BY FRANK E. CONNAH. 



33 



copper minerals also occur above water level they either 

 are secondary depositions in the accompanying mineral, 

 or where the garnet itself has suffered decomposition, 

 the copper is frequently heavily impregnated as oxide 

 in the altered product. Below water level copper sulphide 

 minerals frequently accompany the garnet, magnetic 

 pyrites being often found. At the Dorothy Mine fluorspar 

 is also found accompanying the garnet. 



At Chillagoe the garnet-amphibolits combination is 

 common, and was referred to as " eklogite " bj'- Dr. R. L. 

 Jack in his report on the field in 1891, and by Professor 

 Skertchly in his report on the field in 1895, and again 

 in his Presidential address to this Society in 1899. 



At Mount Garnet the garnet mineral occurs mostly 

 in an amorphous splintery form, closely admixed with 

 calcite. It appears to form the walls of tjie enriclied 

 deposit at water level, being adjacent to a series of felsite 

 dykes. An analysis of this rock resulted as follows : — 



It was impossible to obtain the garnet in this rock 

 free from calcite, but the only minerals recognised were 

 garnet, calcite and zinc blende. The second column above 

 shovv^s the figures for the garnet constituents reduced to 

 the Same basis as the figures in the Chillagoe analysis for 



