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Metamorphic Rock Specimens


Rocks and Minerals





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 specimens are hand broken as opposed to being crushed which helps keep cleavage and fracture characteristics intact. This is a partial lists. 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 4 standard sizes of metamorphic rocks listed below:
  • Small Chips range in size from 0.50" to 0.75" and come in a pack of 30 in a resealable bag.

  • Medium Specimens range in size from 0.75" to 1" and come in a pack of 10 in a resealable bag.

  • Large Specimens range in size from 1.25" to 1.75" and come in a pack of 10 in a resealable bag.

  • Hand Specimens range in size from 2" x 3" up to 3" x 4", each piece is in a labeled box.


Amphibolite (mostly amphibole minor plagioclase)

  • 30 Pack - Chips[RM010a]
  • 10 Pack - Medium [RM010b]
  • 10 Pack - Large [RM010c]
  • 1 Large Sample [RM010d]
Item Number


Anthracite Coal

  • 30 Pack - Chips [RM020a]
  • 10 Pack - Medium [RM020b]
  • 10 Pack - Large [RM020c]
  • 1 Large Sample [RM020d]
Item Number


Gneiss (pink, cream and black banded)

  • 30 Pack - Chips [RM070a]
  • 10 Pack - Medium [RM070b]
  • 10 Pack - Large [RM070c]
  • 1 Large Sample [RM070d]
Item Number


Diorite Gneiss (alternating light and dark bands)

  • 30 Pack - Chips [RM071a]
  • 10 Pack - Medium [RM071b]
  • 10 Pack - Large [RM071c]
  • 1 Large Sample [RM071d]
Item Number


Hornfels (black, fine-grained)

  • 30 Pack - Chips [RM090a]
  • 10 Pack - Medium [RM090b]
  • 10 Pack - Large [RM090c]
  • 1 Large Sample [RM090d]
Item Number


Marble (pink)

  • 30 Pack - Chips [RM124a]
  • 10 Pack - Medium [RM124b]
  • 10 Pack - Large [RM124c]
  • 1 Large Sample [RM124d]
Item Number


Marble (white, coarse-grained)

  • 30 Pack - Chips [RM126a]
  • 10 Pack - Medium [RM126b]
  • 10 Pack - Large [RM126c]
  • 1 Large Sample [RM126d]
Item Number


Marble (white to gray, fine-grained)

  • 30 Pack - Chips [RM128a]
  • 10 Pack - Medium [RM128b]
  • 10 Pack - Large [RM128c]
  • 1 Large Sample [RM128d]
Item Number


Metaconglomerate (limited supply)

  • 10 Pack - Medium [RM130b]
Item Number


Phyllite (very fine-grained, light gray)

  • 30 Pack - Chips [RM175a]
  • 10 Pack - Medium [RM175b]
  • 10 Pack - Large [RM175c]
  • 1 Large Sample [RM175d]
Item Number


Quartzite (blue-gray, fine grained)

  • 30 Pack - Chips [RM150a]
  • 10 Pack - Medium [RM150b]
  • 10 Pack - Large [RM150c]
  • 1 Large Sample [RM150d]
Item Number


Quartzite (white to light gray)

  • 30 Pack - Chips [RM151a]
  • 10 Pack - Medium [RM151b]
  • 10 Pack - Large [RM151c]
  • 1 Large Sample [RM151d]
Item Number


Chlorite Schist (dark green, fine grained)

  • 30 Pack - Chips [RM168a]
  • 10 Pack - Medium [RM168b]
  • 10 Pack - Large [RM168c]
  • 1 Large Sample [RM168d]
Item Number


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

  • 30 Pack - Chips [RM169a]
  • 10 Pack - Medium [RM169b]
  • 10 Pack - Large [RM169c]
  • 1 Large Sample [RM169d]
Item Number


Graphite Schist (fine-grained, black dusty)

  • 30 Pack - Chips [RM173a]
  • 10 Pack - Medium [RM173b]
  • 10 Pack - Large [RM173c]
  • 1 Large Sample [RM173d]
Item Number


Mica Schist (fine-grained, platy muscovite mica)

  • 30 Pack - Chips [RM170a]
  • 10 Pack - Medium [RM170b]
  • 10 Pack - Large [RM170c]
  • 1 Large Sample [RM170d]
Item Number


Staurolite Schist (staurolite crystals in mica schist, some twinned)

  • 30 Pack - Chips [RM176a]
  • 10 Pack - Medium [RM176b]
  • 10 Pack - Large [RM176c]
  • 1 Large Sample [RM176d]
Item Number


Slate (black to gray)

  • 30 Pack - Chips [RM190a]
  • 10 Pack - Medium [RM190b]
  • 10 Pack - Large [RM190c]
  • 1 Large Sample [RM190d]
Item Number


Slate (red)

  • 30 Pack - Chips [RM195a]
  • 10 Pack - Medium [RM195b]
  • 10 Pack - Large [RM195c]
  • 1 Large Sample [RM195d]
Item Number




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