Review of Dana's Mineralogy. 379 



Stellite. — This mineral has been described by Dr. Thomson * 

 and a mineral was mentioned by Dr. Beck in an article in this 

 Journal, (Vol. xliv, p. 54,) as identical with it, which has been 

 found at Bergen Hill, and widely circulated under the name of 

 Thomsonite. This mineral yielded to Dr. Beck's analysis, — 

 silica 54-60, lime 33-65, magnesia 6-80, oxyd of iron with a little 

 alumina 0-50, water and carbonic acid 3-20. 



" Mr. A. A. Hayes has analyzed the same mineral with quite a dif- 

 ferent result, as follows: — Silica 55-96, lime 35*12, soda 6-75, potash 

 0*60, alumina and magnesia 0-08, protoxyd of manganese 0-64, water 

 (hygrometric) 16=99-31. The large per centage of soda and the 

 proportion of silica and lime, would seem to ally the species to Pectolite, 

 from which, however, it appears to be removed by containing no water." 



" The author has compared specimens of the stellite of Bergen Hill 

 with the foreign pectolite in Mr. J. A. Clay's cabinet at Philadelphia, 

 and finds them closely similar in external character ; moreover, Fran- 

 kenheim, in a late article, makes pectolite an anhydrous mineral, sta- 

 ting that the water varies, and is not an essential ingredient." (p. 336.) 



Haydenite. Chabazius monoclinatus. — This interesting spe- 

 cies is found in company with a rare and curious modification of 

 Heulandite, which M. Levy has endeavored to establish as a dis- 

 tinct species under the name of Beaumontite, but which Mr. 

 Alger has shown (this Vol. p. 233) to be Heulandite. The Hay- 

 denite was also reestablished by Levy on crystallographic grounds, 

 but as it is still doubtful whether its primary may not be a rhom- 

 bohedron, like chabazite, instead of a rhombic prism, a chemical 

 analysis was undertaken by B. Silliman, Jr., to settle the question. 

 We copy the figure given by Mr. Dana, and from the appendix 

 the chemical examination. 



u p r i mar y form, an oblique rhombic prism, y\s. 11. 



(Levy.) M : M=98° 22', P : M=96° 5'. Clea- 

 vage : lateral and basal, perfect ; the latter 

 little the most so. Twin crystals compounded 

 parallel with P, as in the annexed figure. 



"H.=3. G=2136— 2-265, (Silliman.) Lus- 

 tre vitreous ; bright. Color brownish-, greenish-, or wine-yellow. 

 Translucent — transparent. Brittle. 



" Dissolves partially without gelatinizing in sulphuric acid, and on 

 cooling deposits crystals of alum. Fuses with difficulty before the blow- 

 pipe — tinges the outer flame violet. Heated in a glass tube alone, it 

 gives off a slight empyreumatic odor, and deposits water. — (Silliman.) 



* Outlines of Min. and Geoi. Vol. I, p. 313. 



