MINERALS. 275 
STAUROLITE. 
_ Altered staurolite from Liberty Grove, Cecil County, Maryland. About two-thirds 
muscovite. Analysis by George Steiger. 
DOSLT Nag O' cratscsicisis craarecomaidhae ean ticeaat pestis ye 0. 48 
si55: || F1gO at 100° 2) 56.cemcmosad macnn cweseanceyese - 42 
27.97 | HsO above 100° 202. cece ssveseuscceaeeexees 3. 94 
Gelds |. PsOps cxcssccocneeeucancine sleeneseaeeeemns 06 
18 mo 
7.77 
GADOLINITE. 
Analyses by L. G. Eakins. 
A. From Llano County, Texas. Sp. gr., 4.239 at 17.4°. 
B, C. From Devils Head Mountain, Douglas County, Colorado. Specific gravities: 
B, 4.56 at 179; C, 4.59 at 25.5°. Described in Proc. Colorado Sci. Soc., vol. 2, pt. 1, 
p. 32. 
A. B. Cc 
SiO, 23.79 | 22.13 21. 86 
ThOs. 58 - 89 81 
BN aise dis baastcasad danip Rie ame IEA RSE RE SRNR ree nie arnmEAs Mune ames 2.34 54 
Fe203.. - 96 1.13 3.59 
Ce,0; 2.62 | 11.10 6. 87 
(La Di)20; 22} 21.23 19.10 
203 241.55 | 69.50 | 612.63 
Er.03 012.74 | 515.80 
OO iors siercrnaaigsisisciesctes 12.42 | 10.43 11.36 
MnO... trace |........ 11 
G10. 11. 33 7.19 5. 46 
CaO. 74 34 47 
MgO... trace .14 16 
K0.. trace -18 20 
NaO. trace - 28 32 
H0.. 1.03 - 86 74 
P205 Bn eee eee 
100.29 | 100.48 | 100. 02 
@ Molecular weight, 260. > Molecular weight Y, Er group: in B, 296; in C, 294. 
YTTRIALITE. 
From the Baringer mine, Llano County, Texas. Analyzed by W. F. Hillebrand, 
and discussed in Am. Jour. Sci., 4th ser., vol. 13, p. 145. 
BE ciara aitig maaan taal gic eaten aa enwatan 9 ec wince cries ecu ananssneumncnodund 0.80 
i . 67 
.16 
32 
. 04 
LaO3 group, mol. wt., 335.6........-.------ StABY | (COs. ccc ioenecoauce sacs: eubaoaeececcecces al 
Y203 group, mol. wt., 265.8... BAG Pe iasusnccmanicamsaneasnesaoundoianeey 28e3 12 
ROO secre Seeds sari eeseataeeecmanenaatas .76 | A, He, F, and alkalies by difference........ 31 
UOT ions tater ivi chatroom cr Ueeeshaantoi re 1.90 
MNO po weewastiviaceisgacnse hor eaemeesenedeeebas 88 p0H00 
