plancheite Min.
(ˈplɑ̃ʃeɪaɪt)
Also planchéite.
[a. F. planchéite (A. Lacroix 1908, in Compt. Rend. CXLVI. 724), f. the name of M. Planche, who provided ‘les meilleurs des matériaux étudiés’: see -ite1.]
A blue, fibrous, hydrous silicate of copper.
| 1908 Chem. Abstr. II. 1675 Plancheite..is a new hydrous copper silicate and is found at the copper mine of Mindouli [French Congo]. 1920 Brit. Mus. Return 145 in Parl. Papers XXXVI. 673 Copper and uranium ores from Katanga, Congo, including..plancheite, dioptase, malachite, chrysocolla, &c. 1968 Mineral. Abstr. XIX. 54/1 Planchéite occurs in the iron deposit of Capo Calamita, Elba, where it was found in the form of small masses with a radial fibrous structure, associated with dioptase and chrysocolla. 1971 Ibid. XXII. 219/2 The planchéite formula may be written as a cupric amphibole, Cu7Si8O22(OH)2. |