192 THE MINERALS OF NEW SOUTH WALES. 



Oolitic Limestone. — A limestone of this structure is said to occur 

 on the Page River. 



Concretions. — Calcareous concretions are common in the black 

 and chocolate coloured soils of igneous origin, which occur in 

 various parts of the Colony, such as on the Liverpool Plains, New 

 England, Gwydir district, Hunter River district, and at Scone, and 

 in numerous other localities where there is a soil derived from the 

 decomposition of a basaltic or other igneous rock. 



Strontianite. 



I have not yet met with any strontium minerals in New South 

 Wales. 



Apatite. 



Chem. Comp. : Chloro-phosphate of calcium. Crystallizes in the 

 hexagonal system, in the form of six-sided prisms. It is reported 

 to occur in well-formed crystals with bitter spar on the Lachlan, 

 between Boco Pock and "Wog-wog, and with graphite and quartz at 

 the head of the Abercrombie Piver ; also on the Clarence Piver. 



This mineral is of considerable commercial value. 



Wavellite. 



Chem. Comp. : A hydrated aluminium phosphate. A yellow 

 mineral, reported to be Wavellite with a radiate structure is 

 found in the fissures of felstone pebbles common in Pat's Castle 

 Creek, Two-mile Flat, Mudgee. 



Fluor Spar. 



Chem. Comp. : Calcium fluoride. Crystallizes in the cubical 

 system. 



Up to the present it has apparently only been found in the 

 massive state, or in but very imperfect octohedral crystals. This 

 mineral has been met with in several places in the New England 

 district, near to Inverell, at Elsmore ; at the Boundary, Sydney 

 and Caledonian Tin Mines, on Cope's and Middle Creeks, where it 

 is found in association with tinstone, a green steatitic clay, copper 

 pyrites, galena, quartz, molybdenite, and other minerals, all of 

 which may often be seen in one hard specimen. 



It also occurs at south Wiseman's Creek in association with 

 copper ores ; in certain cases the fluor is much fissured, and the 

 cracks are filled in with red oxide and blue carbonate of copper, 

 which impart to the mineral a very pretty and ornamental appear- 

 ance, and it would in consequence probably serve for inlaid work. 

 At Woolgarloo Lead Mines it is found in the massive state as the 

 matrix of galena ; it is usually opaque or but semi-translucent 

 white with pale-bluish or purple veinings. 



At Mount Lambie Mr. Wilkinson reports its presence in the 

 Devonian beds. 



