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Metamorphic Rock Specimens






Metamorphic rocks are rocks that have been changed either in texture or in mineral composition by the influence of heat, pressure, stress (directed pressure), chemically active solutions or gasses or some other agent without the rock passing through a liquid phase. Any rock type (sedimentary, igneous or other metamorphic) can be subjected any one or any combination of the referenced agents.

For general classification and identification, metamorphic rocks can be divided into 2 textural groups:
  • 1. Foliated - those having directional layered aspect of showing an alignment of particles like gneiss.
  • 2. Non-foiliated - those having homogeneous or massive texture like marble.
Rockman's metamorphic rock specimens are hand broken as opposed to being crushed which helps keep cleavage and fracture characteristics intact. If you are looking for a specimen that is not listed, please contact us, we may have it in stock or we may be able to locate it.


We offers the 3 standard sizes of metamorphic rocks as illustrated:

small hand

Small - 0.75" to 1.2"
10 pieces in resealable bag.
large hand

Large - 2" x 3" up to 3" x 4"
ONE (1) boxed piece.
medium hand

Medium - 1.25" to 1.75"
10 pieces in resealable bag.

Amphibolite (mostly amphibole, minor plagioclase)

  • 10 Pack - Small [RM010b]
  • 10 Pack - Medium [RM010c]
  • 1 Large Sample [RM010d]
Item Number
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Anthracite Coal

  • 10 Pack - Small [RM020b]
  • 10 Pack - Medium [RM020c]
  • 1 Large Sample [RM020d]
Item Number
paypal


Gneiss - Pink/Cream/Black (commonly banded)

  • 10 Pack - Small [RM070b]
  • 1 Large Sample [RM070d]
Item Number
paypal


Gneiss - Black and White (alternating light and dark bands)

  • 10 Pack - Small [RM071b]
  • 10 Pack - Medium [RM071c]
  • 1 Large Sample [RM071d]
Item Number
paypal


Hornfels (black, fine-grained)

  • 10 Pack - Small [RM090b]
  • 10 Pack - Medium [RM090c]
  • 1 Large Sample [RM090d]
Item Number
paypal


Marble - Pink

  • 10 Pack - Small [RM124b]
  • 10 Pack - Medium [RM124c]
  • 1 Large Sample [RM124d]
Item Number
paypal


Marble - White to Light Gray

  • 10 Pack - Small [RM128b]
  • 10 Pack - Medium [RM128c]
  • 1 Large Sample [RM128d]
Item Number
paypal


Metaconglomerate

  • 10 Pack - Small [RM130b]
  • 1 Large Sample [RM130d]
Item Number
paypal


Phyllite (light gray, very fine-grained)

  • 10 Pack - Small [RM175b]
  • 10 Pack - Medium [RM175c]
  • 1 Large Sample [RM175d]
Item Number
paypal


Quartzite - Blue/Gray/Red (darker colors)

  • 10 Pack - Small [RM150b]
  • 10 Pack - Medium [RM150c]
  • 1 Large Sample [RM150d]
Item Number
paypal


Quartzite - White to Light Gray

  • 10 Pack - Small [RM151b]
  • 10 Pack - Medium [RM151c]
  • 1 Large Sample [RM151d]
Item Number
paypal


Schist - Chlorite (dark green, some mica flakes, fine-grained)

  • 10 Pack - Small [RM168b]
  • 10 Pack - Medium [RM168c]
  • 1 Large Sample [RM168d]
Item Number
paypal


Schist - Garnet (small individual garnet crystals in fine-grained mica schist)

  • 10 Pack - Small [RM169b]
  • 10 Pack - Medium [RM169c]
  • 1 Large Sample [RM169d]
Item Number
paypal


Schist - Graphite (black, dusty, fine-grained)

  • 10 Pack - Small [RM173b]
  • 10 Pack - Medium [RM173c]
  • 1 Large Sample [RM173d]
Item Number
paypal


Schist - Mica (platy mica, some small mineral crystals, fine-grained)

  • 10 Pack - Small [RM170b]
  • 10 Pack - Medium [RM170c]
  • 1 Large Sample [RM170d]
Item Number
paypal


Schist - Tourmaline (small black tourmaline crystals in mica schist)

  • 10 Pack - Small [RM177b]
  • 10 Pack - Medium [RM177c]
  • 1 Large Sample [RM177d]
Item Number
paypal

Slate - Black

  • 10 Pack - Small [RM190b]
  • 10 Pack - Medium [RM190c]
  • 1 Large Sample [RM190d]
Item Number
paypal


Slate - Red

  • 10 Pack - Small [RM195b]
  • 10 Pack - Medium [RM195c]
  • 1 Large Sample [RM195d]
Item Number
paypal




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