BY W. F. PETTERD. 9 
it and Anatase at Clayton’s Rivulet, also near the Pieman River, 
and at Back Creek, near Lefroy: at the last locality it is found in 
flakey pieces, which are blood-red in colour by transmitted light. 
30. BRUCITE (Hydrated Magnesian Oxide). 
The common character of this mineral is massive and foliated> 
with a somewhat pearly lustre. It is invariably found in or near 
Serpentine. Occurs in large masses at the Heazlewood; in 
hexagonal plates which are embedded in Serpentine, Lower Castray 
River ; common west of Beaconsfield; Mt. Heemskirk, foliated 
and partly altered to Hydromagnesite. (Ballarat School of 
Mines Museum. ) 
37. BISMUTHENITE (Bismuth Glance). 
In small irregular particles in Amphibole with the native metal, 
Mt. Ramsay. A fine mass of this mineral was met with in the 
workings of the West Cumberland mine at Heemskirk. Stated to 
occur at the Blue Tier in granite and at Mt. Reid with Fluor- 
spar and metallic Bismuth in quartz. Atthe Iris River, Middlesex, 
this mineral has been discovered in a lode or vein associated with 
Cassiterite. Much of the exposed portion is altered to carbonate. 
38. BIOTITE (Magnesia Mica). 
Abundant, often of a greenish colour, Mt. Heemskirk ; the 
frondose variety has been found at the North Pieman River; in 
large plates and masses at Flinders Island and on the north- 
eastern coast; common near the Hampshire Hills, many of the 
flakes measuring half an inch across ; Blue Tier and other places. 
This form of Mica may be distinguished from Muscovite, in a 
ceneral way, by its darker colour. 
39. BERTHIERITE (Sulphide of Lead and Iron). 
Usually ofa dark steel grey colour with a metallic lustre and 
irregularly striated surface. 
On the west flank of Mt. Bischoff the mineral occurs asa 
compact lode closely intermixed with granular quartz. It contains 
a small amount of silver. 
40. BOULANGERITE (Sulphantimonite of Lead). 
Occurs near Waratah with Siderite and Mariatite in a lode, 
the gangue of which is Fluor-spar and quartz. 
The samples vary in structure to some extent; they are 
commonly fibrous and compact, but often graduate to a form 
which is almost granular, the lustre is invariably silky and 
metallic. At Dundas it occurs both fibrous and massive, and is 
often associated with Jamesonite, Pyrites, Cerussite, and Massicot. 
41. BORNITE (Sulphide of Copper and Iron). 
Also known as Purple Copper Ore. Occurs massive and of 
