74 
“irregular strings, lying at all angles, and in lumps in layers. 
“Tn one of the faults in this cliff is a vein of a pale bluish 
“Celestite ; this mineral is abundant in the marls, both at 
“Bitton and Wickwar.” Passing from the Keuper Marls of 
Aust Cliff, we come to the mineral discovered in considerable 
quantities in the vicinity of Yate, whence it has been largely 
extracted ; the finest crystals of the Celestite from this neigh- 
bourhood were yielded by the limestone, in cavities and fissures. 
Some are massive: others in large crystals of modified rhombs, 
tabular and often of ruddy hue. Specimens of fine crystals 
from this part have been kindly given to the Gloucester 
Museum by Mr Madan, M.A., &c., of Exeter College, Oxford ; 
and to the British Museum by Lord Ducie, whose scientific 
knowledge enabled him to develop at Yate the industrial ex- 
traction of the mineral. At Wickwar the specimens show 
small reddish crystals, comparatively poor, and often of a 
saccharine character, owing to unfavourable thermic conditions. 
At Tortworth, Celestite is but sparsely produced ; and passing 
northward from this district occurs in lesser or greater quan- 
tities, both in the limestones along the course of the red 
marls as far as Northampton, and Elton, near Nottingham ; 
again appearing at Knaresborough in Yorkshire ; also in North 
Britain at Carlton Hill, by Edinburgh, where it is to be met 
with in the marly shale and limestones that have been upheaved 
by the protrusion of igneous rock; and again at Tantallon in 
East Lothian, in the vicinity of trap rocks. 
The distribution may be now further extended to other 
parts of Europe, that by the short notes given, and the foreign 
situations cited, the general range may be approached. 
In France, this mineral is obtained at Condorcet on the 
Dréme. The specimens thence are mostly from marls and 
limestones, and are in hard compact masses, forming the gangue 
of the rocks, which is 5 métres in thickness, consisting of 
gypsum and marl. 
Other places are—St. Béat in the Department of the 
Garonne, where it is embedded in sulphur; and at Meudon it is 
found in chalk flints, 
