Ceramics-Silikáty 41 (3) 98-104 (1997) 

CRONSTEDTITE-1M AND CO-EXISTENCE OF 1M AND 3M POLYTYPES 

S. Ďurovic

An individual single crystal of cronstedtite-1M has been identi­fied in a specimen from Eisleben (Saxony). Its quality, however, does not allow for a structure refinement. If cronstedtite-1M co­exists with cronstedtite 3T in the same crystal, it "monoclinizes" its single-crystal diffraction pattern. These two polytypes can­not be distinguished by powder diffraction. 

[Back]