The quality of being fissile; the capacity to be easily split, cracked, or broken along natural lines, especially in rocks and minerals.
From fissile + -ity (suffix forming abstract nouns); derived from Latin 'fissilis' (able to be split).
Shale has high fissility—that's why it splits naturally into thin sheets and was used for roofing for thousands of years; geology and economics meeting in one word!
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