Geological Specimens from Tasmania. 429 
It is generally called roofing slate. 
No. 10, Found on the surface of St. Paul’s Plains. 
Tt is compact, granular, primitive limestone. 
No. 11, From St. Mary’s Pass, near Falmouth, East 
Coast. 
This is fine grained granite or gneiss with purple garnets, 
and, I think, with scales of zative gold. 
It is a most singular compound mineral. 
No. 12, From a bed of Rock at St. Paul's Plains. 
This is massive hornblende rock, what some mineralogists 
would designate basaltic hornblende. 
No. 13, From Hunterston, on the Shannon, near Both- 
well. 
This is blende, the sulphuret of zinc. It occurs in primi- 
tive and secondary rocks, and is found principally with sul- 
phuret of lead, iron, and copper, and is common in most 
veins of those substances everywhere. ‘e 
No. 14, From the summit of Mount Wellington, near 
Hobart Town. 
A rare specimen of siliceous oxide of zine. It is highly 
magnetic, and is found in lead and copper mines. 
No. 15, From the Cataract Hill, Launceston. 
Is carbonate of zinc, calamine. 
No. 16, From Lake St. Olair. 
It is grey sandstone coated with calamine. 
No. 17, From elevated ground in the vicinity of an extinct 
volcano in Macquarie Plains. 
This is vesicular lava; some of the vesicles are empty, 
others are filled up with oxide of. zine or calamine. 
No. 18, Volcanic Rock, in which the fossil pine tree at 
Macquarie Plains is imbedded. 
This specimen is also vesicular lava, and coated oyer with 
