200 Second Supplement to Dana’s Mineralogy. 
These analyses give Scheerer for the mean oxygen ratio, for 
H, k, 8 { Si, 2-02 : 6-66 : 15°28 : 19°73. 
Scheerer, in accordance with his hypothesis, supposes = to replace = and oi 
replace 1k, and thus arrives at the ratio for [Si] : (R), of 4:1. The xygen ratio 
e, 
The Zoisite ag ‘the Saualpe i in Carinthia, "whe ere it occurs in eneiss, contains zir- 
conia according to an analysis by Kuleszna, in which he obtained— 
Si4400, 4130-97, Oa1776, e492, Zr 2-00 = 99°67. 
The author observes that Klaproth’s analyses are erroneous. 
Evoase [p. 267]—Mean of four analyses by M. A. Damour (Comptes Rend, xl, 
944): 
Si x1 6Be «6 Gan—CséFPe:~S Gn H Fl 
4163 3407 1697 O14 108 084 604 0:38=100°60 
Oxygen, 21°61 15:92 10°73 5:37 
(The oxygen ratio between the bases and the silica is between 5:4 and 4:3. 
With the latter, the formula is (28e+2A1) Si+3H, 0 ict 2BeSi* +: i Bit yh. 
iffering from the analyses of Mallet and Berzelius ining t 
the ratio of 2 to 3 instead of 1:1, and also in the wauie as Scott as fein ae, 
and resembling ori 5 nit S y: 
tes brown to hyacinth-red or edie galtow Streak grayish-green to ownish 
2-78. i tic. flame of a spirit 
inchbeck-brown, to white, semi-metallic and o sea _ . . shi 
“Ld 
foliates and yields water. BB. blackens; thin leaves fuse on the edges t 
netic globule. With borax fuses easily ; with salt of phosphorus diffcalily, vie elding 
a silica asl with soda swells up and shows a manganese reaction. Analysis 
ems v. Hau 
i Al Fe Mn Mg Ht 
38:13 21°60 19°92 2:61 13°76 398100. 
The ellen # Si, 3 stacey i. 
eye the sclbhida ms flexibility of the mineral. 
: aks So or + he ee Si—s. 
ENSTATITE, Kenngott (Min. Not. No. 17).—Augitic in crystallization, although 
having some resemblance tn Scapolite. J: J=87°. Cleavage parallel to ‘4 distinct, 
and having a pearly lustre. Color grayish or ellowish- white be S. G.=3 — 
-318. BB. infusible, wert this the nam: 
to von Hauer contains, Si 56-91 nei tsa, He 276, Mg 3o4s, W199 (al 
lst at 100° C.); and cs di is a batons of Magnesia 3812), as Wollastoni 
isa peo of lime (Ca3 $i2). sci 
te group hence includes 
abet ite Cas Si2, Diopside (Ca, Sg)3 Si2, 
Enstatite Mg Siz, Hedenbergite (Ca, Fe) Si2, 
vaneri Fes §i2, Bustamite (Ga, Mn)3 Si2, 
Mns Si2, Hypersthene (Fe, Mn)3 Siz, 
RES: included under pyroxene. 
ge some feldspathic minerals from the Hypenten’ 
by TS. unt, Phil. Mag., [4], ix, 354. The paper contains the fol 
z analyses, besides Bros contributed to the Mineral 
ater, the co — me to the general formula of Biotite . 
Se ewan ec ETO ar semen PY CRC TOnt Senna 
