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Argilas Catarinense » Argila

Argila

Formada pela alteração de certas rochas, como as que tem feldspato, a argila pode ser encontrada próxima de rios, muitas vezes formando barrancos nas margens. É uma família de minerais filossilicáticos hidratados, aluminosos de baixa cristalinidade e diminutas dimensões (partículas menores do que 1/256 mm ou 4 µm de diâmetro), como a caolinita, esmectita, montmorillonita, illitas, etc. Apresentam-se geralmente estáveis, nas condições termodinâmicas e geoquímicas da superfície terrestre ou de crosta rasa.

No solo a fração de argila, componente comum das lamas ou barro, como são conhecidos popularmente, é constituída de minerais desse grupo das argilas aos quais agregam-se hidróxidos coloidais floculados e diversos outros componentes cristalinos ou amorfos. O termo argila também é usado na classificação granulométrica de partículas.


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