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MFA Acc. #: 1999.214


Rocks that solidified from a hot, molten matrix such as Magma or Lava. When the magma cools slowly, individual components can crystalline and form coarse-grain rocks, such as Granite, Diorite, Basalt, and Syenite. When the magma or lava cools quickly, fine-grain minerals and glass-like rocks, such as Rhyolite and Obsidian, are formed.

Synonyms and Related Terms

igneo (Esp., Port.); ignée (Fr.); Magmatisch (Deut.)


  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
  • Anne Grimmer, Glossary of Building Stone Terms, A Glossary of Historic Masonry Deterioration Problems and Preservation Treatments, National Park Service, Washington DC, 1984
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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