Geology and Mineralogy. 397 



also a glossary of the terms of the new classification. The work 

 cannot fail to exert a permanent influence on the advancement of 

 petrographic science. l. y. p. 



5. Calif or nite {Vesumanite\^ — a new ornamental stone; by 

 George F. Ktji^z. (Communicated.) — A discovery has been 

 recently made in California of a mineral which promises well as 

 an addition to the increasing list of semi-precious or ornamental 

 stones found in the United States. It is not indeed a new min- 

 eral species, but a compact massive variety of vesuvianite (ido- 

 crase). The discovery was first announced in the report of the 

 U. S. Geological Survey for 1901, by the writer.f The mineral 

 was found b}^ Dr. A. E. Heigh way, on land owned by him on the 

 South Fork of Indian Creek, 12 miles from Happy Camp and 90 

 miles from Yreka, in' Siskiyou County. Here a hard and hand- 

 some stone, varying from olive- to almost grass-green, and tak- 

 ing a fine polish, outcrops for some 200 feet along a hillside 

 about 100 feet above the creek, and large masses have fallen into 

 the bed of the creek below. It was at first supposed to be jade 

 (nephrite), but proves upon analysis to be vesuvianite. The 

 fallen pieces were in some cases as much as five feet square and 

 two feet thick, of excellent quality for polishing, and of varying 

 shades of light to dark green. The associated rock is precious 

 serpentine. 



This substance closely resembles a mineral from the south side 

 of the Piz Longhin, in the Bergellthal, also found in rolled 

 pieces in the bed of the stream called the Ordlegna, near Casac- 

 cia, in the Upper Engadine. These were at first taken for jade- 

 ite,I but were positively identified as vesuvianite by the analysis 

 of Berwerth.§ It seems at first remarkable that the same mistake 

 should have been made in both cases as to this massive vesuvi- 

 anite, but its whole aspect is so jade-like that it is not surprising. 

 The rich translucent green color, fine-grained subsplintery frac- 

 ture, and brilliant luster when polished all strongly suggest jade. 

 The polished surface shows minute pale streaks or flocculi, which 

 still further heighten the reseml)lance. 



The following analysis was made through Prof. F. W. Clarke, 

 chief chemist of the U. S. Geological Survey, by Mr. George 

 Steiger, in the spring of the present year. 



Analysis of Vesuvianite, from Siskiyou Co., Calif. 



SiO^ 35-85 



Al^Og 18-85 



CaO . 33-51 



Fe,03 1-67 



FeO ._. ._ 0-39 



MgO 5-43 99-85 



MnO 0-05 



* N. Y. Acad. Sciences, Oct. 19, 1903 : N. Y. Min. Club, Oct. 20, 1903. 

 \ Mineral Resources of tlie U. S. (extract), p. 30. 

 tFellenberg, Jahrb. Min., vol. i, 1H89, p. 103. 

 § Ann. Mus. Wien, vol. iv, 1889, p. 87. 



TiO, ..._ 



_. 0-10 





PA--- 



.. 0-02 





H,0-.._ 



.. 0-29 



below 100° C. 



H,0..., 



.. 4-18 



above 100° C. 



