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English: Corundum (Var.: Sapphire)
Locality: Passara Gem Mine, Badulla, Badulla District, Uva Province, Sri Lanka (Locality at mindat.org)
Size: 3.0 x 1.4 x 1.2 cm.
This exceptionally sharp sapphire crystal shows flanges to the sides that reflect a rare, well-formed twinning habit. Seldom do you see such a twin in the species, and usually it is present in rather clunky crystals. Specimens this sharp are hard to get because they mostly come from the gem gravels where they have been rolled and damaged in the past. This piece, however, comes from an excavation nearby and the crystal is nearly pristine. In person, it is extremely lustrous and bright! The bottom termination extends backwards in depth, showing a SECOND twinning plane in that the bottom section is rotated 90 degrees to the main body. If you hold this in your hands, in other words, it looks in person like an airplane, with the wings (upper twin flanges) in one plane and the bottom twin (rudder analogue) rotated into another plane around the core axis. Weight is approximately 25 carats.
Deutsch: Korund (Var.: Saphir)
Fundort: Passara Gem Mine, Badulla, Badulla, Uva , Sri Lanka (Fundort bei mindat.org)
Größe: 3.0 x 1.4 x 1.2 cm.
Date before March 2010(2010-03)
Source http://www.mindat.org/photo-153503.html


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