BY W. F. PETTERD, C.M.Z.S. 81 



white through brown, red, green, yellow to black. They 

 may be transparent to opaque, with great variation in this 

 respect. When the colours are rich and free from flaws 

 they are looked upon as gems of minor value. Garnets are 

 abundant in many mica, hornblende, and chloritic schists, 

 occurring often in granite, syenite, crystalline limestone, 

 and (more rarely) in serpentine. They are a product of 

 contact metamorphism, more particularly in the zone con- 

 necting limestone and the crystalline rocks. Small pink 

 garnets occur numerously scattered throughout a dark- 

 green chlorite, which is rich in cassiterite, with some 

 blende and copper pyrites. This chlorite occurs as a band 

 connected with the granite. 



Locality: Stony Ford, about a mile from George's Bay, 

 East Coast. 



" Yellow crystals (grossularite ?) occur at Mayne's Tin 

 Mine, south of Mt. Heemskirk. The forms developed are 

 the trapezohedron, or a combination of this form with 

 the rhombic dodecahedron. Similar crystals are found 

 in fhe ore-body of the old Silver Stream Mine at the Com- 

 stock, usually in combination with lime-bearing silicates. 

 The garnet also forms a gangue mineral in the sphalerite 

 ore of this mine. Clear blood-red crystals also are found 

 at Mayne's Tin Mine." (L. K. Ward.) 



Undetermined species occur at the Hampshire Hills, 

 where they are found in profusion. They vary from brown 

 to black in colour, and often reach an inch in diameter. 

 On the south side of Cape Barren Island they exist in situ 

 in a quartz porphyry, also free in the detritus derived 

 therefrom, usually mixed with cassiterite. At several 

 localities in the north-eastern tinfields they are plentiful 

 in the drift, but generally of small size; common in the 

 vicinity of Mt. Heemskirk, usually opaque, but sometimes 

 of good colour and transparent. Near Mt. Claude a solid 

 compact to sub-crystalline garnet rock of yellowish-brown 

 colour occurs, apparently belonging to the sub-species 

 grossularite. At Mt. Ramsay another rockmass has bee:i 

 found of a dark-brown colour. At this locality well- 

 formed crystals have been obtained, embedded in a soft 

 magma that allows them to be easily extracted. Near 

 Highwood, on the Emu River, clearly-cut dodecahedra, 

 of a translucent white to light-yellow colour, occur in lode- 

 matter (W. R. Bell) ; and on the Whyte River, near the 

 Meredith Range, in minute crystals and compact masses 

 of reddish-yellow colour — apparently belonging to the 



