MISCELLANEOUS MINERALS. 499 
It may be reckoned that the rock would yield from 24 to 26 per cent, 
of metallic iron. The presence of so much carbonate of lime would not 
necessarily be injurious, as the material would act as a flux in the smelting 
process. 
Prof. Judd mentions that at several localities in ancient times, 
and at Bottlebridge, near Overtoil Longville, in recent years, 
small quantities of ironstone have been obtained for smelting 
from the Great Oolite Clay : but the quantity of material that 
had to be removed and the small amount of ironstone led to the 
abandonment of the workings. He also states that in the 
neighbourhood of Lower Benefield near Oundle, and probably 
elsewhere, the ironstone-nodules at the base of the Upper 
Estuarine Series have in former times been dug for the purpose 
of smelting.* (See p. 416.) 
Ochre, 
Red ochre has been obtained from the Northampton Beds at 
Clipston, south-west of Market Barborough, and yellow ochre 
from the strata at Finedon (or Thingdon) near Wellingborough. 
Miscellaneous Minerals. 
The occurrence of detrital mineral fragments has been referred 
to on p. 10. Mention has also been made of the common occur- 
rence of Selenite, Calcite, Aragonite, and Pyrites. 
The following Minerals have also been found among the Lower 
Oolitic rocks : 
A silicate of alumina, allied to Allophane, was found by Dr. Charles 
Berrell in crevices of the Northampton Sand, at Northampton. 
This is probably due to the decomposition of mineral substances 
from the overlying strata. (W. D. Herman, Quart. Journ. Geol. 
Soc., vol. xxvii. p. 234.) 
An aluminous mineral was recorded by Prof. Morris (as 
Websterite ?) from a ferruginous band at the base of the Upper 
Estuarine Series at Corby in Lincolnshire (Quart. Journ. Geol. 
Soc., vol. ix. p. 328). Prof. Hull also notes the occurrence of a 
similar mineral in the Oolite at Lyneham Barrow, near Sarsden 
(Geol. Woodstock, p. 16). 
Burytes (Heavy Spar). Sulphate of Baryta, Inferior Oolite, "Whatley, 
Somerset. 
SeeJcite. Annulated Chalcedony, Inferior Oolite (freestone), 
Dundry. 
Gelestine. Sulphate of Strontian, " Oolite," Collier's Lane, near 
Bath. (T. M. Hall, Mineralogists' Directory, 1868, p. 67.) 
Calcimine. Carbonate of Zinc, Inferior Oolite, near Nunney : no 
doubt detrital. 
Galena. Inferior Oolite, near Frome : detrital. (Lonsdale, Phil. 
Mag., ser. 2, vol. ii., p. 234 ; Rev. O. Fisher, Geologist, vol. vi. 
p. 29; C. Moore, Quart. Journ. Geol. Soc., vol. xxiii. p. 488.) 
* Geol. Rutland, &c., pp. 194, 215 ; Porter, Geol. Peterborough, p. 92. 
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