QAP triangle
QAP triangle A three-component, modal classification scheme for igneous rocks of granitic affinity based on the relative proportions of: quartz (Q); alkali feldspar (including albite if the anorthite content is less than 5%) (A); and plagioclase feldspar (containing more than 5% anorthite (P).
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Intermediate Rock , Skip to main content Migmatite , Migmatite
A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. Veins, c… content , con·tent1 / kənˈtent/ • adj. in a state of peaceful happiness: he seemed more content, less bitter. ∎ satisfied with a certain level of achievement,… Greenstone , greenstone A low-grade, regional metamorphic rock containing actinolite, epidote, and albite, and lacking a cleavage. Greenstones form by metamorphis… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Basic Rock , basic rock Rock with a relatively high concentration of iron, magnesium, and calcium, and with 45–53% of silica by weight. Examples include gabbro, w…
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QAP triangle