MODE IX. MAGNESIAS LIMESTONE. 



penetrated the felspar, and imparted its usual 

 green colour, whence it has received its common 

 appellation. 



It is found in the Vosges mountains in France, 

 and there is a manufactory at Paris, where it is 

 cut into tables, vases, chimney-pieces, and other 

 articles of decoration. 



The fracture has the soft unctuous appear- 

 ance of a magnesian rock, and the obscure green 

 colour is a further characteristic of that class of 

 stones, so that there seems little doubt but it 

 must belong to this Domain. 



Similar granitels are found, it is believed, in 

 Westmoreland, and in Ireland. Occasionally 

 some crystals of the felspar are large and regu- 

 lar, when it assumes the form of a porphyry. 



MODE IX. MAGNESIAN LIMESTONE. 



Many limestones are so much impregnated 

 with magnesia, that their qualities become al- 

 tered, and they are injurious to vegetation. 

 According to Dr. Kidd, the limestone of parts 

 of Derbyshire, Nottinghamshire, and Yorkshire, 

 is of this kind; and at Matlock the limestone 

 of the rocks on the side of the river where the 

 houses are built is magnesian; on the other 



