188 GEOLOGY, &C. OF A 



The Carbonate of Lime is white ; its structure is 

 coarse-grained, crystalline : the grains, which are 

 generally about the size of a pea, after having been 

 exposed to the action of the atmosphere, for a consi- 

 derable length of time, are easily separated between 

 the fingers. In one place I saw a bed of reddish- 

 brown Serpentine, throughout which small specks 

 of Bronzite were thickly interspersed ; it was ap- 

 parently situated in Sienite. It was impossible to 

 ascertain the order of the strata ; they appear to dip, 

 towards the north-east and north, and were much 

 interrupted and broken. 



Garnet Resinite. 



This mineral, constitutes almost the whole of the 

 large bed in the primitive Trap at Willsborough, 

 mentioned in the preceding Geological sketch ; its 

 colour in the mass, is brownish-black and reddish- 

 brown ; by transmitted light, hyacinth-red, inclining 

 to crimson ; by exposure to the air, many specimens, 

 become beautifully iridescent ; external lustre, semi- 

 metallic ; internal, resinous : translucent : form, inde- 

 terminable : fracture, slightly conchoidal : structure, 

 coarse, and fine grained, and compact ; grains feebly 

 adhering. Specific Gravity 3. 52, 



Common Gamet. 



This accompanies the preceding : colour light hy- 

 acinth-red : lustre, resinous : transparent : struc- 

 ture, granular ; in some specimens indistinctly la- 



