#6

Pm

Example

Clinobarylite – BaBe2Si2O7

Crystal structure and microtwinning of a new mineral clinobarylite, BaBe2Si2O7

Rastsvetaeva R K, Chukanov N V
Doklady Akademii Nauk 388 (2003) 205-207
CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=14391.cif&down=cif

 

 

Crystal structure drawn with VESTA
K. Momma and F. Izumi, J. Appl. Crystallogr.  2011, 44, 1272-1276.

Ba – green
Be – blue
Si – orange

BeO4 tetrahedra
SiO4 tetrahedra

3D rotatable model of Clinobarylite