————2.,° Se 
Clarke and Diller—Topaz from Stoneham, Me. 379 
aa by Hempel, and modified in this laboratory by Chatard.+ 
he results may be tabulated as follows: 
A, unaltered topaz; B, greenish layer; ©, purple zone; 
D, massive damourite ; E, foliated damourite. 
B. D. E. 
aaa 3°51 3°42 2-82 
Hardness ______ 7. 
| 
“a: a Ae | Seepe rent 6-16 22 44°52 ----.| 45°19| 46°34 
| ee $798. (220. SS eee Pet eee 33°32] 33-96 
hon 1699 PP21) Ss 040 80°38 
re, PL 0.20 0-20} 090 0 3°74 399 48 
a eee a Se 0-15 012| 1:62  .... see Ten 1:06} 10°73 
aN CAD Ee ig 1:33 118} 1:28 ----.| 2°82 ____. 167! 
rhe gg Sh cari Ob a ace pais ae oe 4°25) 3°96 
yy RoE Ves RRC Iee: lace ter, Same Uag smrntts eo Game 0°58 0-51 
— Eee ee Dee ie hea ee 1°32 1°42) 0°30  0°48| trace. 0°22 
Bie, atte ee O17 «(O14 614 Ls. 0°36 =: 0°10 
- 107°97 /106°40 100-62 100°81 101-09 
educt oxygen._| 7°16 5°42 "16 
100-81 | 100-98 100-46 
If we now consider these analyses in their order, we find first 
that the topaz itself is ordinary topaz, having none of the 
* This Journal, July, 1884. Also Bulletin No. 9, U. 8. G."S. 
+ Bulletin No. 9, U. S. G. S., 1884. 
