82 NOTES ON SOME MINERALS. 



ACTINOLITE. 



At the Woolshed Gap, on road from Barraba to Bundarra, in 

 radiated masses of slender prisms, in connection with a large vein 

 of milky quartz in granite. The mineral is in places attached to 

 the quartz, or penetrating it, but masses free from quartz occur, 

 up to five or six pounds weight. Colour, brown or black, some 

 with greenish tinge. Opaque in mass, but separate prisms 

 translucent. 



At Giant's Den Tin Mines, near Bendemeer (N.E.), on the 

 highest peak of the Giant's Den Nob, in acicular crystallizations 

 on cassiterite, and in radiated masses on opaque quartz ; greenish- 

 brown to brown, and nearly black. 



Actinolite occurs in many places in the New England tin 

 mining districts, in small veins, or in radiated isolated masses, 

 more rarely in acicular crystals penetrating crystals of colourless 

 or smoky quartz. Actinolite rock in water-worn pebbles and 

 small boulders, is common in the alluvial tin workings two miles 

 S.E. from Tingha (N.E.). These pebbles and boulders are very 

 compact and tough, and often show a radiated internal structure 

 when broken. 



AXINITE. 



At Bowling Alley Point, near Nundle, in granular masses and 

 small crystals, with green epidote, in quartz vein, traversing hard 

 splintery slates, on ridge about 150 or 200 yards south from the 

 iron foot-bridge. Colour brownish, with pink tinge when newly 

 broken ; occurs only in small quantity. 



Beryl. 

 At Glen Creek, near Emmaville (N.E.), two miles north from 

 Dolcoath tin lode, in situ in small mineral vein, traversing 

 indurated clay slates, associated in druses with crystals of topaz, 

 quartz, and cassiterite ; found also in isolated prisms embedded in 

 the rock. Crystals transparent, rarely opaque, bright green to 

 colourless. The largest crystals not more than f- inch in length 

 by T V inch thick ; generally striated longitudinally, but some 

 with flat smooth sides, some crystals with terminations like 

 figure 8, but mostly rough pointed like figure 9. The green 

 colour is often distributed unequally in the prisms. The associated 

 crystals of topaz are usually larger than those of the beryl, but 

 are generally full of greyish-white cloudy matter or dark coloured 

 inclusions, and abound in gas pores. Some of the smaller crystals- 

 are very brilliant, transparent and sound. 



Zircon. 

 In the Inverell District zircons are found in many places over 

 a large area, chiefly of basaltic country, forming the watershed of 

 the Macintyre River on the northern side, and extending from N* 



