MINERALOGY. 547 



Lenni, Pennsylvania, described by Cooke. Schranf writes the name 

 Lernilite, which, however, is a mistake in orthography for the form 

 above given. 



Leucochalcite. — A white mineral, with silky luster, occurring in slen- 

 der, needle-like crystals. It is essentially a hydrous arsenate of copper, 

 having a composition analogous to that of the phosphate tagilite. De- 

 scribed by Sandberger and Petersen as from the Wilhelmine mine in 

 the Spessart, Germany. 



Manganbrucite. — A manganesian variety of brucite, occurring, accord- 

 ing to Igelstrom, in granular form with hausmannite and other man- 

 ganese minerals at the Jakobsberg, Sweden. It is massive, shows no 

 cleavage, and has a honey-yellow to brownish-red color, though perhaps 

 originally nearly colorless. 



Melanotekite. — A silicate of iron sesquioxide and lead, apparently 

 related in composition to the manganese lead silicate called kentrolite 

 (see above). It occurs massive, with two cleavages ; it has a metallic 

 to resinous luster, and black or blackish-gray color. It is found with 

 native lead, and intimately mixed with magnetite and yellow garnet at 

 the remarkable mines at LSngban, in Wermland, Sweden. The same 

 locality has previously furnished two other lead silicates called hyalo- 

 tekite and ganomalite. The name melanotekite, given by Lindstrom, 

 is from [liXaq^ hlaclcj and TTjxetv, to melt. 



Molybdomenite. — A lead selenite, named by Bertrand, from noXu^SSq^ 

 lead, and p.'^^yj, moon. It occurs in thin, transparent crystalline lamellae, 

 white or slightly greenish, with vitreous luster. Obtained with other 

 selenium minerals from Cacheuta, Argentine Eepublic. 



MoNETiTE. — A mineral from the guano of the islands of Moneta and 

 Mona, West Indies, described by C. U. Shepard, sr. It occurs in mi- 

 nute triclinic crystals, confusedly aggregated, of a white or pale yellow- 

 ish color. It is intimately mixed with gypsum. An analysis, by C. U. 

 Shepard, jr., shows that it contains lime, phosphoric acid, and water, 

 and making the hydrogen basic, it is an orthophosphate. 



MoNiTE. — Another guano mineral, associated with the above mone- 

 tite, and named after the other island, Mona. It is intimately associated 

 with monetite, and occurs in an uncrystalline, earthy, slightly coherent 

 form, of a snow-white color. In composition it is a calcium orthophos- 

 phate, with one molecule of water. 



Mtrobarite. — Groth has described crystals of native barium nitrate 

 from Chili. They are in apparent octahedrons, formed of the plus and 

 minus tetrahedrons; also in twins; the crystals are colorless. The 

 name nitrobarite was suggested by H. C. Lewis. 



Kocerine. — According to a preliminary note by Scacchi, a double fluo- 

 ride of calcium and magnesium, occurring in white acicular crystals in 

 volcanic bombs in the tufa of Nocera. 



Parachlorite and proiocklorite. — General terms used by Schrauf for 

 eertain groups of chloritic substances produced by alteration. 



