SdO Giibs &n Tourmalines, ^c. 



the exterior crystal. Sometimes a thin layer of talc interrenes 

 between the outer and inner crystal. In one specimen I 

 found three crystals of the red aggregated together, and en- 

 closed in one of the green. In another crystal I found pyrites 

 in the place of the red tourmaline. The largest crystal of 

 the red was one quarter of an inch in diameter, and four 

 inches long. The red tourmalines vary in intensity of colour, 

 and frequently (particularly in the interior) pass into violet. 

 They pass from translucid to semi-transparent. I have found 

 some that were terminated by triedral pyramids. The crystals 

 are generally perpendicular to the sides of the vein. Small 

 crystals of the red often run from the vein of quartz into the 

 adjoining feldspar. The granite also contains minute crys- 

 tals of dark and light blue tourmaline, and pale green eme- 

 rald, with a very few garnets and pyrites. In the lower part 

 of the vein, five to six feet from its interruption by the mica 

 slate, the red tourmaline scarcely appears, and the vein con- 

 tains chiefly bluish amorphous quartz and green tourmaline. 

 It is therefore probable that this vein will not afford hence- 

 forward a great supply of this beautiful mineral. 



About six miles from Chesterfield, in Goshen, is found the 

 rose mica, with tourmalines and emeralds interspersed in the 

 granite. Unfortunately the bed of granite has not been dis- 

 covered, and the specimens we possess are taken from loose 

 rocks, scattered over a small extent of ground in a valley, in 

 the neighbourhood of mica slate. The rose mica is found in 

 a large grained granite with amorphous quartz and silicious 

 feldspar, crystallized and amorphous. The mica is generally 

 of a rose red, sometimes yellowish green. It crystallizes in 

 rhomboidal tables, rarely truncated on the acute angles, 

 passing into the hexaedral table. The tourmalines are light 

 and dark green and blue, of various shades of intensity, fre- 

 quently acicular and stellated. The black, the red, and the 

 violet tourmalines also occur, but more rarely. Sometimes 

 the green prisms enclose others of blue and black. Specific 

 gravity of these varieties from 3. to 3.1. The green and blue 

 crystals in this locality are translucid or semi-transparent. 

 The feldspar is generally white, rarely light blue. There are 



