BY W. F. PETTERD, C.M.Z.S. 155 



solvsbergite-porphyry and the elaeolite-syenite of Port Cyg- 

 net. 



281. Saponite (Hydrous Silicate of Aluminium and Mag- 



nesium), 



A soft, massive substance, which becomes extremely 

 brittle on drying. It occurs in patches of a yellow to 

 brown colour, with chrome ochre and loose quartz on the 

 hanging-wall of an irregular quartz reef, at what was 

 known as the Duchess of York Mine, Salisbury, near 

 Beaconsfield ; also occurs as a white amorphous substance 

 near Trial Harbour, West Coast. 



282. Sapphire. (See Corundum.) 



283. ScAPOLiTE. (See Marialite.) 



284. ScHEELiTE (Tungstate of Calcium). 



This mineral is tetragonal in crystallisation, but in habit 

 the crystals are the bi-pyramid, which have a striking 

 similarity to the regular octahedra. The colour is always 

 pale in tint^ with a vitreou* lustre, inclined to resinous 

 on the surfaces of fracture, which is uneven to subcon- 

 choidal and brittle, streak white. The substance was 

 named in compliment to the chemist Scheele, who dis- 

 covered the element tungsten in this mineral. Occurs at 

 Mt. Ramsay in well-formed, rather long, opaque crystals, 

 often up to 1 inch in length, and more rarely in twins or 

 crystalline bunches. The colour is pale-yellowish brown, 

 sometimes with a slight greenish tinge. It is sparingly 

 disseminated in the black amphibolite contact rock, in 

 association with native bismuth, pyrite of various kinds, 

 and a little purple fluorite. It is not connected with the 

 tin ore of this locality. It is stated to occur sparingly as 

 tabular crystals, which are nearly white, in connection with 

 a garnet rock at the Upper Emu River. In limited quan- 

 tity it occurs closely intermixed with amorphous wolfram- 

 ite at a locality a short distance north of Pieman River 

 Heads, West Coast. On the south-east coast of King 

 Island, Bass Straits, this mineral is reported to be dis- 

 covered in considerable quantity int-ermixed with quartz, 

 apparently in connection with a decomposed dark-brown 

 garnet rock. The formation containing the imbedded 

 mineral is said to be of great width, and to be about 100 

 feet above, and 12 chains distant from, the sea-level. The 

 locality is about a quarter of a mile from Grassy River. 



