22.4 New Variety qfOrtkite, and a Mineral resembling Feldspar, 



Gehlen, and published in 1813, afforded results similar to 

 each other — very different, however, from the results obtained 

 by other analysts. The analyses of several varieties, which 

 were subjected to the rigid examination here noticed, all af- 

 forded results which coincided very nearly with the analyses 

 of Gehlen. It appears therefore that the accuracy of Gehlen's 

 analyses is pretty fully established, together with the fact that 

 the several varieties of prehnite differ in their chemical com- 

 position much less than has been generally supposed. 



Another candidate for the same degree, Mr. P. N. Seven, 

 has examined a specimen of olivine from Mount Somme, near 

 Naples. The composition of this substance, as determined by 

 Klaproth, would seem hardly to admit of its being associated 

 with chrysolite. 



The following are the results of two analyses made by 

 Mr. Seven. 



Silica 40-08 Oxyg. 20-16 40-16 Oxyg. 20-20 



Magnesia . . . 44-24 17-12 44-87 17-37 



Oxid. ferrosum 15-26 3-47 15-38 3-50 



manganos. 0-48 0-10 



Alumina. . . . 0-18 Q-IO 



100-24 100-61 



These results, so widely different from those of Klaproth's 

 analysis, clearly justify the association of olivine in the same 

 species with chrysolite. C. H. — American Journ. of Science. 



NEW VARIETY OF ORTHITE, AND A NEW MINERAL RESEMBLING 

 FELDSPAR, &C. 



Extract of a letter to Dr. Silliman from Prof. Bcrzelius of Stockholm : 

 dated July 3, 1824. 



" Nothing particularly remarkable has occurred here in 

 mineralogy, except that in the midst of the city of Stockholm 

 two minerals have been discovered, one of which appears to 

 me new, and the other is the orthite, before found only at 

 Finbo, near FahJun. For the purpose of building a church 

 upon one of the six islands which form oin- city, they cut down 

 apart of a mountain in which these minerals were found. We 

 afterwards discovered that they are found evei'y where in the 

 granite about Stockholm : as yet they are not very numerous, 

 but probably will, in the progress of time, be found abun- 

 dantly. In a box of minerals which I am sending from Count 

 Warzlmeister to Dr. Torrey, I have sent for you two speci- 

 mens : the orthite of two varieties, one of which perfectly re- 

 sembles the gadolinite, for which we at first took it ; and the 

 other, with a granular fracture, has a false appearance of 

 yttrotantalite. . The new mineral has the most perfect resem- 

 blance 



