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      The metamorphic rocks are derived from pre-existing sedimentary and magmatic rocks by mineralogical, chemical, and structural changes, essentially in the solid state, in response to marked changes in temperature and/or pressure (both hydrostatic and oriented), during deeper burial into deeper parts of the Earth´s crust. During these processes parallel orientation of newly formed minerals generally forms (schistosity). Hydrothermal metamorphism represents a special type, because it is related to the migration of solutions near ore veins. Contact metamorphism results from temperature effect near contact with magmatite bodies.

turmalinovec /turmalin. fylit/

No. of sample:	g3538
Rock:	fylit, metamorfity
Description:	jeden kus
Localization:	z. od Horní Blatné
Author:	leg. Komárek,1962
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