Sewardite
A variety of Minerals
What is Sewardite?
Sewardite is a rare arsenate mineral with formula of CaFe2(AsO4)2(OH)2. Sewardite was discovered in 1982 and named for the mineralogist, Terry M. Seward (born 1940), a professor of geochemistry in Zürich, Switzerland.
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Key Characteristics
Formation of Sewardite
Sewardite has only been found at three locations, in the Tsumeb mine in Tsumeb, Namibia, Mina Ojuela, Mapimi, Durango, Mexico, and La Mur, Las Animas mine, Sonora, Mexico. At the site in Durango, Mexico, it occurs as a dark, reddish spherules and rosettes of very thin, flaky crystals. This newly discovered mineral (confirmed as a species in 1998) has been determined as rare, since only 1–2 mg of it were found in the Tsumeb mine.
Quick Facts
Physical Properties
- Color
- Dark red to light orange
- Streak
- Reddish-brown
Chemical Properties
- Chemical Formula
- CaFe3+2(AsO4)2(OH)2
- Elements
- As, Ca, Fe, H, O
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