Metamorphic Rock

 

Parent rock(s):

 

 

Date collected, locality of origin
(attach a description, sketch,
or photograph of surroundings)

 

Fabric and Shine

__ Foliated (regional metamorphism)
__ Not foliated (contact metamorphism)

__ Sugary sparkle from calcite cleavage
__ Shiny, micas visible
__ Glittery or shiny, micas not visible
__ Not shiny, micas not visible

Hardness

It will scratch...

__ 2.5 fingernail, paper
__ 3.5 Copper penny
__ 5.5 Glass
__ 7 Porcelain streak plate (does not leave a streak)

It is scratched by...

__ 2.5 fingernail
__ 3.5 Copper penny
__ 5.5 Glass, knife blade
__ 6.5 Hardened nail
__ 7 Porcelain streak plate (leaves streak)

Mohs' scale

__ 1 Talc
__ 2 Gypsum
__ 3 Calcite
__ 4 Fluorite
__ 5 Apatite
__ 6 Orthoclase (potassium feldspar)
__ 7 Quartz
__ 8 Topaz
__ 9 Corundum
__ 10 Diamond

Texture and Fracture

__ Coarse-grained
__ Medium-grained
__ Fine-grained
__ Banded (dark layers)

__ Breaks across grains
__ Breaks around grains
__ Slaty cleavage
__ Schistocity cleavage

Other observations

Crystals visible with magnifying glass? Yes, No
Describe:

Effervesces with HCl: ___ yes; ____ no

Metamorphic Type

Foliated:
__ Slate
__ Phyllite
__ Schist
__ Gneiss
__ Migmatite

Nonfoliated:
__ Marble
__ Skarn
__ Quartzite
__ Hornfels

Metamorphic conditions

__ Temperature: low, intermediate, high

__ Pressure: directed, confining, or minimal

__ Contact with hot magma