741/gems.32.4.242
ISSN2376-4473
AutoresKarl Schmetzer, Henry A. Hänni, Heinz-Jürgen Bernhardt, Dietmar Schwarz,
Tópico(s)Mineralogy and Gemology Studies
Resumoy crystals from Southeast Asia with a fixed six-rayed star, similar in effect to trapiche emeralds from Colombia, are described.They consist of six trunsparent-to-translncent ruby sectors separated by nontransparent yellow or white planes.Most samples also have a hexagonal tapered yellow, black, or red core.In the yellow or white arms of the star and in the boundary zones between the core and the six ruby sectors, a massive concentration of tube-like inclusions is seen.These inclusions are oriented perpendicular to the morphologically dominant dipyramidal crystal faces; they contain liquid, two-phase (liquid/gas), and solid fillings identified as magnesium-bearing calcite and dolomite.A trapiche-type sapphire is also described.
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