121 



Appendix. 



Dahllite СаСО.^-ЧСа^{РО^)^- \H.^0 Hexagonal? 

 Staffelite CaCO.^ • Ca^{PO^).^F' H,_0 — 



Rivotite contains Sb^O.^, CO^, CuO 



New examinations of Scliizolite. 



Schizolite was described by Chr. Winther M on material 

 gathered by Flink in 1897, and called by him «pink columns» ^). 

 The locality is Tutop Agdlerkofia. From this description 

 the mineral was seen to be monoclinic , very closely allied to 

 pectolite. Perfect crystals were not found ; the axial ratios were 

 calculated by means of combination striæ in two directions on 

 a[lOO} consisting of two orthodomes and a prism; further the 

 monoclinic crystalline form was inferred from the fact that the 

 directions of extinction on each of the two cleavage faces 

 a {100} and 6'(00l} were parallel to the other direction of 

 cleavage. Further another form of the mineral from Nauja- 

 kasik was examined, called Schizolite var. A., which by Flink 

 was called « cubelike crystals», which form, however, in all 

 essentials, resembled the principal type. 



By a closer examination of better crystallographic material, 

 however, the mineral has proved to be triclinic; besides the 

 mentioned peculiar fact that parallel extinction is found on the 

 two cleavage directions, the feature of the axial angle a not 

 differing much from 90°, by which fact the two mentioned 

 directions of combination striae on a(lOO} get a mutual posi- 

 tion at right angles, has necessarily produced the idea of 

 monoclinic symmetry. The prismatic face Д{б10} mentioned 



') Schizolite, a new mineral. Medd. om Grønl. XXIV, p. 19f5. 

 2) Medd. om Gronl XIV, p. 257. 



