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Polybasite-M2a2b2c

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System:
Monoclinic

Classification of Polybasite-M2a2b2c

Crystallography of Polybasite-M2a2b2c

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group Setting:
C2/c
Cell Parameters:
a = 26.2625(4) Å, b = 15.1623(5) Å, c = 24.1061(6) Å
β = 90.045(5)°
Ratio:
a:b:c = 1.732 : 1 : 1.59
Unit Cell Volume:
V 9599 ų
Z:
16
Morphology:
Pseudohexagonal tabular, striated crystals.
Comment:
Data for very Ag-rich sample (Bindi & Menchetti, 2009). Evain et al. (2006) give (measured at 100 K) 26.188 (3), 15.1199 (18), 23.784 (3) Å, 90° (no s.u. given).

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Polybasite-M2a2b2c

Reference List:
Evain, M., Bindi, L. and Menchetti, S. (2006): Structural complexity in minerals: twinning, polytypism and disorder in the crystal structure of polybasite, (Ag,Cu)16(Sb,As)2S11. Acta Crystallogr. B62, 447-456.

Bindi, L., Evain, M., Spry, P.G. and Menchetti, S. (2007): The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules. American Mineralogist, 92, 918-925.

Bindi, L. and Menchetti, S. (2009): Adding further complexity to the polybasite structure: The role of Ag in the B layer of the -M2a2b2c polytype. American Mineralogist, 94, 151-155.

Internet Links for Polybasite-M2a2b2c

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