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Mineralogical Collections
Dr.Susanne Herting-Agthe, Sekr. BH 1, Ernst-Reuter-Platz 1, D-10587 Berlin,Germany
tel ++49 (0)30 - 314 22254, fax 314 72218

 
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Tourmaline, zoned crystal, polished plate, Anjanabonoina, Madagascar
  Photo:Monika Günther
Tourmaline (Elbaite)
Na(Li,Al)3Al6[(OH)4I (BO3)3I Si6O18]   ditrigonal - pyramidal, 3m
polished plate perpendicular to the c-axis of a multicolored zoned crystal.
Anjanabonoina, Madagascar.
Long diameter:13,5 cm, weight 188,5 g.  Inv.No. 90/14.

 

crystal drawing, Tourmaline, zoned crystal

Tourmaline
principle sketch of a zoned crystal perpendicular to the c-axis.
last version: oct 2009