BY W. F. PETTERD, C.M.Z.S. 51 



84. CiMOLiTE (Hydrous Silicate of Aluminium). 



A white clay-like substance, apparently identical with 

 that known under this name, occurs as a deposit near St. 

 Leonards, and is often termed locally "' meerschaum." It 

 is of a smooth compact texture, with a dead-white colour 

 and subconchoidal fracture. 



85. Clinochlore (Basic Silicate of Magnesium, and 



Aluminium). 



A monoclinic member of the chlorite group that often 

 occurs in fairly well formed, large crystals. It has a dis- 

 tinct micaceous structure and a somewhat pearly lustre. 



Near North Mt. Heemskirk it occurs in large masses that 

 occasionally show crystalline bunches, with a sporadic well- 

 developed crystal. The colour is the characteristic pale 

 metallic-green. At Anderson's Creek it occurs in minute, 

 almost microscopic, radiating bunches of a shade of green 

 that is somewhat darker than usual (W. H. Twelvetrees). 



86. Coal. 



River Don ; Mersey ; Port Arthur ; Seymour ; Schouten 

 Island ; South Cape ; near Waterhouse ; Three Hut Point ; 

 New Town ; York Plains ; Eastern Marshes ; Jerusalem ; 

 Cullenswood ; Mt. Nicholas ; Sandfly ; Adventure Bay : 

 Port Cygnet ; Hamilton ; Richmond ; Prosser's River ; 

 Spring Bay ; Mt. Munro ; Fingal ; Longford : Jericho ; 

 Inglis River ; Mersey River ; Western Bluff ; Gad's Hill ; 

 Magnet Range ; Henty River. 



Full detailed descriptions of our bituminous coal 

 measures, with numerous analyses of samples, will be found 

 in the Proceedings of the Royai Society of Tasmania, 1851, 

 Johnston's '' Geology of Tasmania," 1888, and in the Tas- 

 manian Official Record, 1892 ; also in the geological 

 reports published by the Mines Department. 



Variety — A u th racite. 



" This occurs in irregular grains up to ^-inch in size, 

 enclosed in calcite and siderite, in the abandoned lead mine 

 North Valley, Mt. Bischoff. The grains are of dense black 

 colour with splendent lustre, and frequently iridescent 

 tarnish ; fracture conchoidal. This interesting and rare 

 occurrence of a mineral coal in an ore-lode is also recorded 

 from ore-lodes of several mining districts in Germany " 

 (Ulrich). 



In the workings of various quartz reefs in the Beacons- 

 field goldfield a hydrocarbonaceous substance occurs which 



