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Metamorphic Rock
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Parent rock(s):
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Date collected, locality of origin
(attach a description, sketch,
or photograph of surroundings)
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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
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Hardness
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It will
scratch...
__ 2.5 fingernail, paper
__ 3.5 Copper penny
__ 5.5 Glass
__ 7 Porcelain streak plate (does not leave a
streak)
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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)
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Mohs'
scale
__ 1 Talc
__ 2 Gypsum
__ 3 Calcite
__ 4 Fluorite
__ 5 Apatite
__ 6 Orthoclase (potassium feldspar)
__ 7 Quartz
__ 8 Topaz
__ 9 Corundum
__ 10 Diamond
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Texture and Fracture
__ Coarse-grained
__ Medium-grained
__ Fine-grained
__ Banded (dark layers)
__ Breaks across grains
__ Breaks around grains
__ Slaty cleavage
__ Schistocity cleavage
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Other observations
Crystals visible with magnifying glass?
Yes, No
Describe:
Effervesces with HCl: ___ yes; ____
no
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Metamorphic Type
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Foliated:
__ Slate
__ Phyllite
__ Schist
__ Gneiss
__ Migmatite
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Nonfoliated:
__ Marble
__ Skarn
__ Quartzite
__ Hornfels
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Metamorphic conditions
__ Temperature:
low, intermediate, high
__ Pressure:
directed, confining, or
minimal
__ Contact with hot magma
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