A dense, hard, dark brown-to-black volcanic igneous rock, consisting of feldspar and mafic minerals such as augite or olivine.
This term has 61 records attributed within our system.
E.641.1954
E.500.1932
E.3.1946
E.GA.2848.1943
E.75.1954
Loan Ant.103.252
ANE.3.2005
ANE.6.1975
E.GA.4341.1943
E.36.1887
ANE.19.1969
GR.47k.1901
GR.47h.1901
E.SC.289
ANE.O.34
GR.7.1979
E.GA.4014.1943
E.11.1922
E.714.1954
E.2.1974
E.3.1865
E.716.1954
E.721.1954
E.539.1954
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