TY  - BOOK
AU  - Petersen,Christine
TI  - Groovy gems
T2  - Checkerboard Science Library. Rock on! A look at geology
SN  - 9781604537437 (alk. paper)
AV  - QE392.2 .P48 2010
U1  - 553.8 22
CY  - Edina, Minn.
PB  - ABDO Pub. Co.
KW  - Gems
KW  - Juvenile literature
KW  - Precious stones
N1  - Includes index; Erasmus's lucky pebble -- What is a gem? -- Most gems are minerals -- Six crystal systems -- Magma gems -- Water gems -- Living gems -- Imitations and synthetics  -- Cultured pearls -- Working with gems -- Then and now
ER  -