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DESCRIPTIVE MINERALOGY. 
to pearly. In thin plates, translucent. Brittle, and easily frangible. Hardness 3.5. Specific 
gravity from 3.70 to 3.90. Infusible before the blowpipe. Partly soluble, with effervesence, 
in nitric and muriatic acids. 
Composition. Specimen from Stromness, in one of the Orkney islands. Carbonate of 
strontia 68.60, sulphate of baryta 27.50, carbonate of lime 2.60, oxide of iron 0.10 {Trail). 
Although I have introduced the above description of this mineral, it is by no means certain 
that it is entitled to the rank of a distinct species. The only fact in favour of the latter view 
is, that according to the above analysis, the carbonate of strontia is in the ratio of four atoms 
to one atom of sulphate of baryta. This, however, may be accidental. 
LOCALITIES. 
Oneida County. A mineral was many years since found near Hamilton College, which 
agrees very well with the above description; and Dr. Emmons supposes the same mineral to 
occur in Schoharie county. 
ORDER III. LIME. 
This order embraces the following species: 
1. Carbonate of Lime. 
5. Apatite. 
2. Arragonite. 
6. Fluor Spar. 
3. Gypsum. 
7. Muriate of Lime. 
4. Anhydrite. 
8. Datholite. 
9. Pharmacolite. 
CARBONATE OF LIME. 
A mineral yielding caustic or quicklime by calcination ; soluble with effervescence in dilute 
nitric or muriatic acids : the solution affording an abundant precipitate with oxalate of ammo¬ 
nia. 
There are several important sub-species or varieties, which it will be convenient and proper 
to notice separately. 
