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List of U.S. state minerals, rocks, stones and gemstones : ウィキペディア英語版 | List of U.S. state minerals, rocks, stones and gemstones States in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however. In the chart below, a year which is listed within parentheses represents the year during which that mineral, rock, stone or gemstone was officially adopted as a State symbol or emblem. ==Table of minerals, rocks, stones and gemstones==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「List of U.S. state minerals, rocks, stones and gemstones」の詳細全文を読む
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