An amorphous brownish secondary mineral consisting of a mixture of hydrous ferric oxides, important as an iron ore.
- The phenakite is also associated with albite, limonite, smoky quartz, and topaz and is often overlooked because it resembles quartz.
- This crystal was glassy and was found associated with smoky quartz, microcline-perthite, biotite, zircon, bastnasite, and limonite after siderite.
- The associated minerals are not remarkable on the specimens; only limonite and some secondary lead minerals form in the matrix.
- Example sentences
- Lovering, Tweto, and Lovering stated that dark yellow jarosite is an abundant constituent of the limonitic and ocherous materials in the oxidized orebodies, where it is mixed with iron oxides.
- It is translucent green and forms a botryoidal layer less than 1 cm thick on a hard limonitic matrix.
- Bed 4 comprised medium grey fossiliferous mudstone with limonitic ooids and phosphatic nodules.
Early 19th century: from German Limonit, probably from Greek leimōn 'meadow' (suggested by the earlier German name Wiesenerz, literally 'meadow ore').
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