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July 2013 Rock & Gem Kids

Rock & Gem Kids is a monthly feature that offers articles, puzzles, and a quiz with prizes for junior rockhounds.

The Quiz

1. Black zinc sulfide, which has a high iron content, is called marmatite or, informally, “black jack” .

2. Eurypterids belong to the sea scorpion family, but were more closely related to horseshoe crabs .

3. Sphalerite is the principal ore of zinc .

4. Minerals that come in the dendritic form are copper, silver, gold and pyrolusite.

5. Double refraction is an optical property of Iceland spar.

Mar_Kids_prizeThis month's winners
received a grab bag of
mineral and fossil
specimens.