MlNBKALOr.lCAL NOIKS ANDKRSON. 



123 



MEAN ANrJLKS. 



Lancewood Tin Mines, Chillagoe, Queensland. 

 (Plate xxxvii., fig, 3.) 



This is a bluish crystal of donial habit measuring 13 x 16 x 1-5 

 cm. It is simple with / (021), m (110) and I (120) largely de- 

 -veloped ; the faces of h (010), M (230), and o (221) are small. The 

 prisms are strongly striated and o and / are much worn towards 

 the apex. 



TETRAHEDRITE. 



Hercules Mink, Mt. Read, Tasmania. 

 (Plate xxxvii., tig. 4.) 



A hand specimen from this mine carrying crystallised tetra 

 hedrite was lent to me for description by the late Mr. W. F. 

 Petterd, of Launceston. The tetraheilrite, in minute but beauti- 

 fully formed and brilliant crystals, occurs with rhombohedral 

 calcite and siderite in small vughs of the country rock, which con- 



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