BY W. F. PETTERD, C.M.Z.S. 157 



formed crystals up to 1 inch in length and in crystalline 

 bunches. The measured crystal is about 1 cm. in the 

 direction of the vertical axis, and is grayish and semi- 

 translucent. The faces are fairly brilliant and gave good 

 signals; only the pyramid e (101) is present: — 



Measured. Calculated (Dana). 



^A^' = 101 aOU = 72°45' 72° 40^' 



e /\e yii = 101 a Oil = 107° 15' 107° 19^' 



At Gould's Country scheelite occurs of a translucent 

 resin-yellow colour with a crystalline surface. (W. H. 

 Twelvetrees.) 



285. Schiller Spar (Hydrated Silicate of Magnesium). 



An altered form of diallage, which is one of the mono- 

 clinic pyroxenes. It occurs at the Parson's Hood Moun- 

 tain ; in connection with serpentine at the Heazlewood ; 

 of foliated structure and pale-green colour in serpentine 

 at Dundas. 



286. ScHROTTERiTE (Hydrous Aluminium Silicate). 



A soft, brittle, white to honey-yellow-coloured gum-like 

 substance, occurring as an incrustation in patches in a 

 fissure in Silurian slate. It decomposes to a white powder. 

 Occasionally it is stalactitic or mammillated, and easily 

 falls to pieces. Obtained near the Pieman River. 



287 ScoLECiTE (Hydrated Silicate of Alumina and Cal- 

 cium). 



Occurs in oblique crystals or as acicular tufts, and some- 

 times of fibrous radiating structure. 



A radiating zeolite, occurring in the dolerite rock of 

 Launceston. 



288. Stviithsgnite (Carbonate of Zinc). 



Only observed in small patches on limonite. Magnet 

 Mine. 



289. ScHLEROSPATHiTE (Sulphate of Iron and Chromium). 



This substance occurs with the presumed knoxvillite at 

 the Salisbury Mine, Blue Tier, near Beaconsfield. Like its 

 congener it has a highly fibrous habit. It is found in 

 large, compact, felted masses, which are extremely tough 



