Coarse-grained igneous rocks contain measurable amounts of feldspar

the verdict

COMMON KNOWLEDGE

Legacy classification; evidence review pending

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Is it true that Coarse-grained igneous rocks contain measurable amounts of feldspar?

Coarse-grained igneous rocks (such as granite, diorite, and gabbro) inherently contain feldspar as a primary essential mineral by definition, making this a matter of basic petrology and common geological knowledge that requires no citation.

Verdict: COMMON KNOWLEDGE · 0 sources for, 0 against · Last checked 4 Aug 2026

The analysis

The claim states that coarse-grained igneous rocks contain measurable amounts of feldspar. Feldspar is the most abundant group of rock-forming minerals in the Earth's crust and is a defining constituent of common phaneritic (coarse-grained) igneous rocks like granites, syenites, diorites, and monzonites. This is a matter of standard scientific definition and everyday petrological observation. Therefore, it is classified as common knowledge, and no citation is needed.

What does the evidence say?

Receipt History

first checked04 Aug 2026

judged → COMMON KNOWLEDGE · 9504 Aug 2026

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