Crèa
Ła crèa, a olte tałianisà co el tèrmino de argiła ła xe on depòxito chel vien de ła desconpoxision de łe roce che łe contien feldspato, par exenpio granito, orijinada en un proceso naturałe de tenpo variàbiłe de diexine de mile de ani. Na olta generà, ła crèa ła se produxe so łixiviasion a orixonti de acumułasion.
Caraterìsteghe
Fìxicamente ła se considera un cołòide, de partícoła estremamente picenina e superfixie łisa. El diàmetro de łe partìcołe el ga da èsar inferior a 0,002 mm. En ła frasion texturałe crèa ła pol gaver partìcołe no minerałi, i fitołiti. Chìmegamente el xe un siłicà idratà de aluminio, co fòrmuła:
Altri projeti
Wikimedia Commons el detien imàjini o altri file so crèa
el detien schemi gràfeghi so
| Controło de autorità | LCCN (EN) sh85026864 · BNF (FR) cb11934795w (data) · NDL (EN, JA) 00568080 |
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