marble coarse crystalline parent rock usually

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: alline – Parent rock usually limestone – Composed of calcite crystals – Fabric can be random or oriented Marble (nonfoliated) Common metamorphic rocks Common metamorphic rocks Foliated rocks – Type formed depends on metamorphic grade – Grade depends on depth Mudstones are sediments, can be squashed by burial and/or in continent-continent collisions Change in metamorphic grade with depth Mudstone is most common sedimentary rock. When metamorphosed, rocks reveal grade: Increasing Directed Pressure and increasing Temps => Common metamorphic rocks Common metamorphic rocks Foliated rocks Slate – Very fine-grained – Excellent rock cleavage, often perp. Excellent to original to – Made by low-grade metamorphism Made of shale of Example of slate Common metamorphic rocks Common metamorphic rocks Foliated rocks Phyllite – Grade of metamorphism between slate and Grade schist schist – Made of small platy minerals – Glossy sheen with rock cleavage – Composed mainly of muscovite and/or Composed chlorite chlorite Phyllite (l) and Slate (r) lack visible mineral grains Common metamorphic rocks Common metamorphic rocks Foliated rocks Schist – Medium- to coarse-grained Medium– Comprised of platy minerals (micas) – The term schist describes the texture The describes – To indicate composition, mineral names To are used (such as mica schist) are A mica garnet schist Common metamorphic rocks Common metamorphic rocks Foliated rocks Gneiss – Medium- to coarse-grained – Banded appearance – High-grade metamorphism – Composed of light-colored feldspar Composed layers with bands of dark mafic minerals minerals Gneiss displays bands of lig...
View Full Document

Ask a homework question - tutors are online