MINERALOGICAL NOTES: No. X. 



BV 



C. Anderson, M.A., D.Sc, Miueralogist, Australian Mm,enm. 

 (Plates i,-viii.). 



Bkrvi.. 



Torriiigtoii, N.S.Wales. 



(Pis. i., ii.) 



Beiyl is a fairly commou miueral in the granite area of New 

 England, occurring both iu sita and, more frequently, as rolled crystals 

 and fragments in alluvial deposits. Fine crystals, some of considerable 

 size, have been found in the Torrington district, and in a previous paper 

 crystals from Heft'ernan's Mine in this locality have been described and 

 figured The crystals measured up to 6 X 5 cm. and were very simple 

 consisting merely of the prism „> (lO'lO) and the base (0001) ; recently 

 choice crystals of greater ccmiplexity have been obtained from this mine 

 and others in the vicinity, and are here described. An interesting feature 

 of some of the crystals is the curious markings they exhibit, particularly 

 on the basal plane. The zonal and parallel growth shown by many of 

 them is also instructive and may afford a clue to the conditions under 

 which they were formed. 



Occurrence and Associates ■.—Accnvdmg to Mr. J. E Carne--^, Govern- 

 ment Geologist, the beryl at HeUernan's Mine is found in a soft, 

 decomposed, micaceous rock where it occupies vugs containing also 

 quartz, felspar and mica. A specimen in the Australian Museum 

 collection, coming however from another mine in the neighbourhood, 

 consists of a mass of fractured and opaque beryl embedded m black mica. 

 Many of the larger crystals from Heffernan's contain dark inclusions, tlie 

 nature of which could not be determined, and in one a fragment ot 

 smoky quartz is embedded, indicating that quartz probably preceded 

 bei-yl ; some of the beryls are invested, particularly on the base, by a 

 closely adhering skin of silvery mica. 



1 Andetbon— Rec. Austr. Mus., vii., 1908, pp. (V2-fi3. 



2 Came— Dept. Miues N.S.Wales: Miu. Kesourceb, No. 15, 191-', pp. o8. 93. 



