General formula:

(Ca,Na)(Si,Al)4O8

N° standard / mount: 19 / MAC
Standard elements: Al Ca Na Si
Mineral class: Silicates
Group: Feldspars
Locality: Beaver Bay, Minnesota, USA
Comments:

Homogeneous but secondary phases in cracks should be avoided during analyses
Common impurities : Fe, Mn

Analysis:
Bytownite Analysis
Bytownite