500 University Geological Survey of Kansas. 
Caledonite. 
The rare basic lead-copper sulphate, caledonite, occurs in 
very small quantities as a green crystalline coating, asso- 
ciated with linarite, aurichalcite, and cerussite (with a little 
unaltered galena), at the Big Coon mine, Galena. Heated in 
the closed tube it becomes black and gives off water. It reacts 
for lead, copper, and sulphuric acid. It is soluble in nitric 
acid, leaving a white residue of lead sulphate. This mineral 
has been reported from but two or three other localities in the 
United States. 
Linarite. 
A mineral answering the tests of linarite was found in 
small quantities at ‘the Big Coon mine, Galena. It is azure 
blue in color, with vitreous luster, and reacts for lead, cop- 
per, and sulphuric acid; gives off water and loses its color 
when heated in a closed tube; soluble in nitric acid, leaving 
a white residue of lead sulphate. It is associated with 
cerussite, caledonite, malachite, and aurichalcite. Linarite 
seems to have been reported from but two cther localities in 
this country—at the Cerro Gordo mines, Inyo county, Cali- 
fornia, and Organ mountains, near Las Cruces, N. M. 
Gypsum. 
Observed forms: b(010) “Po; V(110) oP; \(111)— P. 
Crystals with the above forms averaging about 3 cm. in 
length occur in bituminous shale (probably Coal Measures) 
on the Mastin ground, southwest of Galena. 
Minute crystals, often in stellate groups, are found on the 
surface and in cavities of chert and other rocks on dump 
piles. They are secondary in origin, and in at least some 
cases have been formed since the rocks were taken out of the 
ground. 
At the Gracie Clark mine cleavage pieces of calcite lying 
exposed on the dump piles for some time have been partially 
changed to hydrous calcium sulphate, the sulphuric acid of 
which was doubtless formed by the oxidation of pyrite, which 
occurs plentifully on the same dump piles. 
