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Crystal - Tetrahedrite
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A Tetrahedrite crystal showing beautiful -43m symmetry.
See: "Fahlerz" fig 34 in Goldschmidt's "Atlas Der Krystallformen" (table 157, vol 3 Tafeln; publ. 1916).
https://archive.org/stream/atlasderkrystalltaf03gold#page/157/
Facet info based on Mark Holtkamp's elegant Dexter programme,
http://www.smorf.nl/index.php?crystal=Tetrahedrite_034
(He sells other beautiful crystals on Shapeways
http://www.shapeways.com/shops/smorf )
See: "Fahlerz" fig 34 in Goldschmidt's "Atlas Der Krystallformen" (table 157, vol 3 Tafeln; publ. 1916).
https://archive.org/stream/atlasderkrystalltaf03gold#page/157/
Facet info based on Mark Holtkamp's elegant Dexter programme,
http://www.smorf.nl/index.php?crystal=Tetrahedrite_034
(He sells other beautiful crystals on Shapeways
http://www.shapeways.com/shops/smorf )
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