250 Scientific Intelligence. 



bisectrix probably coincides with the orthodiagonal axis; axial 

 angle about 90°. Mean refractive indices 1-6413 for yellow, and 

 1-6305 for green. Specific gravity, 4-39. The composition is 

 that of normal barite, BaS0 4 . The close similarity between the 

 two substances in cleavage form makes a more thorough knowl- 

 edge of their relation to be desired. The mineral is named after 

 M. Michel Levy.— (7. R., cviii, 1126, May 27, 1889. 



Flinkite. A hydrous manganese arseniate from the Harstig 

 mine, Pajsberg, Sweden, described by A. Hamberg. It occurs 

 in orthorhombic crystals, tabular parallel to the base, often 

 grouped in feather-like aggregates. Hardness, 4-5. Specific 

 gravity, 3*87. Color, greenish brown. An analysis gave: 



As 2 5 Sb 2 5 MnoOs Fe 2 3 MnO CaO MgO H 2 

 29-1 2-5 20-2 1-5 35-8 0"4 VI 9-9 =1011. 



For this the formula 4H 2 0.4MnO.Mn 2 3 .As„Q 3 is calculated, which 

 brings it very near synadelphite. Named after the Swedish min* 

 eralogist G. Flink.— Geol. Mr. Fork., xi, 212, 1889. 



Daviesite. A new oxychloride of lead from Sierra Gorda, 

 Chili, named by L. Fletcher after Thomas Davies of the British 

 Museum. It was observed associated with percylite and caraco- 

 lite in minute prismatic crystals. These are clear and colorless 

 and have an adamantine luster. The axial ratio is a : b : c= 

 1-2594: 1 : 0'6018. A qualitative analysis was impossible, but 

 the crystallographic examination showed that the mineral was not 

 to be united with any of the other known lead oxychlorides. — Min. 

 Mag., viii, 171, May, 1889. 



Dudgeonite. A hydrous arseniate of nickel named by Heddle 

 after Mr. Dudgeon who discovered it at the Pibble mine, near 

 Creetown, Kilcudbrightshire, Scotland. It is a dull, loosely 

 coherent earthy mineral of grayish white color with spots of pale 

 pink or green, and resinous luster; hardness, 3-3-5. An analysis 

 gave: 



As 2 6 NiO CoO CaO H 2 



39-33 25-01 0-76 9"32 25-01=99-43. 



This corresponds to an annabergite with one-third the nickel 

 replaced by calcium. — Ibid., p. 200. 



Hydroplttmbite. A name given by Heddle to a supposed lead 

 hydrate known on a single specimen, probably from Leadhills 

 It is inferred to be 3PbO.H 2 0, but the examination is too incom- 

 plete to allow of any definite conclusion. — Ibid., p. 201. 



Plumbonacrite. A name suggested by Heddle for a hydrous 

 lead carbonate from Wanlockhead, near the hydrocerussite of 

 Nordenskiold. An analysis gave : 



CO, PbO H 2 Insol. 



| 4-76 92-85 201 0-78=100-40. 



Asthochroite. A silicate of magnesium, calcium and manga- 

 nese from Jakobsberg, Sweden, described by L. J. Igelstrom. 

 It occurs with brannite in massive forms, having a fine granular 

 or indistinctly crystallized structure. The color is rose-red or 

 violet ; the hardness, 5 to 6. An analysis gave : 



