770 THE TIN-DEPOSITS OF NEW ENGLAND, N.S.AV., I., 



The quartz is well crystallised, and double-ended crystals are 

 common. It is clear and of the glassy type. Cassiterite is some- 

 times included in crystals of quartz. 



One occurrence deserves special mention. This is known as 

 Hutchinson's Felspar-Lode, and is situated about 3 miles, south 

 by east, from Tingha. Here large masses of crystallised felspar 

 were found associated with very coarsely crystallised quartz. 

 Felspar-crystals, several inches in length and with very perfect 

 crystal-form, are still to be obtained. Masses of smaller crystals 

 of quartz and felspar, intimately intergrown, also occur. (Plate 

 Ixii., fig.3). 



Class vii. — Chlorite-Deposits. 



These deposits are of the nature of impregnations, and do not 

 appear to be associated with fissures. They are rather rare in 

 the area under consideration, though similar deposits seem to be 

 very abundant in Queensland, and Cornwall. At Stannifer an 

 interesting deposit was worked by Mr. Stormer. This consists 

 of an ill-defined, mineralised area surrounded by hard " Acid 

 Granite." It does not present any of the features of an ordinary 

 lode, and is limited in extent to about 50 square yards. The 

 gangue-minerals are chlorite, hydrous iron-oxides, quartz and 

 felspar. Handspecimens may be obtained, showing the passage 

 from chlorite vein-stufF into the granite. In these the vein-stufF 

 is seen to be chiefly chlorite and felspar, while the granite is 

 almost wholly quartz and felspar. The deposit, then, appears to 

 be an impregnation in which quartz has been replaced by chlorite. 



About half a mile to the west of this deposit, lies the so-called 

 Kelly's Reef. This was found in sinking for alluvial, at a depth 

 of about 6 feet. The deposit was followed downward for about 

 25 feet, and appears to have been about 6 or 8 feet in diameter. 

 The dip is about 40° in a direction S.35*^E. The shape could not 

 be accurately determined, but it appears to have been roughly 

 cylindrical. Part of the vein-stuff still remains in the floor of 

 the excavation. The main lode-stuff consisted of chlorite and 

 felspar, and was separated from the country-rock by a zone of 

 hydrous iron-oxide. The country-rock is the "Acid Granite," and 



