What is powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America called?
magistral — (Metal.) Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
- Canonical URL: https://worddirectanswers.com/answers/what-is-magistral-sense-5-called
- Steward: Jason Burns
- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00