110 VOLCANIC AREA OF EAST MORETON, ETC.. DISTRICTS, Q , 



Originally this rock was an augite felspar rock like porphyritic 

 diabase in which the augite has altered to anthophyllite and the 

 -felspar to epidote and chlorite. 



Name : Anthophyllite Schist. 



Sp. No.68. Epidote- Actinolite-Topaz Schist. Loc: Leacy's Ok., 

 Upper North Pine. 



i. Handspecimen a greenish, tine-grained schistose rock with 

 bluish-green specks of chlorite (delessite). 



ii. (1) Holocrystalline, very fine-grained and allotriomorphic 

 granular. 



(2) Essential minerals are epidote, felspar (orthoclase), actino- 

 lite altering to chlorite, chlorite (var. delessite) and calcite. In 

 smaller proportions quartz, topaz, magnetite, sericite and cordi- 

 erite occur. A minute quantity of sillimanite in minute needles 

 is also present. 



Name: Epidote- A.ctinolite-Topaz Schist. 



Sp. No. 102. Epidote-Cordierite-Chlorite Schist. Loc: Leacy's Ck- 

 i. In handspecimen this is a fibrous green schist like Sp. No. 



68. 



ii. Under the microscope it is found to consist of epidote, 



cordierite, delessite calcite, apatite and magnetite. 

 Name : Epidote-Cordierite-Delessite Schist. 



Sp. No.107. Albite -Chlorite Schist. Loc: Leacy's Ck. 



i. This specimen, obtained near the preceding, is of a somewhat 

 similar appearance. 



ii. It contains, however, less epidote and more calcite. Its 

 felspar consists of both orthoclase and albite, of which the latter 

 is the more abundant. Minute needles of sillimanite occur 

 plentifully in the felspar. 



Name : Albite Chlorite Schist. 



Specimens 68, 102 and 107 are somewhat weathered actinolite 

 schists, in which the original actinolite has been altered wholly 

 or partly to chlorite. They probably represent a highly altered 

 lava of intermediate composition whose constituent felspar has 

 been recrystallised as calcite, albite and orthoclase. 



