Metamorphic Rocks

Key info on the texture and structure of metamorphic rocks

HideShow resource information

Metamorphic Rocks

Size

Regional

Coarse - Gneiss

Medium - Schist

Fine - Slate

All formed from regional metamorphism of mudstones and shales.

Contact

Marbles and metaquartzites become coarser the closer they are to the intrusion.

Mudstones/shales

hot = hornfels

warm = spotted slate.

Porphyroblastic

Large crystals e.g. Garnet surounded by finer crystals e.g. micas in a Garnet Mica Schist

1 of 4

Shape

12 sided/Rhombic faced

Garnets can be well formed

2 of 4

Orientation

Random in contact metamorphisim

Foliated in regional metamorphism

High Grade foliation = Gneissose Banding

Medium Grade Foliation = Schistosity

Low Grade Foliation = Slatey Cleavage

Preferred orientation

3 of 4

Texture

Texture =

SIZE

SHAPE

ORIENTATION

4 of 4

Comments

No comments have yet been made

Similar Geology resources:

See all Geology resources »See all resources »