82 THE MINERALS OF TASMANIA. 



vughs. At Bell Mount, remarkably-fine double-terminated 

 crystals of gmelinite have been obtained. The ordinary 

 forms, such as chabazite, phacolite, and phillipsite, are to be 

 found in more or less quantity, and in all states of preserva- 

 tion, where the Tertiary effusive rocks prevail. In the 

 basal tvitrophyre, which is, apparently, common about Shef- 

 field, numerous beautiful zeolites abound, including radiat- 

 ing masses of stilbite several inches in length. The mar- 

 garophyllite section embraces a large number of those in- 

 definite so-called mineral species which, as a rule, do not 

 afford the mineralogist any serious interest. It includes 

 the normal chlorite, and a variety poor in iron, which is 

 termed leuchtenbergite, which has been identified in the 

 variolite rock at the Magnet Mine, beyond Waratah. In 

 every way, typical gilbertite is abundant at the Anchor Tin 

 Mine. Sericite occurs as sericite-schist, and talc of a 

 beautiful pale-gre'en colouration and glimmering lustre has 

 been discovered on the north flank of the Meredith Range. 

 A thin seam of green pyrophyllite, highly auriferous, occurs 

 at the Mount Lyell Mine, as a thin flucan between the ore- 

 body and the adjacent country-rock. Serpentine in con- 

 siderable variability is prominent at the Forth, near Bea- 

 consfield, at the Heazlewood, on the Huskisson River, and at 

 Dundas, that from the last-mentioned locality often showing 

 splashes and blebs of kammererite. At the Heazlewood 

 this substance appears to merge into the ultra-basic "nrt 

 gabbroid rocks of the locality. In the class of anhydrous 

 phosphates, apatite is only known in very limited quantity 

 at the Hampshire Hills; the same may be said of mimetite 

 and plumbogummite. Pyromorphite, in compact entangle- 

 ments of the hexagonal prisms of a peculiar dark-green 

 colour, has been found plentiful at one of the Zeehan silver- 

 lead mines, and carminite has recently been identified from 

 the Magnet Mine. At the Britannia Mine, Zeehan, a small 

 quantity, of campylite, showing the characteristic barrel- 

 shaped crystals, is known to occur. Quite recently diligent 

 search has been made for the phosphate of the cerium 

 metals, monazite, on account of the thorium contents, which 

 element, in the form of nitrate, is used in the manufacture 

 of the incandescent gas mantles. It has been found to 

 occur in the form of heavy alluvial sand, practically, wher- 

 ever the granite , is met with. In this form it has been 

 obtained at the Stanley River, a tributary of the Pieman, 

 at Mount Stronach, at the Pioneer Mine, at the South Esk 

 Tin Mine, and at Derby ; but, so far, not in sufficient 

 quantity to render it of economic value. Of the hydrous 

 phosphates, wavellite is, perhaps, the most abundant oud 



