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the claim
The terms acidic and basic became associated with SiO2 in igneous rocks historically
the verdict
SUPPORTED
the evidence backs this
refutedsupported
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2 sources for · 0 against

Historically, the terms acidic and basic were used to classify igneous rocks based on their silica (SiO2) content during the 19th century, linking high silica to acidic and low silica to basic.

Evidence for · 2
en.wikipedia.org: Acidic rock
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Explicitly states that terms describing igneous rock composition as acidic or basic evolved in the 19th century based on silica content.
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Judged against reference works: claims of this kind are settled by the historical reference record, not journal abstracts.

More for · 1
doi.org: The Emergence of the Diversity of Igneous Rocks As A Geological Problem: Part One—Early Speculations
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Notes 19th-century geological speculations involving layers of acid and basic material, supporting the historical association with igneous rocks.
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first checked31 Jul 2026
judged → SUPPORTED · 7531 Jul 2026
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