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SCOTT NO
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788A A188a
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DATE OF ISSUE
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1998 Nov 12
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FACE VALUE
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475fr
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COUNTRY
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Chad
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DESCRIPTION
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The stamp shows Opal. It is a noncrystalline form of silica containing water. It forms as a low temperature deposit around hot springs in veins as in Nevada.
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GEMSTONE
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Opal
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VARIATION
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Souvenir Sheet, First Day Cover, Envelope
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