MINERALOGY. 555 



from white to clear and colorless ; the massive mineral is white. The 

 locality of this beautiful borate is in Southern California, in the Calico 

 district, San Bernardino County, and Death Valley, Inyo County. 

 {California Acad., Bulletins Nos. 1 and 2.) 



Diadelphite. — This name was given by H. Sjogren to a manganese 

 arsenate from the Moss mines in Nordmark, Sweden, and simidtane- 

 ously the same mineral was announced by Igelstrom under the name 

 aimatolite (properly hematolite). In its method of occurrence it is like 

 allaktite described above. The crystals are small, from a fraction of a 

 millimeter to 2'""'. In form they belong to the rhombohedral division of 

 the hexagonal system, but optically they show anomalies, and Ber- 

 trand calls them pseudo-hexagonal. The color is brownish-red to gar- 

 net-red, the streak light chocolate brown. The crystals become super- 

 ficially oxidized easily, and then turn black and opaque. The hardness 

 is 3.5. The name refers to the close relation the hiineral bears to syn- 

 adelphite and the other manganese arsenates from Nordmark. {Geol. 

 For. Fork., StocMohn, vii, 210, 233, 369, ^07 ; Bull. Soc. Min. France, 

 VII, 121, 124.) 



Goyazite. — A new hydrous phosphate of aluminum and calcium, de- 

 scribed by Damour, from the diamond-bearing gravels of the province 

 of Minas Geraes, Brazil. It occurs in small rounded grains of a yellowish- 

 white color, showing one cleavage, normal to which the black cross of a 

 uniaxial crystal can be observed in the polariscope. The hardness is 5, 

 the specific gravity 3.26. The name refers to the province where the 

 principal diamond deposits occur. [Bull. Soc. 3Un., vii, 204.) 



Guifermanite. — A name given by W. F. Hillebrand, after Mr. Frank- 

 lin Guiterman, to a new metallic sulphide from the Zuui mine, near 

 Silverton, San Juan County, Colorado. It occurs intimately mixed with 

 zunyite (see below). When in the fresh state it has a bluish-gray color 

 and slight metallic luster. The hardness is about 3, the specific gravity 

 5.94. The formula deduced, after deducting the impurities present in 

 the material analyzed, is 10 PbS, 3 AS2S3. 



Memafibrite {or Hiemafihrite). — Another of the new manganese arse- 

 nates from' Nordmark, Sweden, described by Igelstrom, and named in 

 allusion to its color. It occurs in globular forms, with fibroas struct- 

 ure, mixed with magnetite and serpentine. According to Bertrand the 

 mineral is orthorhombic, with the acute positive bisectrix i^arallel to the 

 prismatic edge, and an optic axial angle of 70°. The color is blood- red, 

 to which the name given refers. Its composition is near that of allak- 

 tite, but it contains more water. {Geol. For. Fork., Stockholm^ 210, 407 ; 

 Bull. Soc. Min. France, vii, 121, 124.) 



Hematolite {or Hcemalolite). — The proper form of the name aimato- 

 lite, given by Igelstrom to the mineral also called diadelphite (which 

 see) by H. Sjogren. Keferences as for hemaflbrite above. 



Hillangsite. — Described by Igelstrom as a new mineral, but probably 

 only a variety of amphibole. It is said to resemble the anthophyllite 



