33 
The above, together with the several Veins of Coal, I believe, constitute 
the whole of the Mineral commercial products of the Forest of Dean, with 
the exception of an excellent Fire Clay, which is found just above the 
Heemitite series. 
Our Clays are rich in Aluminium, and I have struggled hard to extract it 
on a cheap principle by means of an Electrical Furnace (before Dr. Siemens 
introduced his,) but have hitherto only partially succeeded. 
Minerals of Gloucestershire. By Dr. FrEDK. SM1THE, F.G.S. 
Orthoclase 
Plagioclase 
Augite 
Magnetite 
Olivine 
Porcellanite 
Chlorite 
Chert... 
Prehnite 
Muscovite 
Calcite 
Pyrites 
Do. 
Marcasite 
Mispickel 
Lignite abe ee 
Chalybite (Spathose 
iron of Phillips) ... 
Bole . 
Limonite 
Clay Ironstone 
Githite 
Rhodonite 
Dolomite 
Selenite 
Bitumen 
Arragonite .. 
Alunogen 
Copralites 
Gypsum 5 
Chalcopyrite ... 
Travertine 
D 
Basalts ... ... Charfield 
Do. Do. 
Do. Do. 
Do. Do. 
Do. Do 
Do. Do 
Do. Do 
oe ae aH Damory, Tortworth 
Amygdaloid trap ... Damory and Charfield 
In clays and marlstones Churchdown 
Throughout =e Do. 
Do. ow Do. 
Rhetic ... Garden Cliff, Westbury-on-Severn 
In clays and marlstones Churchdown, &c., &c. 
Rhetic ... Garden Cliff, Westbury-on-Severn 
M. Lias, &c. ... Churchdown, &c., &c. 
Spinatus Beds ... Churchdown 
Tate’s Hill, Churchdown, &c. 
Churchdown 
nad ies Tai soe! 5 5 
Coal Measures ... Iron Acton 
M. Lias ... ... Gretton, Churchdown 
“he . ... Thornbury 
Lias_... ... Churchdown 
U. Lias ... ae Do. 
Ra DEYN ease aes Do. 
U. Lias, Shales ses Do. 
Rhetic Garden Cliff, Westbury, & Hock Crib 
Trias... ... Garden Cliff, Westbury 
Rhetic ... ... Garden Cliff, Westbury, &c. 
Oolite and Lias ... Cotteswolds — Dursley, 
Churchdown, &c. 
