MimetitePb5(AsO4)3ClLocality:Rouez mine, Sarthe, Pays de la Loire, France1.14 mm group of Mimetite c
MimetitePb5(AsO4)3ClLocality:Rouez mine, Sarthe, Pays de la Loire, France1.14 mm group of Mimetite crystals. Collection & photo Matteo ChinellatoIt is a secondary mineral found in the oxidized zones of lead mineral deposits, and in other settings where lead and arsenic occur together. Piezoelectric. Soluble in HNO3 and KOH. Forms pseudomorphs after an unknown mineral (possibly Anglesite ). Industrially, mimetite is a minor ore of lead. The chief use of mimetite is as a collector’s specimen, often creating attractive botryoidal crusts on the surface of the specimen. Though mimetite is also found in prismatic crystal forms, it is not used as a gemstone due to its softness (3.5 - 4). -- source link
#mimetite#france#science#minerals#crystal