554 SCIENTIFIC RECORD FOR 1884. 



delpbite (or aimatolite=hematolite), bemafibrite (eimafibrite), synadel- 

 pbite. From tbis locality comes, too, manganostibiite, a related mineral 

 containing also antimony, and xantboarsenite is still anotber manga- 

 nese arsenate (and antimonate) from a different Swedisb locality. As 

 announced by A. Sjogren, allakite occurs in small .crystals, rarely 4 

 by 2""° in lengtb and breadth, tabular parallel to the ortliopinacoid. 

 They occur in cavities and druses, in a manganese calcite, together witb 

 fluorite, pyrocbroite, chrysolite, &c. The crystals, which are fully de- 

 scribed by H. Sjogren, are monoclinic in form and closely related to 

 pbarmacolite and vivianite. They are quite complex, showing some fif- 

 teen different planes, half of them in the prismatic zone ; the optic axes 

 lie in the plane of symmetry. The hardness is 4 to 5, the specific gravity 

 3.83 to 3.85. The crystals are strongly pleochroic, with blood-red, yel- 

 low, and bluish-green as the axial colors. The luster is vitreous, trans- 

 parent to translucent; ttie fracture is splintery. An analysis leads to the 

 formula MnaAsjOg -f 4 H2Mn02. {Geol. For. Fork., Stockholm, vii, 109, 

 220, 407.) 



Broggerite. — This name has been given by Blomstrand in honor of the 

 Norwegian mineralogist, W. 0. Brogger, to a uranium mineral, near 

 cleveite in composition — cleveite, it will be remembered, is closely allied 

 to uraninite or pitch-blende. The specimen examined by Blomstrand was 

 from the neighborhood of Moss, Norway. It formed part of an octahe- 

 dral crystal ; the mineral, consequently, like the others named, is to be 

 referred to the isometric system. The hardness was 5 to 6, the specific 

 gravity 8,73, and the color iron black. An analysis showed it to con- 

 sist of about 80 per cent, of the oxide of uranium, with 8^ per cent, oi 

 lead oxide, 5.J per cent, of thorina, and small quantities of other ele- 

 ments, including the cerium yttrium metals. The author accompanies 

 his description of this mineral with an extended discussion of the vari- 

 ous minerals containing uranium. {Geol. FUr. ForhandL, Stockholm, vii, 

 59.) 



Colemanite. — This is a new mineral of rare beauty and perfection of 

 form. It was first described by J. T. Evans, and named by him after 

 William T. Coleman, of San Francisco. Later the crystalline form has 

 been exhaustively studied by Jackson, and other contributions have 

 been made by mineralogists abroad. As shown by the analyses of 

 Evans, it is a hydrous borate of calcium, having the formula 2 CaO, 

 3B2O3 + 5 H2O, and very closely related to (if not identical with) the 

 priceite from Oregon and pandermite from the Black Sea. It occurs in 

 splendent crystals, sometimes attaining a size of 30""", lining cavities in 

 the massive mineral. They belong to the monoclinic system, and have 

 perfect clinodiagonal cleavage. In habit the crystals are near datolite, 

 and a hasty examination of them might lead to their being referred to 

 that species. The crystals are very highly modified, about forty differ- 

 ent forms having been observed, half of them on a single crystal. The 

 hardness is about 4 and the specific gravity 2.43. The crystals vary 



