MINERALOGY. 675 



alike biaxial. Between these two parts of the crystal there is a narrow 

 nearly opaque ring. The boundary lines of the six interior segments are 

 perpendicular to the prismatic planes. The optical characters of all the 

 segments correspond, the bisectrix in each being parallel to the vertical 

 axis, and the axial plane making an angle of 30° with the sides of the 

 exterior hexagon. Websky proposes to limit Damour's name to the 

 uniaxial portion, while to the rest he gives the name Eichwaldite after 

 the director of the mines of Nertschinsk who collected the crystals; it 

 seems probable, however, that both may have the same composition. 

 The crystalline form, according to Websky, is complex; in his view there 

 are present, besides the prismatic and pyramidal planes belonging to the 

 hexagonal part of the crystals, also some terminal planes belonging to 

 the interior eichwaldite which he refers to a drilling of the orthorhombic 

 system. It cannot, however, be regarded that the relations of the two 

 parts of the crystals have been fully made out. 



Manganhedenbergite. — This is another manganese mineral from the 

 same locality as igelstromite, described above. It is a grayish-green 

 pyroxenic mineral very near the variety of pyroxene, called heden- 

 bergite, and differing only in that it contains between G and 7 per cent, 

 of manganese protoxide. Its hardness is 5 and its specific gravity is 

 3.55. (Geol. For. Fork., Stockholm, VI, 499.) 



Picroepidote. — According to the examination of MM. Dainour and 

 Des Cloizeaux this is a magnesian member of the epidote group, differ- 

 ing from ordinary epidote in that the calcium is replaced by mag- 

 nesium ; this result, however, is based only upon some qualitative tests 

 by M. Dainour, and hence needs confirmation. It occurs in small 

 transparent to translucent crystals, which are white or slightly yellow- 

 ish in tint. They scratch glass, and are infusible before the blow-pipe. 

 They were too imperfect for exact determination, but according to M. 

 Des Cloizeaux correspond with ordinary epidote in form and optical 

 characters. The specimens examined were from Lake Baikal, in Siberia, 

 where they occur with diopside, calcite, dolomite, lapis lazuli, and 

 pyrite. (Bull. Soc. Min., VI, 23.) 



Eichellite. — MM. G. Cesaro and G. Despret have given the name 

 riehellite to a supposed new mineral from Eichelle, in the neighbor- 

 hood of Vise, Belgium. It occurs in compact masses of a cream -yellow 

 color, becoming ochre-yellow by alteration. The hardness is between 

 2 and 3, the specific gravity is 2. The luster is greasy or resinous to 

 earthy. An analysis yielded some doubtful results, but led the authors 

 to regard it as a hydrous fluo-phosphate of iron and calcium, with, as 

 they believe, the fluorine in combination with the iron. A more com- 

 plete examination is needed to prove that it is a new and definite 

 mineral. (Ann. ISoc. Belg. Mem., x.) 



Scovillite. — This is a hydrous phosphate of didymiuin, yttrium, and 

 other rare earths, described by Brush and Penfield (Am. J. #c, xxv, 

 459), from Salisbury, Conn. It occurs sparingly in incrustations in 



