美國 Scott 出品，原廠包裝。
本組含6個不同裂面的標本。
礦物的裂面，是鑑定礦物一個很重要的依據，每種礦物或岩石斷裂均有特定裂面。
Some minerals (and rocks) do not demonstrate a parting or cleavage along specific planes, but they do have a consistency in how they break.
The resulting surfaces are described as conchoidal (obsidian), uneven (hornblende), etc.
The important types of fracture are demonstrated with this collection. 6 specimens approximately 1 1/2" x 1 1/2", number-coded.
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