268 Scientific Intelligence. 
Soapstone from Sidermannland.— Analysis by Baur, (J. f. pr. Chem. 
liii, 3138)— 
i Al Mg Fe in H 
61-73 0:84 80°65 2°93 1-40 beige 
gen 32°05 0°39 11-66 0°65 0°29 
Oxygen ratio 1: 3 and formula MgSi. Gray, massive, all without a 
trace of crystallization. Resembles meerschaum, but somewhat harder. 
Occurs in disseminate grains or massive in iron ore. Whitens when 
heated, and very slowly fuses with soda to a globule greenish while hot, 
and biown when cold. Some manganese reaction 
Note on Clinochlore, a mineral of the ontevile family ; by W. P. 
Buake.—This Journal, xiii, 116; analysis of the same, by W. J. 
Craw, ibid., 222. 
Loganite of T. S. Hunt.—The hardness of this mineral, as stated 
by Mr. Hunt i = his paper, (Phil. Mag. [4], ii, 65,) is 3, and the specific 
gravity 2°60 to 2:64. 
[A small, fosperes crystal placed in the writer’s hands by Mr. Hunt, 
nw prismatic planes of nearly or quite similar erat though 
almost dull, and not smooth, the mutual inclination of whic as found 
to be approximately 126°. Another specimen afforded We pores 
apparently alike, with the angle between them of 123° to 124°, These 
angles are not far from the angle of hornblende.—3. D. D. ) 
On the Optical characters of Micas; by H. Sen et {om de 
Ch. et de Phys. [3], xxxiv, 171. See this ig xiii, p. 409.)—M. 
scsneely there | is in fact no oblique mica. Polar rization has enabled 
him to detect such twins when not otherwise distinguishable. The follow- 
ing are the results of his measurements ; omitting only, in most instances, 
those observations which were made on micas s of unknown locality 
(1.) Micas whose optical axes are situated in the diametral plane of the 
lon * 
nger diagonal. . par, Incl. 
1. ——— — ; Bangue dolomite and diopside; brown; lini Me 70 
2. Loc. ——? Hexagon sparent; brown, a little greenish, . 2 
2: rei Hexag. ; padi nt; clear br sees hag 
4, Loc.——! Hexag.; area antag copper-colored, ee 
5. Cey Hexag. ; trans nsparent ; clear green, sae colorless, 4 8 
6. Philadelphia, Transparent ; clear 0 live-gree eH ° 
7. Siberia, in white quartz. Silvery, imperfectly trp., bi pe 
8. Zillerthal, in albite. Silvery, imperf. transparent, Lae 
9. Arendal, in a a feldspathie ro ck. — — parent; pale, ange 
10. Loc.——? Transparent; gray, r tee 
11. Loc. ——?  Hexag.; a phe. art erayah more, 67° 
? ? centr paves colorless, ; g-59° 
19, Loe 2} Transparent ; clear bro o ° 
18. Couzerans ? Silvery, greeni eenish- “erey, fei concave surface of cleavage, poi 
_ 4, St. Gothard, in quartzose gneiss ; hexag.; silvery ; clear gray, . 63° 
16. Miask. Transparent ; clear olivegreen, ore? 
Ekatherinen’ ; clear pale rose, “ 
BY Salen Imperfectly taneparent rose-colored, 
