1897.] Mineraloyy. 1049 
in the British Museum, likewise from Huanchaca, on which were the 
further new forms: 233, 354, 474, 475, 476. 
The axial ratio adopted is a: b:¢:=0.5312 : 1: 0.6395, and elabor- 
ate tables of angles show the thorough agreement of the observations 
on which is based the identity of guejarite and chalcostibite. 
Terrestrial Iron from Missouri.—Allen” describes three occur- 
rences of native iron, considered to be of undoubted terrestrial origin, 
in the Coal Measures’ of Missouri. In each case the iron was found 
during the drilling of a well; at Cameron, Clinton Co. the iron formed 
a mass several inches in thickness in the midst of a solid sandstone, 
fifty-one feet below the surface; at Weaubleau, Hickory Co. a few 
pieces of iron were found in a stratum of gray clay, interbedded with 
sandstone and thin seams of lignite at the depth of thirty-five feet; at 
Holden, Johnson Co. a mass of iron was struck but not passed through, 
in a bed of fireclay, underlying an eighteen-inch coal-seam, thirty-seven 
feet below the surface. 
The character of the iron was the same in all the occurrences. It 
was free from rust, of a lustrous silvery white color, very malleable, 
hardness 3, specific gravity varying from 7.43 to 7.88. The largest 
piece obtained weighed 45.4 grams. Some pieces exhibited a layered 
structure almost amounting to a cleavage. Polished surfaces, etched, 
showed no Widmanstitten figures. The chemical composition of the 
iron was nearly the same in the three localities: 
I II Ill 
Fe 99.16 99.39 97.10 
SiO, 0.87 0.31 1.65 
P 0.207 0.13 0.176 
C 0.065 undet’d undet’d 
99.802 99.83 98.926 
The writer appears to consider that these irons represent cases of 
local reduction, the association with coal or coal-bearing strata being 
held as significant. It seems worthy of note in this regard that the 
amount of carbon, both in the irons and in the rocks in which they 
were situated, was very small. 
1 Am, J. Sci., Vol. CLIV, 1897, p. 99. 
