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163-Onyx Marble $5.00
Mystery includes rock, fossil, or mineral sample and Mystery questions with teaching instructions.


-- A sample of onyx marble that is compact, banded, translucent, and WILL FIZZ IN ACID. This mystery requires calcium (or other) carbonate composition, hence travertine from limestone caves is appropriate.

-- To introduce onyx marble, a popular rock for collectors, because it is dense and takes a good polish. It is used as a decorative or architectural material or for small ornamental objects.
-- To introduce the concept of two names (onyx marble and travertine) for the same rock
-- To introduce the term, transluscent
-- To introduce the concept of caves
-- And for older students, to introduce the concept of water dissolving rock (specifically limestone) to form an opening called a cave

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Ruth Deike
Rock Detective Geoscience Education
395 Deer Run Drive
Nellysford , VA 96080

Phone: 434-263-3737



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