aenth.] 230 [Aug. 21, 



I had intended to make a full investigation of the same, but unfortu- 

 nately it has been mislaid or lost. 



However, I will give the most important part of the information about 

 its occurrence, which I have received in Mr. Knabe's letter, dated High- 

 land, March 26th, 1871. 



^^ I send you enclosed a mineral from the Iron Rod Mine, Silver Star 

 District, Montana, wMch I hope will he interesting to you. The same sub- 

 stance apparently is found in the Silver Star District in all the veins which 

 occur in the crystalline states. I have not examined that from the Iron 

 Bod Mine, because I did not wctnt to use uf a -portion of the already small 

 quantity — but in a mineral of exactly the same appearance from the '''Green 

 CampbelV Mine, in the same District, I have found oxides of copper and 

 lead and telhiric acid. I shall try to obtain it from different mines in 

 order to ascertain ichether it is constant in its composition or is a inixture. 

 In the Oreen Campbell Mine it is found as a thin coating upon the selvage 

 of the footwall, whilst in the Iron Bod Mine it occurs in the fissures of the 

 rock.'''' 



In the same letter Mr. Knabe mentions the interesting fact of having 

 examined a graphite from the Harvey Lode, occurring in the dolomite, 

 which contains 2.1 per cent, of silver. 



This is the last information which I have received from Mr. K. ; in it 

 he states that in the latter part of May, 1871, he would make explora- 

 tions in the wilderness, 40 miles W. of Highland. 



8. BlSMUTHINITE. 



Dr. Burkart states in an appendix to his observations (1. c.) on the 

 American Tellurium Minerals, (Leonhard & Geinitz Neues Jahrbuch, 

 etc., 1874, 9,) that in the Las Animas Mine on the Sugar Loaf Mountain, 

 Colorado, bismuth ores are found — either native, or in combination with 

 sulphur and tellurium. 



The few small pieces of bismuth ores which I have seen from this lo- 

 cality were bismuthinite, in stout columnar aggregations, in great part 

 converted into bismuthite, but with still a large percentage of undecom- 

 posed tersulphide. 



It contained a small percentage of silver, but not a trace of tellurium. 



9, SCHIRMERITE — A NEW MINERAL. 



Massive, finely granular, disseminated through quartz ; no cleavage 

 could be observed ; fracture uneven ; soft, brittle. Sp. G. = 6.737 ; lead- 

 gray inclining to ii'on-black, lustre metallic. B. B. fuses very easily 

 and gives the reactions of bismuth, lead, silver and sulphur. 



After deducting 1.00 per cent, quartz in analysis I., and 1.07 per cent, 

 in II., the results are as follows : 



