222 DESCRIPTIONS OF MINERALS. 



action with acids, from allied minerals that are not carbon- 

 ates; by yielding no metal, from cerussite, and by tingeing 

 the flame green, from strontianite. 



Obs. The most important foreign localities of witherite 

 are at Fallowfield in Northumberland (where it is mined). 

 Alstonmoor in Cumberland, and Anglezark in Lancashire. 

 It is also found in Silesia, Styria, and Sicily. In the United 

 States it occurs at Lexington, Ky. 



Witherite, from Fallowfield, is used in chemical works, in 

 the manufacture of plate glass, and in France in the manu- 

 facture of beet sugar. 



Bary toe alette. Occurs at Alstonmoor in Cumberland, England, in 

 "whitish monoclinic crystals. H. =4 G. =3 6-3 "7. It is a barium- 

 calcium carbonate. 



Bromlite is a trimetric mineral, of the same composition, from 

 Bromley Hill, near Alston, and from Northumberland, England. 



Oelestite. — Strontium Sulphate. 



Trimetric. I A 1=103° 30' to 104° 30'. Crystals rhombic 

 prisms or tabular ; often long and slender. Cleavage dis- 

 tinct parallel with /. Mas- 

 sive varieties : columnar or 

 fibrous, forming layers half 

 an inch or more thick with 

 a pearly lustre ; rarely gran- 

 ular. Color generally a 

 tinge of blue, but sometimes 

 clear white or reddish. Lus- 

 tra vitreous or a little pearly; transparent to translucent. 

 R. =3-3-5. G. =3-9-4. Very brittle. 



Composition. Sr 4 S = Sufphur trioxide 43-6, strontia 

 56*4=100. B.B. decrepitates and fuses, tinging the flame 

 bright red to a milk-white alkaline globule, which gives 

 an alkaline reaction. With soda on coal fuses to a mass 

 which when moistened blackens silver. 



Diff. From barite, which it resembles, it is distinguished 

 by the bright red color it imparts to the blowpipe flame, and 

 its less specific gravity ; and from the carbonates, by not ef- 

 fervescing with acids. 



Obs. Celestite is' found in beds of sandstone or lime- 

 stone, and also with gypsum, rock salt, and clay. A bluish 

 celestine, in tabular and prismatic crystals, occurs at Stron- 

 tian Island, Lake Erie • Scoharie, Lockport and Kossie, N. 



