Basaltfus101andltRbiłio XSsara!ca 89ai

Basalt de Sant Tibèri, en Occitània.

Lo basalt, dit popularament pèira negra, es una ròca magmatica extrusiva comuna, eissida del refrejament de la lava basaltica al contacte de l'aire o de l'aiga a la superfícia de la planeta. Per definicion, basalt es una ròca magmatica afanitica amb mens de 20% de qüars e mens de 10% de feldspar en volum, e ont al mens 65% del feldspar es jos forma de plagioclasa. (En comparason, lo granit conten mai de 20% de qüars en volum) Basalt es generalament de color gris a negre, mas ven lèu lèu maron o roge rovilh pr'amor de l'oxidacion dels mafic (ric en fèrre) que conten en rovilh.

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