Rutile, aragonite, cerussite, and chrysoberyl often exhibit cyclic twinning, typically in a radiating pattern.
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It commonly occurs in association with hemimorphite, willemite, hydrozincite, cerussite, malachite, azurite, aurichalcite and anglesite.
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A mineral consisting of lead carbonate that is an important source of lead
Occassionally found in small pieces, but never in sufficient quantities to form an object of mining. It occurs in irregular rounded pieces of a yellowish color, exhibiting no crystalline structure. ...