_ Fifth Supplement to Dana’s Mineralogy. 405 
_ The crystals of pennine are acute pce sg truncated at ay mn Seated and 
_ often tabular. — pos mh of A ar 4, O: A==103° 
la and Zermatt, have R: 
_ 43’ and 76° 15’, as taken with the re esting unin eter. ey So sometimes in 
a ley parallel to the base, Leaking ebiprts dal on “oh mises , Ne et 
i nnine from Zermatt, § Doanclades ux R:  Ra=68 , =100° 80’; but the | 
i difference ma ay be sara, as _ . uae of the latter are CG quite asa The 
' ngn lish re een and tra ans gi crystals of Zermat and the Tyrol are negative, 
f é deep green of Zerniatt es especially A e positive: but =~ 1b row of 
ts itr appear to be sober and hardly let ae polaris zed rays pass. euch- 
tenbergite is positive and the same in at with — glee 
The ge of Achmatowsk, he observes, has the ua ‘of 50° between the 
‘ optical ax The axes in Pa species are positive. "oe re efer s to “dinoehlens the 
ins hexagonal. chlorite of Pfits mi oe “Aitertha thal in the Tyrol. which occurs in 
G Serremida Se ererns pinnae nd ¢ gle nO and planes on AN 
asil papi commen v ane zone, 108° 14’, 120° 2 ae 42’, 128° 
185° 46’. nate gh sles has the optical paras Bs of clinochl specime <A, 
ES ee from Marienberg. For optical characters see sgevteen 399 of this 
emen 
loi 3a 
talcose J » persed lore olan ‘det mde ontically “that go tale-like pe Bate 
forms its centre bind a | pits like bare its border. A similar mineral is found 
at Taberg, and at Brosso in Piedmont. The last, according to Damour, cuntains 
Si (by ditt Xl Mg Fe i 
20°37 29°49 657 10:10 
The large proportion of alumina suggests to him that this may be a disti a species. 
The com ipidolite was given by von Kobell to Aare chlorite in grouped 
g with crystals of adularia and quartz at St. Gothard, at initia in the 
Zillerthal in ane Tyrol. The doulas refracting power is feeble; it 
Bons, an “ger and the wale an angle with one another of about twenty 
degrees es on ae, yo toa pore op very magnetic enamel. e 
chlorite analyzed at arignac has eee ame ti similar appear- 
ance; it occurs in nests in the v valley of B eae Oana ut the Mountain of the 
Sept-Lacs, between Allevard and Allemont, i in the granites mowed Chamouni, and 
in the Alps. 
‘ lcisegux rengnizes three groups of. Chlorite, and adopts for them the names 
ennine, Finechies re and Ripidoli 
Cutoriroin [p. 298].—The following are the eae hitherto made of the bind 
is Of oe dh ere (see von Kokscharov, Min. Russ, ii, 857). 1, 2, O. L. Er dr 
ry 1 v, 127, vi, 89 [ealled ciloriespar in Min., p. 298]); 3, Gente: 
the te 1845, xxxiv, 454); 4, v. (G. Rose’s Reise n. 
ns a Ronat (J. £ pr. Ch, 1851, liii, 13); 6 vy. Kobell (ib, 1853, \viii, 40): 
al -¥e Fe Mn Mg 
shh 4620 =—. 2899° 2 ois sce 9909 Erdmann. 
4°06°%4898 ou $12) <_<. si =10000 Erdmann. 
2454 30°72 1728 1780 —— 375 638== 9997 R. Hermann. 
; 2 2301 40296 —— 2740 —~ 397 63410098 v. Kobell. 
_ «Hermann su Erd (and afterwards b 
one sts that tk seagate analyzed by mann (a y 
Gera ‘athewohl, ha a i pea ee s from the same aeeesens) had been burnt at the mine 
Ay they = eg ne stone for oensrsting the emery, and he thus accounts for the 
1 
2 
8. hic haa aan jolie 
M 2748 8557 —— 2705 0:30 429 695==101°64 v. Bonsdor 
6 
: tice cy fe 
Von obell's aaa sis cives the same composition that he obtained for the Bregrat- 
_ te chioritnid, | (The sate hetween the oxyven of the bases and silica (w water ex 
a cluded) is 1: 4, the dan seatide ratio, ange the fact that there are simple alumina Poin 
ates in which the ratios } and $ occur sufficient reason for admitting hits $e in 
formulas of the chlorite series of min a The for mula of chlorituid is ike 
—& “inant Aq, or (R*, B)Si§ + Ag.—a. v.01] 
