Oxy-chromium-dravite

NaCr₃(Cr₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O

Trigonale root IMA approved

Skład

Composizione (% in peso)

O

Cr

Si

OOxygen43.7%
CrChromium32.1%
SiSilicon14.8%
MgMagnesium4.3%
BBoron2.9%
NaSodium2.0%
HHydrogen0.3%

Etymologia

Nazwany na cześć dravite.

Czakry wtórne