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Etymol: Greek doleros, 'deceitful,' in reference to the fine-grained character of the rock that makes it difficult to identify megascopically.
Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. It can include microgabbro, basalt, andesite, microdiorite and other rock types.

i. In the United States, a syn. of diabase

Ref: AGI

ii. In British and Australian usage: A medium grained mafic intrusive rock whose main components are calcic plagioclase and clinopyroxene and which is characterized by ophitic to subophitic texture; usually found in sills and dykes [glossary item missing]. The preferred term for what is called diabase in the United States. Of similar mineralogy to basalt and gabbro, and intermediate in grainsize between them.

Compare with: diorite, trap

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Classification of DoleriteHide

Sub-divisions of DoleriteHide

Mineralogy of DoleriteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
PyroxeneA petrological term for Pyroxene Group.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Feldspar > Alkali Feldspar > K FeldsparPotassium-dominant feldspars with unknown crystal symmetry and Al-Si ordering state.
Silica > QuartzSiO2

Synonyms of DoleriteHide

Internet Links for DoleriteHide URL:
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