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Block - Pair of stamps
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SCOTT NO N4072 1329
DATE OF ISSUE 2000 Jan 01
FACE VALUE 60ch
COUNTRY Democratic people's republic Korea
   
DESCRIPTION The stamp shows Graphite. It is one of the world's softest minerals. It occurs in igneous & metamorphic rocks. It is used for dry & wet lubrication & for chemical purposes. Its latest use is as a moderator to slow down neutrons in nuclear reactors.
   
   
MINERAL Other
VARIATION Error, Meter Mark, Block, Proof, First Day Cover, PC, Postal Stationery, Envelope