penfieldite Min.
(ˈpɛnfiːldaɪt)
[f. the name of Samuel L. Penfield (1856–1906), U.S. mineralogist + -ite1.]
A basic lead chloride, Pb2Cl3OH, occurring as very small, usu. prismatic crystals that are colourless and transparent when pure.
| 1892 F. A. Genth in Amer. Jrnl. Sci. CXLIV. 260 While examining a lot of minerals, formed by the action of sea water on ancient slags which Mr. Geo. L. English collected at Laurion, Greece, I noticed a very few hexagonal crystals which proved to be a new species, for which I propose the name: Penfieldite, in honor to Prof. Sam'l L. Penfield the indefatigable worker in mineralogy and crystallography. 1954 Mineral Abstr. XII. 453 The stocks..of two Roman anchors recovered from the Mediterranean are covered with a crust of small crystals of anglesite, phosgenite, penfieldite, with less cerussite, hydrocerussite, and specks of metallic copper and copper stains. 1969 Ibid. XX. 144/2 Penfieldite,..from Laurium, Greece, and from Sierra Gorda, Chile, has a 11·28, c 48·65 Å. |