One of the mysteries of the English language finally explained.
- another term for dolerite
- ‘It is also a widespread constituent of a variety of igneous and metamorphic rocks and is occasionally found in pegmatites and in related veins marginal to igneous rock units ranging from granite to diabase.’
- ‘The lower series consists of alternating basalt lava, tuff breccia, tufite, and siliceous rock, whereas the upper one is dominated by diabase.’
- ‘Many such dikes in western Maine are classified as alkali diabase.’
- ‘If natural stone, such as basalt or diabase, is used, the product is called rock wool.’
- ‘Intrusion of diabase at Mt. Butters has resulted in low-grade contact metamorphism of the pre-existing sedimentary strata.’
Mid 19th century (originally denoting diorite): from French, formed irregularly as if from di- ‘two’ + base ‘base’ (thus ‘rock with two bases’, referring to the base minerals of diorite), but associated later perhaps with Greek diabasis ‘transition’.
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