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053-Onyx $9.00
Mystery includes rock, fossil, or mineral sample and Mystery questions with teaching instructions.

-- A sample of onyx that shows distinct parallel fine bands, and DOES NOT FIZZ IN ACID. Varieties of banded agate with straight, parallel bands are also called onyx. This mystery requires chalcedonic composition, hence travertine is not appropriate. See Mystery #163 for onyx marble or travertine

Teaching Objectives:
-- To introduce onyx, a popular rock for collectors
-- To introduce the concept of two names for the same rock
-- To introduce the concept of varieties of the same mineral
-- To illustrate that window glass and onyx are in the same family of minerals (composed of silica and oxygen) loosely called quartz, and that they donít fizz in acid.

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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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