TABULAR SPAR. 141 



Chillips ore bed, Putnam county, N. Y., and in Burke and 

 Scriven counties, Georgia. The Suanna spring in Georgia 

 affords small quantities of siliceous sinter. 



2. LIME. 



The silicates and borosilicate of lime gelatinize readily 

 and perfectly with muriatic acid. In hardness they are noJ 

 above feldspar, (6,) and their specific gravities do not exceed 

 3. They fuse before the blowpipe with different degrees of 

 facility, affording no metallic reaction. 



wollastonite. — Tabular Spar. 



Monoclinic. Rarely in oblique flattened prisms. Usual- 

 ly massive, cleaving easily in one direction, and showing a 

 lined or indistinctly columnar surface, with a vitreous luster 

 inclining to pearly. 



Usually white, but sometimes tinged with yellow, red, or 

 brown. Translucent, or rarely subtransparent. Brittle. 

 H=4— 5. Gr=2-75— 2-9. 



Composition : silica 52, lime 48. Fuses with difficulty to 

 a subtransparent, colorless glass ; forms with borax a clear 

 glass. 



Dif. Differs from any carbonates in not effervescing with 

 acids ; from asbestus and nemalite in its more vitreous ap- 

 pearance and fracture ; and from these and tremolite in its 

 forming a jelly with acids ; from natrolite, scolecite and dys- 

 clasite in its very broad sw&-fibrous cleavage surface and 

 more difficult fusibility ; from feldspar in the lined appear- 

 ance of a cleavage surface and the action of acids. 



Obs. Usually found in granite or granular limestone ; 

 occasially in basalt or lava. 



At Willsboro', Lewis, Diana, and Roger's Rock, N. Y., 

 it is abundant, of a white color, along with garnet. At 

 Boonville, it is found in boulders with garnet and pyroxene. 

 Grenville, Lower Canada, and Bucks county, Pennsylvania, 

 are other localities. Occurs also at Kewenaw Point, Lake 

 Superior. 



What are the prominent characters of the silicates and borosilicate 

 of lime % What is the color and appearance of tabular spar 1 Of what 

 does it consist 1 How does it differ from the carbonate* ? how from 

 asbestus, tremolite, and feldspar] 



