£ 
= Dr. Meade’s Localities of Minerals. 53 
minerals I have also noticed the titane siliceo-calcaire or 
sphene; it occurs disseminated in the granular limestone in 
irregular grains as well as beautifully crystalized; the form 
of the — are rhomboidal prisms ‘with diedral summits 
similar to t which are found accompanying the py 
ene both at Pideudanigs 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 mtimately 
mixed with the carbonat of lime; it is in large and distinet 
crystals, structure foliated, of a pearl white colour and sil- 
ky lustre, mghly phosphorescent either by heat or friction. 
Intersecting the limestone at Bolton lie beds of white 
quartz as at Kingsbridge: imbedded in this quartz rock pom 
specimens of scapolite are to be found; it occurs massi 
a a ee part of the rock, in distinct ies 
pneiicis 3 rystalized ; colour pearl white, | the crystals 
Uh t, their form 
fe esemne? gee 1, the two lateral. edges of which are i 
clined at angles of. 93, and the other two at angles of 8’ 
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, ri are slightly streaked Jongitudinally, 
and have been at sight mistaken for white beryl, but 
their crystaline aa 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 per 
composed of parallel or diverging fibres. The c tals 
are imbedded in a friable vitreous quartz, and can be ose 
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. Itdoes 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 
the augite is very infusible before the blowpipe; this shows 
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