Mineralogical Notices, 209 



the same forms. Wohler* observed prismatic crystals which were 

 recognized as like those of oxyd of antimony by Milscherlich ; 

 while octahedral crystals are readily obtained by sublimation or 

 by sohition. [Senarmonttte is an appropriate name for this octa- 

 hedral oxyd.] 



Mineral species described by Prof. C. U. Shepard, (Proc. Amer. 

 V Assoc, 4th Meeting at New Haven, p. 311.)— 1. Dysyntribite. 



Occurs in considerable masses in St. Lawrence county, New York, 

 and has some resemblance in appearance to serpentine. It is 

 found at Rossie, and at Natural Bridge in Diana, and is usually in 

 connection with the specular iron of the region. It is massive, 

 granular, tough, almost dullj with an even splintery fracture; 

 color dark green, grayish or yellowish, sometimes mottled with 

 red and black. H.-3-5-4. G. =2-76-2'8l. B.B. in thin frag- 

 ments fuses to a white porcelainous mass. In an open tube yields 

 water, Contahis according to Prof Shepard 



Si Si Fe fl Ca, :Srg 



47-68 41-50 5-48 4*83 trace =99-49 



s. Oxygen 24-'77 19-39 1-21 4-29 



whence he deduces the formula isXi Si+Fe^ Si'+9fi. 

 [The dysyntribite is somewhat remarkable for its external re- 

 semblance to serpentine, while at the same time it is aluminous 

 m composition. The specimens are very various in appearance, 

 and look much more like a rock than a mineral species, (as might 

 be inferred from the improbable formula given,) appearing to be 

 a result, to some extent, of metamorphic action.] 



2. Riitherfordite, (ibid, p. 312.) — Occurs in crystals and grains 

 at the gold mines of Rutherford Co., North Carolina, along with 

 rutile, brookitCj zircon and monazite. Monoclinic ; M : M = 93^. 

 Cleavage, none. Fracture conchoidal ; lustre of fracture shining 

 and resinous; color yellowish brown; opake. H. = 6-5; G.=:5-58- 



^ 6'69. B.B- in a glass tube cracks, glows as if on fire, emits 



much moisture and turns yellow; alone infusible; with borax 



forms slowly a clear yellow glass. 



^ According to trials by Prof Shepard, it is supposed to contain 



titanic acid, oxyd of cerium and possibly oxyd of uranium and 

 yttria. 



3. Paracolumbite^ (ibid, p. 313.) — Occurs a mile southwest of 

 Taunton, Mass., in minute quantities in a boulder of granite con- 

 taining a peculiar greenish-white feldspar. Massive, in grains and 

 short irregular seams; iron-black, sometimes with a tinge of pur- 

 ple, and a black streak ; imperfectly metallic : opake. H. about 5. 

 From his examinations, Prof. Shepard infers that the mineral 

 seems to be composed of the oxyds of iron and uranium in com- 

 hination with a metallic acid, which is not the titanic. 



* Wohler on the dimorphism of arsenous acid, Fogg. Ann., xxvi, 1*77. 

 Second Series, Vol. XII, J^o. 35,— Sept., 1851, S7 



