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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.

ortorula

No. of sample:	g6503
Rock:	ortorula, metamorfity
Description:	jeden kus
Localization:	Dvorce u Borovan
Author:	leg.Geol.p. 1967
Comment:	moldanubikum - jednotvárná série česká větev

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