TWO NEW MINERAL SUBSTANCES. 49 
Ey ii, 
Moisture at 100° C. aie D6 sid ‘13 
Combined water... ee 4-04 Ue 4°37 
Silver in vis 1 = 47°46 igee 45°87 
Antimony . 16°87 20°72 
Copper 11 48 
Lead 62 31 
Arsenic trace trace 
Gold dis trace 
Lime (CaQ) sie 3°78 va 4:25 
Magnesia (MgO) ... mee 117 ai 20 
Ferric Oxide (Fe,0,) ike 2-11 me “45 
Chlorine... a a5 ee ae 12°27 
Insoluble matter (gangue)... 1-01 se ‘90 
Oxygen (by difference)... 8:58 a 10-05 
100-00 100-00 
Mr. Mingaye added that the silver is present as chloride, and 
also in combination with antimony, as antimoniate (with possibly 
Some antimonite) of silver. The lime, copper, lead and magnesia 
are also probably present as antimoniates. 
The analyses taken in conjunction with the somewhat banded 
_ §ppearance which polished sections of the substance presented, 
- Pointed to the probability of its being a mixture and not a mineral 
of definite chemical composition, and with the object of settling 
” question it was suggested to Mr. Mingaye that he should 
s digest Some of the finely powdered mineral with strong ammonia. 
was done with the result that practically the whole of the 
chloride of silver was dissolved, only a trace remaining at the end 
of forty-eight hours. 
An analysis by Mr. Mingaye of the residue insoluble in 
“mmonia yielded as follows :— 
Silver a Hoe ac ke 
| Gold... ae vel ... trace 
D—June 5, 1995, 
Mo. Bot. Garden, 
