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The iridescent fire in the opal is due to the water in the gem, opals being simply a mingling of silica (flint) and water.
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Bibliographic details
Lyttelton Times, Volume CXVII, Issue 17096, 19 February 1916, Page 10
Word Count
24Page 10 Advertisements Column 3 Lyttelton Times, Volume CXVII, Issue 17096, 19 February 1916, Page 10
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