706 HENRY S. WASHINGTON 
The specimen from Cantina Ziton has a perhyaline groundmass 
—an almost colorless glass, slightly mottled with “dust” but free 
from microlites, spherulitic through the presence of yellow-brown 
cumulites, which are almost opaque and without action on polarized 
light. These are sometimes isolated and globular, and elsewhere 
in streaks with marked flow texture. They resemble the spherulites 
of some Hungarian liparites. 
The obsidian is an almost absolutely pure, perfectly clear, 
light-brownish glass, less than 1 per cent of crystals being present, 
very small euhedra of alkali-feldspar and rare augite microlites, 
but no cossyrite. No perlitic cracks are seen in these or any of 
the glassy groundmasses. 
Chemical composition Four analyses by myself and four by 
Foerstner are given: 
ANALYSES OF HYALOPANTELLERITE 
(KHAGIARAL VARINGOSE-GRORUDOSE) 
A B c D E F G H Aa Ba Ca Da 
SHO}. 6 6 40 69.91| 66.07] 69.33/67.85| 69.61] 68.75] 68.33] 67.89/1.165|1.1or/I.156)1.131 
Al,O; .| 8.58] 11.74] 8.62)12.87| 8.02) 5.91] 10.94] 11.53] .084| .115] .084] .126 
FeO; TASrlr 205/02 .05)) BSA 7.17) 5.60) S74 An S| OL Ons! eyOn7] Moree 
EO) 5 6'b 5.86] 5.88) 5.52] 4.54] 2.83] 5.33] 5-42] 4.52] .082] .082] .076] .063 
MgO. 0.28} 0.13} 0.52] 0.30} 0.65] 0.08) 0.16} 0.62] .007| .003) .013] .008 
CaQeee. 0.33) 0.46] 0.52] 0.17/ 0.88} 2.11|/ 1.36] 1.51} .006] .008] .009] .003 
Na.O 6.41] 6.80} 4.78] 6.03] 7.47) 7.52] 7.00| 5-70) .103) .I1I] .077] .007 
KO ans: 4.71| 4.80] 4.71] 4.83] 2.88) 4.28) 4.08] 3.71] .o50| .o51| .o50) .o51 
H.O0+ OQs22]| Onl 2sQsil ©ots Oo7All yobs! | mgCb|) ©.29Bil socal) 2ccc fae 
H.O— OLua) “O.©8)) ©L27/| ©se2), mech) ingel| mal, scone So ayes ff ace spl | ee |e 
TOO eles ¢ 0.75) 0.92) ©.85| 0.83] n.d.| n.d.J n.d.| n.d.! .co9| .o12! .orr] .oro 
TAO be 8.9 6 oo ally Og SUE tite ee pole noe 3 Renee sao Ae 
EEO eb dle 6 0.16] 0.18 0.08} n.d.| n.d| n.d.| n.d.| .oor] .oor OO1 
SO; eee SORA Cue} UH Geena [an alee Eel | easier ee Eon Cee ic etsS Illa 0.0: 
MnO 0.24) 0.16] ©.27| n.d.| nd.J nd.J n.d} n.d.} .003} .002] .004 
IBA), bc 4 ..|. none ee Cu0= 
0.25 ee 
99.39 100.09|1T00. 39/99. 49/100. 25 MESO HOH» 100.41 
Gelkhamar. H.S. Washington, analyst. 
Khagiar. H.S. Washington, analyst. 
Obsidian. 
Khagiar. 
Khania. 
MamAhooane 
Cantina Ziton. 
. Monte Sant’ Elmo. 
Costa Zeneti 
H. Foerstner, analyst. 
Cuddia Randazzo. 
H. Foerstner, analyst. 
H. Foerstner, analyst. 
H. S. Washington, analyst. 
H. S. Washington, analyst. 
Zeits. Kryst., VIII (1884), 173. 
Zeits. Kryst., VIII (1884), 170. 
Zeits. Kryst., VIII (1884), 170. 
H. Foerstner, analyst. 
Aa. Mol numbers of A. Ba. Mol numbers of B. 
Ca. Mol. numbers of C. Da. Mol numbers of D. 
Zeits. Kryst., VIII (1884), 186. 
