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Pure earth does not petrify, because the predominance of dryness over [i.e. in] the earth endows it not with coherence but rather with crumbliness. In general, stone is formed in two ways only (a) through the hardening of clay, and (b) by the congelation [of waters].

Avicenna

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Avicenna
Astronomer
Chemist
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Islamic Jurist
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Pūr-i Sīnā
Aboû Alî al-Hosain ibn Abdallâh ibn Sînâ
Abitianus
Ibn Sīnā
Earth
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Hardening
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Pure
Coherence
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Waters
Rather
Clay
Water
Formed
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Stone
Dryness
Two
Stones
Predominance
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Endows

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