Stone with silica

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Possible Answers:

OPAL.

Last seen on: NY Times Crossword 4 Aug 22, Thursday

Random information on the term “OPAL”:

Opal is a hamlet in central Alberta, Canada within Thorhild County. It is located 5 kilometres (3.1 mi) north of Highway 28, approximately 53 kilometres (33 mi) northeast of Edmonton. Originally named Rutherford after Alberta’s first premier, Alexander Cameron Rutherford but was renamed to the unique “Opal” when the first post office opened on November 15, 1912.

The population of Opal according to the 2009 municipal census conducted by Thorhild County is 24.

This Central Alberta location article is a stub. You can help Wikipedia by expanding it.

OPAL on Wikipedia