Definitions

from The Century Dictionary.

  • noun A variety of diabase distinguished by its amygdaloidal structure, the cavities being most frequently filled with calcite. Also called amyg-daloidal diabase. and by a variety of other names. See diabase and melaphyre.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology a very fine-grained igneous rock, resembling an altered basalt, containing feldspar together with chlorite, calcite, and epidote etc

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