180 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
E. Pumice from La Soufriére. Bandose. Collected by R. T. Hill. Hypersthene 
andesite containing plagioclase, hypersthene, augite, olivine, and magnetite. (Diller.) 
F. Dust from La Soufriére. Bandose-placerose. Collected on steamer Coya, at sea, 
about 275 miles southeast of St. Vincent, May 7, 1902. Contains feldspars, pyroxenes, 
magnetite, and possibly other minerals. Contained 0.57 per cent of soluble salts. 
Analyses A to D by W. F. Hillebrand, record No. 1991. Eand F by George Steiger, 
record Nos. 1984, 1989. 
A B Cc. D. E Fa 
SiQgs.cgecausciees semack te eeGesen tee caenaaia ta ceaeess 61. 07 60.01 | 63.23 | 55.08 | 55.64 57. 62 
BGO a crcserreasetaietencighrn eres srais toi ndiais Gmaasloursins ae Sea RS 17.55 17.54} 16.73 | 18.00] 18.21 19. 76 
Weg. occ. eee reteset sekeen aaminnessemeceataienres 2.13 2. 88 2.58 2. 46 3. 63 3. 43 
THEO sc tossseinicin wars deo Adee eeeeeeesiem ster aiates siaieticies. 4.13 4.30 3.12 4.57 4, 83 3. 90 
MEO) ccecadissindicdemcnc inc aiee Vereen sesso aee 2. 26 2.76 1.84 3.34 3. 48 1.82 
CAO sic snvee nce biumdaecancnes osese seeeiTee pematenuee 6. 28 6. 80 6. 01 7.79 8.14 6.45 
Na Ol: sacnace haea sek eirsianie Hace Ooeinsionee RARE eEeEaS 3.50 3. 41 3.71 3. 48 3.55 3.87 
Ris Ob acre a Seer eee Nee aeisteMaede Smee scene = 98 89 1.11 65 58 71 
3 Oat 108 ios cea tcacansee nieeeetielciisneecnels enicisinine 23 -10 +17 66 20 41 
THe Oi ADO VO LOS 2 cwisciiiss sSxen ee tadencwe eee terclcemetecs 1.37 30 - 48 1.39 54 59 
WO tccvem-deriemicit ccmuisidce see ceae eeeee ear esse ecient ke 247 ~45 - 40 98 87 
Zar O srsterm pee evenanveeiersensisinncisie tcnaicl aera tiaclowingiamais eS EP SR Mama trace? | trace? | trace? (G2) ial Reeeeeiee: | ee ante 
PaO pasa cxrecertaieceede as rechsirceniinnor neta eaniiaes 15 15 15 17 Tt 17 
GO goes utter contrarer ened ven eebatneteie alsite cise sakuiaece =e sme aeisl | seiieceln| se cemrier 24} none 29 
Be isc daciocgtncs caesar ae ere netemencerieeaciete mesure 016 | trace | trace j-.....-- +04 ey 
PEG Si scaessisnaernceceustanene ois fe rashes ROAD cea ee ek renee veimge ts ais  Motoreiataig-sial| wSisiciaiaiei | ajalarmiereisie OI. ciciatateracere aversistersyare 
TOS odacseicisveunssayersici a days orienta RS Tee Ree eeee ess 21 +23 18 21 19 08 
Ba Qian cccedksdicna idan nnaassascsuienim sass teeasemet 02 - 03 .03 | trace OS esses cccsers 
WisOse.iemo hud sueae Shrtterlaswas eee KetmcnmemseEeee trace trace | trace | trace |.......-]......-- 
100.366 | 99.85 | 99.74 | 99.75 | 100.15 | 100.08 
a Soluble in water; CaO, 0.20; NaeO, 0.08; SOs, 0.29, and a trace of Cl. 
COz, Cl, NiO, SrO absent, except a trace of Clin F. 
BRAZIL. 
A kyanitic schist from Serra do Gigante, near Diamantina, was analyzed at the 
request of Prof. 0. A. Derby, who describes the rock in Am. Jour. Sci., 4th ser., vol. 7, 
p. 343. Analysis by Hillebrand, record No. 1783. Contains kyanite, chlorite, sericite, 
quartz, and rutile. 
A. Bulk analysis of the schist. 
B. Portion soluble in hydrochloric acid. 
C. Portion soluble in strong sulphuric acid. 
D. Residue insoluble in sulphuric acid. 
The bracketed figures are deduced from other columns than the one in which they 
appear. 
42.64 | 56. 66 
