Skały krystaliczne




Skały krystaliczne


1. Ogólna nazwa skał posiadających wyraźną strukturę krystaliczną, są to skały zbudowane z minerałów, których ziarna są rozwinięte w postaci kryształów. Do grupy skał krystalicznych należą skały: magmowe, metamorficzne i niektóre osadowe jak gipsy, sole, dolomity.


W skałach krystalicznych ze względu na wielkość kryształów wyróżnia się:



  • skały jawnokrystaliczne – kryształy są widoczne gołym okiem

  • skały skrytokrystaliczne – obserwację kryształów umożliwia mikroskop

  • skały porfirowe – w skrytokrystalicznym cieście skalnym tkwią pojedyncze, dobrze rozwinięte kryształy.


Termin skały krystaliczne w tym znaczeniu jest jak najbardziej logiczny i poprawny, ale zupełnie nie używany przez geologów, czyli ludzi profesjonalnie zajmujących się skałami.


2. Termin skały krystaliczne w geologii stosowany jest wyłącznie jako określenie skał magmowych (zwykle głębinowych) i metamorficznych.







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