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Igneous Rock Specimens






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. 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 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.

Andesite (small phenocrysts)

  • 10 Pack - Small [RI010b]
  • 10 Pack - Medium [RI010c]
  • 1 Large Sample [RI010d]
Item Number
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Anorthosite (gray, coarse-grained)

  • 10 Pack - Small [RI015b]
  • 10 Pack - Medium [RI015c]
  • 1 Large Sample [RI015d]
Item Number
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Basalt - Compact (gray to black, fine grained, may have a few vesicles)

  • 10 Pack - Small [RI020b]
  • 10 Pack - Medium [RI020c]
  • 1 Large Sample [RI020d]
Item Number
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Basalt - Flood (dark gray to black)

  • 10 Pack - Small [RI021b]
  • 10 Pack - Medium [RI021c]
  • 1 Large Sample [RI021d]
Item Number
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Basalt - Porphyry (hornblende phenocrysts)

  • 10 Pack - Small [RI022b]
  • 10 Pack - Medium [RI022c]
  • 1 Large Sample [RI022d]
Item Number
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Basalt - Vesicular (brown to black with abundant vesicles)

  • 10 Pack - Small [RI024b]
  • 10 Pack - Medium [RI024c]
  • 1 Large Sample [RI024d]
Item Number
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Breccia - Volcanic (angular rock fragments in groundmass)

  • 10 Pack - Small [RI030b]
  • 10 Pack - Medium [RI030c]
  • 1 Large Sample [RI030d]
Item Number
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Diorite (black and white)

  • 10 Pack - Small [RI050b]
  • 10 Pack - Medium [RI050c]
  • 1 Large Sample [RI050d]
Item Number
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Felsite (porphyry, gray)

  • 10 Pack - Small [RI054b]
  • 10 Pack - Medium [RI054c]
  • 1 Large Sample [RI054d]
Item Number
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Gabbro (coarse-grained, brown to black)

  • 10 Pack - Small [RI060b]
  • 10 Pack - Medium [RI060c]
  • 1 Large Sample [RI060d]
Item Number
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Granite - Pink to Red (medium to coarse-grained)

  • 10 Pack - Small [RI074b]
  • 10 Pack - Medium [RI074c]
  • 1 Large Sample [RI074d]
Item Number
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Granite - White to Gray (medium to coarse-grained)

  • 10 Pack - Small [RI076b]
  • 10 Pack - Medium [RI076c]
  • 1 Large Sample [RI076d]
Item Number
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Granodiorite (gray, medium to coarse-grained)

  • 10 Pack - Small [RI077b]
  • 10 Pack - Medium [RI077c]
  • 1 Large Sample [RI077d]
Item Number
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Monzonite (medium-grained)

  • 10 Pack - Small [RI078b]
  • 10 Pack - Medium [RI078c]
  • 1 Large Sample [RI078d]
Item Number
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Obsidian - Black (lustrous, conchoidal fracture)

  • 10 Pack - Small [RI080b]
  • 10 Pack - Medium [RI080c]
  • 1 Large Sample [RI080d]
Item Number
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Obsidian - Mahogany (reddish-brown and black colors, conchoidal fracture)

  • 10 Pack - Small [RI085b]
  • 10 Pack - Medium [RI085c]
  • 1 Large Sample [RI085d]
Item Number
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Obsidian - Snowflake (in black matrix, conchoidal fracture)

  • 10 Pack - Small [RI086b]
  • 10 Pack - Medium [RI086c]
  • 1 Large Sample [RI086d]
Item Number
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Pegmatite (large coarse-grained minerals)

  • 10 Pack - Small [RI087b]
  • 10 Pack - Medium [RI087c]
  • 1 Large Sample [RI087d]
Item Number
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Peridotite (medium-grained, blackish with dark green tint)

  • 10 Pack - Small [RI088b]
  • 10 Pack - Medium [RI088c]
  • 1 Large Sample [RI088d]
Item Number
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Pitchstone (medium gray to black)

  • 10 Pack - Small [RI091b]
  • 10 Pack - Medium [RI091c]
  • 1 Large Sample [RI091d]
Item Number
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Pumice (light gray)

  • 10 Pack - Small [RI090b]
  • 10 Pack - Medium [RI090c]
  • 1 Large Sample [RI090d]
Item Number
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Rhyolite (pink to gray)

  • 10 Pack - Small [RI100b]
  • 10 Pack - Medium [RI100c]
  • 1 Large Sample [RI100d]
Item Number
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Scoria (reddish-brown to dark gray)

  • 10 Pack - Small [RI110b]
  • 10 Pack - Medium [RI110c]
  • 1 Large Sample [RI110d]
Item Number
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Syenite (gray, medium-grained, no quartz)

  • 10 Pack - Small [RI115b]
  • 10 Pack - Medium [RI115c]
  • 1 Large Sample [RI115d]
Item Number
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Trachyte Porphyry (gray, porphyryitic, small to medium phenocrysts)

  • 10 Pack - Small [RI120b]
  • 10 Pack - Medium [RI120c]
  • 1 Large Sample [RI120d]
Item Number
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Tuff (light tan, fine-grained)

  • 10 Pack - Small [RI130b]
  • 10 Pack - Medium [RI130c]
  • 1 Large Sample [RI130d]
Item Number
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Volcanic Ash (light gray, very fine-grained, Mount St. Helens' ash)

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