TY  - BOOK
AU  - Barth, Tom F. W.
TI  -  Feldspars
U1  - 549.68 
PY  - 1969///
CY  - New York
PB  - Wiley interscience
KW  - Silicates
KW  - Mineralogy
KW  - gems
KW  - Physical properties of feldspars
KW  - Tectosilicates
ER  -