1 94 The Ottawa Naturalist. 



Stilpnomelane var. Chalcodite 



In 1893, amongst some specimens of hematite from the Wall- 

 bridge Mine in the township of Madoc, Hastings county, Ont., given to 

 him by Mr. John Stewart, the writer found a mineral which has proved 

 to be identical with that described by C. U. Shepard in 1851 under the 

 name of Chalcodite.* 



Shepard's mineral was from the Sterling Iron Mine in Antwerp, 

 Jefferson county, State of New York, where it occurs coating hematite 

 and calcite, and associated with the sulphide of nickel, millerite. 



It is a hydrous silicate of iron, aluminium, and magnesium, 

 belonging to the Chlorite Group of Dana's system of classification, but 

 its precise composition is still uncertain. 



The material available in the case of the Canadian specimens was 

 not sufficient to admit of a quantitative analysis, but it is hoped that 

 more will be obtained so as to enable this to be carried out. From 

 its physical characters, however, and the results of the 

 qualitative examination there can be no doubt as to the identity of the 

 species. Its name, from the Greek word x a 'l HG 9, brass or bronze, refers 

 to its characteristic color which has been well described as resembling 

 that of mosaic gold. 



The Madoc mineral, like that from the State of New York, occurs 

 in cavities in the massive hematite, coating small crystals of specular 

 iron and associated with calcite, but millerite has not yet been observed 

 at the locality. It forms rosettes of small foliated plates with a submetallic 

 lustre, someof which are rudely hexagonal in outline. Its color is a yellow- 

 ish bronze. In the closed tube it yields much water, it is almost completely 

 soluble in hydrochloric acid, and before the blowpipe readily reacts for 

 iron and fuses to a black magnetic globule. 



The occurrence of this mineral in Canada has not been hitherto 

 recorded. 



Monazite. 



Some three or four years ago whilst at the Villeneuve Mica Mine 

 in Ottawa County, Quebec, the writer was fortunate enough to find a 



*Traii>, Am. Assoc. Adv. Sci. Vol. VI, p. 232, 1S51. 



