Rosieresite is an insufficiently characterized rare lead copper aluminum phosphate hydrate which occurs as amorphous, pearly, yellow-pale brown, botryoidal aggregates. An existing specimen (Arkenstone Rare Species Gallery) shows concentric layering with a radial structure indicating good crystallization. It was named in 1910 for the type locality, an abandoned copper mine at Rosiere, Carmaux, Tarn, France. It also occurs at Huelgoat, Morbihan, Brittany, France.
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