Dr. Meade's Localities of Minerals. 5$ 



minerals 1 have also noticed the titane ailiceo-calcaire^or 

 sphene; it occurs disseminated in the granular limestone in 

 irregular grains as well as beautifully crystalized; the form 

 of the crystals are rhomboidal prisms with diedral summits 

 similar to those which are found accompanying the pyrox- 

 ene both at Ticonderoga and at Sparta, but the colour is 

 darker being a clove brown with a fine metallic lustre. — 

 Fine specimens of tremolite are also found here intimately 

 mixed with the carbonat of lime; it is in large and distinct 

 crystals, structure foliated, of a pearl white colour and sil- 

 ky lustre, highly phosphorescent either by heat or friction. 

 Intersecting the limestone at Bolton lie beds of white 

 quartz as at Kingsbridge: imbedded in this quartz rock fine 

 specimens of scapolite are to be found; it occurs massive 

 constituting a considerable part of the rock, in distinct con- 

 cretions, and crystalized ; colour pearl white, the crystals 

 are generally opaque but sometimes translucent, their form 

 a four sided prism, the two lateral edges of which are in- 

 clined at angles of 93, and the other two at angles of 87, 

 the lateral edges are generally truncated by planes which 

 form with the corresponding sides of the prism angles 

 of 133, fracture foliated, cross fracture fine grained, and 

 uneven, sufficiently hard to scratch glass, easily frangible, 

 phosphoresces slightly on hot coals, fuses before the blow- 

 pipe with intumescence into a white enamel, some of the 

 crystals are from one to two inches in length, and half an 

 inch in diameter, they are slightly streaked longitudinally, 

 and have been at first sight mistaken for white beryl, but 

 their crystaline form has on examination no resemblance, 

 indeed the character of scapolite is strongly marked in the 

 appearance of many of the specimens which consist of 

 groupes of acicular crystals aggregated into thick fasciculi 

 composed of parallel or diverging fibres. The crystals 

 are imbedded in a friable vitreous quartz, and can be easi- 

 ly dissected from their matrix in which they are rather 

 loosely invested ; by this means groupes of large and dis- 

 tinct crystals can be obtained. It does not appear that there 

 is much difference between scapolite and augite either in 

 their chymical characters or crystaline form; indeed Haiiy 

 considers scapolite and elaolite as only varieties of pyrox- 

 ene: the most distinguishing character that I perceive is, 

 that scapolite is ealy fusible into a white enamel, while 

 tlie augite is very infusible before the blowpipe; this show^. 



