high-alumina basalt
high-alumina basalt An aphyric, extrusive igneous rock of basaltic composition containing a high proportion of modal plagioclase, and an alumina content of more than 17 wt.%. Tholeiitic and calc-alkali basalts (see THOLEIITE; and CALCALKALINE) can have alumina contents of more than 17 wt.%, so the term does not refer to a specific basalt type. Rather, the variety of basalt should be specified, e.g. ‘high-alumina basalt of calc-alkali type’.
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content , con·tent1 / kənˈtent/ • adj. in a state of peaceful happiness: he seemed more content, less bitter. ∎ satisfied with a certain level of achievement,… Intermediate Rock , Skip to main content labradorite , high-potassium basalt An igneous rock of basaltic composition characterized by the appearance of sanidine as well as labradorite in the groundmass, a… Content Provider , Content providers are generally perceived to be Web sites that supply different types of online information—including news, entertainment, traffic re… Plotless Sampling , Skip to main content
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high-alumina basalt