350 Review of IS hoard's Treatise on Mineralogy, (^'c, 



(a figure of which we have given 1. c.) are shown to be identical 

 with the fibrohte of Bournon, or the Bucholzite of others, we must 

 maintain its claim to rank as a distinct species. 



Datibimte. We are at a loss to decide whether this species is 

 proposed by the author on chemical or natural history grounds ; if 

 on the former, the evidence is inadmissible by the principle laid 

 down ; if by the latter, it requires further investigation, as the re- 

 sult of Mr. Shepard's analysis is far from satisfactory. 



Goshenite. This is a new name for the same mineral which 

 the author has before described (this Journal, Vol. xxxiv, p. 329) 

 as phenakite, and which he afterward (Vol. xliii, p. 364) recalled. 

 It was first noticed by Col. Gibbs in this Journal, as a " beautiful 

 rose emerald," (Vol.1, p. 351;) it is also white and bluish. Prof. 

 Shepard considers it as belonging to the rhombohedral system, 

 and its planes seem to render it probable that the inference is cor- 

 rect. Without more perfect crystals we cannot consider it dis- 

 tinct until an analysis shall decide its composition. 



Ledererite. The sphene of Grenville, Canada, and Hammond, 

 N. Y. is still retained under this name. The greatest confusion 

 exists in most of the books in relation to the figures of this mine- 

 ral, but a comparison of the crystals from Hammond with figure 

 229 of Mohs's Mineralogy, (2d ed.) will convince the most skep- 

 tical that the identity is complete. The figure given by Prof. 

 Shepard in this Journal (Vol. xxxix, p. 357) will be seen to cor- 

 respond with the figure of Mohs, only that it is inverted and the 

 planes differently lettered.* The slight discrepancy of the angles 

 (about 1°) is no doubt due to the imperfection of the specimens 

 measured, forbidding the use of the reflective goniometer and 

 rendering the common instrument more uncertain than usual. 

 We believe Prof. Shepard is alone in maintaining this mineral as 

 a distinct species. 



Washingtonile. This name for a variety of axotomous iron 

 should not be retained, as the mineral is identical in composition 

 with the hystatite of Breithaupt. 



Chathamite. Here we have a new species proposed, on as far as 

 we can see, purely chemical grounds, and these we conceive will 

 be found untenable. But we copy the description, (p. 158.) 



* Or see this Journal, Vol. xlvi, p. 136, where this figure is placed in its normal 

 position. 



