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Igneous Rock Specimens


Rocks and Minerals





Igneous rocks are formed through the cooling and solidification of magma or lava and they may form with or without crystallization. Intrusive, or plutonic, igneous rocks form when molten rock (magma) cools underground. Extrusive, or volcanic, igneous rock form when molten rock (lava) cools on the surface.


Rockman's igneous rock 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 3 standard sizes of igneous rocks listed below:

  • small hand

    Small Specimens — 0.75" to 1.2" — 10 pieces in resealable bag.


  • medium hand

    Medium Specimens — 1.25" to 1.75" — 10 pieces in resealable bag.


  • large hand

    Large Sample — 2" x 3" up to 3" x 4" — one (1) piece in a labeled box.

Andesite (hornblende phenocrysts)

  • 10 Pack - Small [RI010b]
  • 10 Pack - Medium [RI010c]
  • 1 Large Sample [RI010d]
Item Number


Anorthosite (gray, coarse grained)

  • 10 Pack - Small [RI015b]
  • 10 Pack - Medium [RI015c]
  • 1 Large Sample [RI015d]
Item Number


Basalt (gray to black, fine grained, may have a few vesicles)

  • 10 Pack - Small [RI020b]
  • 10 Pack - Medium [RI020c]
  • 1 Large Sample [RI020d]
Item Number


Basalt var. Flood (dark gray-black)

  • 10 Pack - Small [RI021b]
  • 10 Pack - Medium [RI021c]
  • 1 Large Sample [RI021d]
Item Number


Basalt Porphyry (hornblende phenocrysts)

  • 10 Pack - Small [RI022b]
  • 10 Pack - Medium [RI022c]
  • 1 Large Sample [RI022d]
Item Number


Basalt var. Vesicular (brown to black with abundant vesicles)

  • 10 Pack - Small [RI024b]
  • 10 Pack - Medium [RI024c]
  • 1 Large Sample [RI024d]
Item Number


Breccia var. Volcanic (angular rock fragments in groundmass)

  • 10 Pack - Small [RI030b]
  • 10 Pack - Medium [RI030c]
  • 1 Large Sample [RI030d]
Item Number


Diorite

  • 10 Pack - Small [RI050b]
  • 10 Pack - Medium [RI050c]
  • 1 Large Sample [RI050d]
Item Number


Felsite (porphyry-gray)

  • 10 Pack - Small [RI054b]
  • 10 Pack - Medium [RI054c]
  • 1 Large Sample [RI054d]
Item Number


Gabbro (coarse-grained, brown to black)

  • 10 Pack - Small [RI060b]
  • 10 Pack - Medium [RI060c]
  • 1 Large Sample [RI060d]
Item Number


Granite (pink to red, coarse-grained)

  • 10 Pack - Small [RI074b]
  • 10 Pack - Medium [RI074c]
  • 1 Large Sample [RI074d]
Item Number


Granite (gray-white, medium grained)

  • 10 Pack - Small [RI076b]
  • 10 Pack - Medium [RI076c]
  • 1 Large Sample [RI076d]
Item Number


Granodiorite (gray, medium grained)

  • 10 Pack - Small [RI077b]
  • 10 Pack - Medium [RI077c]
  • 1 Large Sample [RI077d]
Item Number


Monzonite (medium-grained quartz monzonite)

  • 10 Pack - Small [RI078b]
  • 10 Pack - Medium [RI078c]
  • 1 Large Sample [RI078d]
Item Number


Obsidian (black lustrous)

  • 10 Pack - Small [RI080b]
  • 10 Pack - Medium [RI080c]
  • 1 Large Sample [RI080d]
Item Number


Obsidian - Mahogany (brown and black mixture)

  • 10 Pack - Small [RI085b]
  • 10 Pack - Medium [RI085c]
  • 1 Large Sample [RI085d]
Item Number


Obsidian (snowflake)

  • 10 Pack - Small [RI086b]
  • 10 Pack - Medium [RI086c]
  • 1 Large Sample [RI086d]
Item Number


Pegmatite

  • 10 Pack - Small [RI087b]
  • 10 Pack - Medium [RI087c]
  • 1 Large Sample [RI087d]
Item Number


Peridotite

  • 10 Pack - Small [RI088b]
  • 10 Pack - Medium [RI088c]
  • 1 Large Sample [RI088d]
Item Number


Pitchstone (black)

  • 10 Pack - Small [RI091b]
  • 10 Pack - Medium [RI091c]
  • 1 Large Sample [RI091d]
Item Number


Pumice (light gray)

  • 10 Pack - Small [RI090b]
  • 10 Pack - Medium [RI090c]
  • 1 Large Sample [RI090d]
Item Number


Rhyolite (pink to gray)

  • 10 Pack - Small [RI100b]
  • 10 Pack - Medium [RI100c]
  • 1 Large Sample [RI100d]
Item Number


Scoria (reddish-brown to dark gray)

  • 10 Pack - Small [RI110b]
  • 10 Pack - Medium [RI110c]
  • 1 Large Sample [RI110d]
Item Number


Syenite (gray, medium-grained no quartz)

  • 10 Pack - Small [RI115b]
  • 10 Pack - Medium [RI115c]
  • 1 Large Sample [RI115d]
Item Number


Trachyte Porphyry (gray, porphyryitic small phenocrysts)

  • 10 Pack - Small [RI120b]
  • 10 Pack - Medium [RI120c]
  • 1 Large Sample [RI120d]
Item Number


Tuff (light tan, fine-grained)

  • 10 Pack - Small [RI130b]
  • 10 Pack - Medium [RI130c]
  • 1 Large Sample [RI130d]
Item Number


Volcanic Ash (light gray, fine-grained, Mount St. Helens' ash)

  • 1 2x2" bag [RI140b]
  • 1 3x3" bag [RI140c]
Item Number




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