#155

#155

R32

Example – Tincalconite, Na6[B4O5(OH)4]3 • 8 H2O

Named for tincal (borax) and konos “powder” in allusion to the minerals composition and appearance.

The crystal structure of Tincalconite

Giacovazzo C, Menchetti S, Scordari F
American Mineralogist 58 (1973) 523-530

 

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=00394.cif&down=cif

Tincalconite 

BO3 trigonal-planar units and BO4 tetrehedra (pink)
NaO6 distorted octahedra (orange)

Water partially disordered.

 

3D rotatable model of Tincalconite

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