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RM3380   Pleonast, An Fe²⁺-bearing (ferroan) variety of spinel
#2772
Betroka District, Anosy, Madagascar

Good size crystal of pleonast, a variety of spinel containing Fe²⁺. It shows complex crystalline forms of the octahedron and combinations of the octahedron with the dodecahedron or, more rarely, with those of the cube. A museum size piece, very rare to get.

Size: 7.8 x 6.8 x 5.6 cm.
Museum sample.
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