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 diabaseand melaphyre.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology a very fine-grained
igneous rock, resembling an altered basalt, containing feldspartogether with chlorite, calcite, and epidoteetc
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