4,30 DOMAIN V. CALCAREOUS. 



Lustre, dull. Opake ; but often translucent on 

 the edges. 



The most common colour is grey, of various 

 tints, and yellow of different shades. It is often 

 veined and spotted in various forms. 



Primitive compact limestone, from the Alps. 

 The same, from the Grampian mountains, Scot- 

 land. 



Primitive limestone, with garnets, from the Py- 

 renees. 



Grey compact limestone, intersected with gra- 

 nular, from the Alps. 



Black compact limestone, intersected with chert, 

 from Derbyshire. 



The same, with spots of bitumen. The black 

 colour often arises from the bitumen, as appears 

 from the stones becoming white when calcined. 



Limestone, of a dull white colour, from Port 

 Rush, in the north of Ireland. This stone, which 

 has sometimes been called chalk, supports the 

 celebrated basaltic columns around the Giants* 

 Causey. It abounds with fossile remains, and no- 

 dules of dark flint: for the depth of sixty feet 

 under the basaltin it is impregnated in a singular 

 manner with small particles, mostly oval, of the 

 basaltin; and, from the mixture of colour, is vul- 

 garly called mulatto stone. A most singular ge- 

 ological fact. 



