TY  - BOOK
AU  - Sinkankas, John,
TI  - Gemstone and mineral data book: A compilation of data, recipes, formulas and instructions for the mineralogist, gemologist, lapidary, jeweler, craftsman and collector
AV  - QE392 S54
PY  - 1972///
CY  - New York
PB  - Winchester
KW  - Gemas
KW  - Piedras preciosas
ER  -