18 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
MASSACHUSETTS. 
1, MAGNESIAN ROCKS. 
A. Cortlandtite, Belchertown. Belcherose. Described by B. K. Emerson in Mon. 
XXIX. Contains hornblende, pyroxene, biotite, olivine, and magnetite. Analysis 
by L. G. Eakins, record No. 13826. P. R. C. 1616. 
B. Wehrlite, New Braintree. Cookose. Description furnished by Emerson. Con- 
tains diallage, enstatite, augite, anorthite, biotite, apatite, chromite, magnetite, and 
pyrrhotite. Analysis by L. G. Eakins, record No. 1327. P. R. C. 1617. 
C. Black, serpentinized boltonite, Stow. Collected by Emerson. Analysis by 
W. F. Hillebrand, record No. 1555. P. R. C. 1618. 
A. B. Cc 
SiO ge sng Hiei deme de cities asada isitacnatesieteripnutouies si sketpmeemuttiasistine sib terensletereesteatd te 48.63 | 50. 64 36. 92 
AD 8O8 riers setae stoi cpe as gy aagrs ase oanere iets erassinne tas dioGaels sterajatemianeienaieielsteraetargtete 5. 32 7.93 1 
Fe03 2.91 1.41 1.19 
FeO 3.90 | 14,82 87 
MgO 21.79 | 18.58 43.99 
CaO. 13.04 3. 41 5 
Re a) Spa 
Oe hs ese enor Fihad reseed nee Suit ee Seyed WaGek Glee s HECRSESRER Mista ee eee sae : Z -05 
EO! Ab 100%... teva alas Seat ond acetmawrietemiasice Delcidaaunaisaeed nema meee sae 2.81 \ 87 72 
TsO: above) 002 as sds saas babe ohes re edcanee ote acca ceacuaeas 1h Meese as i - 14.70 
Tig. 22.2.22<: -47 82 none 
COs... PACE: | sick cisre-g:s -90 
P20, 21 27 trace 
CreO3 . 36 05 none 
MnO 12 16 trace 
BaOs ee cnecnis vesecpecemchieea eeecge ratameniasis cis seal ermamsns werEeEeae Tee trace j|-.....-. none 
100.13 | 100.13 | 100.03 
The following serpentinous rocks are described by Emerson in Mon. XXIX: 
D. Serpentine, derived from salite, Osburn’s soapstone quarry, Blandford. P. R. 
C.-1619. 
E. Dark-green, oily serpentine, center of large Middlefield bed. P. RB. C. 1620. 
F. Enstatite, slightly altered, from Granville. For comparison with G. P. R. C. 
1621. 
G. Serpentine, derived from enstatite, Granville. P. R. C. 1622. 
Analyses D, E, and F by W. F. Hillebrand, record No, 1555. Analysis G by George 
Steiger, No. 1536, 
