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Eisco Andesite Specimen (Igneous Rock), Approx. 1" (3cm) - Pack of 12

  • Andesite sample approximately 1" (3cm) in size
  • Abundant phenocrysts in fine-grained matrix offer a great demonstration of igneous porphyry
  • Perfect size for use in classroom identification labs and exercises, correlates well to Next Generation Science Standards Evidence Statements
  • Texture and chemistry variation are excellent for students learning about differing cooling rates
  • Specimen comes in clear labeled and barcoded bag for ideal storage
  • Average Specimen Size - 2-3 cm

Andesite is an excellent example of porphyry in igneous rocks. The fine-grained felsic matrix contains larger, identifiable hornblende crystals, indicating two different rates of cooling. This sample can be used as a good introduction to igneous rock classification, and identifying minerals within igneous rocks.

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