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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
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Pūr-i Sīnā
Aboû Alî al-Hosain ibn Abdallâh ibn Sînâ
Abitianus
Ibn Sīnā
Rather
Clay
Water
Formed
Science
Stone
Dryness
Two
Stones
Predominance
Doe
Rocks
Endows
Earth
General
Hardening
Way
Pure
Coherence
Ways
Waters

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