 |
| FOR
EXAMPLE , MANY DIFFERENT TYPES OF MINERAL OCCUR IN
IGNEOUS ROCKS , BUT ONLY ABOUT EIGHT ARE NORMALLY PRESENT
AS ESSENTIAL CONSTITUENTS OF A ROCK. LET'S ENJOY SUCH A
SIMPLE OUTLINE OF MINERALS. iwa[at]artj.net |
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Topics 人工水晶・ガイガーカウンター NEW COLUMN 標本箱の作り方 採集の心得に写真追加 黒平の金雲母 |
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