美國 Scott 出品，原廠包裝。
包含模式硬度所列的9個標準硬度等級的礦物(不含金剛鑽)。
This collection is the traditional Mohs Scale which assigned a "hardness" to ten key minerals with talc #1 (the softest) and diamond #10 (the hardest).
The first 9 minerals are included in this set. Nine specimens approximately 1" x 1 1/2", number-coded.
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