Geology and Natural History, 83 



2 mm long and -| mm thick, in plates and radiating columns and also 

 in massive form. It is transparent and of a faint green color. 

 On heating it turns first gray, then black, and finally yellow. 

 Water is given off at 120°. The analysis gave : FeO = 18*07 ; 

 CaO = 27-77; P 2 5 = 35-51 ; H 2 = 18-47 ; alkalies, a trace; 

 total = 99*82. The formula derived from these results is : FeCa 9 

 (P0 4 ) 2 *4H 2 0. The mineral is easily soluble in HC1 and HN0 3 . 

 H = 3-4. Sp. gr. = 2-81. Crystallization is triclinic, a: b : c = 

 0*87566 : 1 : 0*59753, a = 132° 22', (3 = 106° 47', y = 83° 28'. Ana- 

 pite is closely related to messalite but is not identical with it. — 

 Sitz.-Ber. preuss. Akad. d. Wissensch., Berlin, 1902, p. 18-21. 



Chalmersite. This new sulphide, which is described by E. 

 Httssak, is a member of the chalcocite group. . It was found in 

 the gold mine "Morro Velho," in Minas Geraes, Brazil, where it 

 occurs intimately associated with pyrrhotite and chalcopyrite. 

 It is orthorhombic in crystallization with the axial relations 

 a :b:e = 0*5734 : 1 : 0*9649, which are very close to those of chal- 

 cocite. The common forms found on its crystals are m(110), 

 fl (010), c(001),^ (HI), ^(011) and, more rarely, a (100). When 

 the crystals appear doubly terminated they show a hemimorphic 

 development having a base at one end and various pyramid and 

 dome faces at the other. Simple crystals are rare, twins with the 

 twinning plane m being most common. Contact and cruciform 

 twins are rarer. The crystals are almost always prismatic, occur- 

 ring in needle-like forms. The faces of the prism zone are strongly 

 striated vertically. It has no cleavage ; hardness = 3*5. Luster 

 is metallic, color bronze yellow, often with a brilliant tarnish. It 

 is strongly magnetic. Specific gravity = 4*68. The quantitative 

 analysis by W. Florence gave, Fe = 46*95 ; Cu = 17*04 ; S = 

 35*30 ; total = 99*29, which yields the ratio of Fe : Cu : S = 3 : 1 : 4. 

 From this is derived the formula : Cu 2 Fe 6 S 8 or Cu 2 S*Fe 6 S 7 . Named 

 after G. Chalmers, superintendent of the " Morro Velho " mine. 

 — Gentralblattf. Min., Geol. u. Palaeon., No. 3, 1902, p. 69. 



Koenenite. This mineral, which occurs at Volpriehausen in 

 Soiling, is described by F. Rinne. It is of a red color resembling- 

 some varieties of carnallite, from which it differs, however, in 

 having a fine cleavage. Specific gravity is 1*98. Its crystalliza- 

 tion is hexagonal rhombohedral. The analyses show it to be an 

 aluminum, magnesium oxychloride, with varying amounts of 

 water. The formula is Al 2 3 '3MgO*2MgCl 2 with 8 or 6 H 2 0. 

 Named after Dr. A. v. Koenen. — Gentralblatt f. Min., Geol. it. 

 Palaeon., No. 16, 1902, p. 493. w. e. f. 



2. New Forms on Sperrylite / by Goldsmith and Nicol. [/* 

 (Communicated.) — The following new forms have been observed 



on crystals of sperrylite from the original locality, " Vermilion 

 Mine," Algoma, Ont.: b, 203 ; g, 205 ; a, 103; k, 114 ; m, 113 ; 

 q, 112 ; B, 335 ; and u, 212. 



3. Recherches geologique et petrographique sur V Oural du 

 Nord dans la PastessJcaya et KizelovisJcaya-Datcha {Perm, 

 Kiissie) ; par L. Duparc et F. Pearce. (Mem. Soc. Phys. et 

 d'Hist. nat. de Geneve, vol. xxxiv, fas. 2, 4°, pp. 218, pi. 4 and 



