APPENDIX 
To the Report from the Mineralogical and Chemical 
Department, containing notices of some rare or 
interesting minerals recently found in the State 
of New- York. 
Brown Spar^ or Ankerite. 
This mineral was found by Dr. Emmons in Johnsburgh, in the coun- 
ty of Warren. The same or a similar species.; also occurs at the Pa- 
rish ore bed, in St. Lawrence. Colour, reddish-brown. Primary 
form, a rhombohedron. The angle is about 106°, but the faces of the 
crystals are sometimes curved. 
Hardness, about 3.5. Specific gravity, 2.881. 
Before the blowpipe it decrepitates, but at length becomes of darker 
colour and is slightly attracted by the magnet. Soluble with effervescence 
in dilute muriatic acid. An analysis of a specimen received from Dr. 
Emmons, gave the following results, in 100 grains : 
Carbonic acid, 45.00 
Lime, 28.00 
Magnesia, 13.75 
Protoxide of iron, 11.25 
Moisture and loss, 2.00 
Except in the absence of a small proportion of manganese, the above 
composition is quite similar to that of the ankerite by Berthier.* 
Fibrous Phosphate of Lime. 
This mineral was described by Dr. Emmons, in the second annual 
report of the survey, under the name of Eupyrchroite. 
It occurs in thin mammilated layers, which are fibrous, Colour, 
pale green, sometimes passing into brown. Dull and opaque. Spe- 
cific gravity, 3.06. Hardness, — 4. 
Having ascertained the nature of this mineral, I dissolved a weighed 
portion in muriatic acid, and to the solution added sulphuric acid. I 
next added alcohol ; threw the whole on a filter, and washed the result- 
ing sulphate with the same liquid. From the weight of the sulphate 
of lime, after ignition, I deduced that of the phosphate of lime in the 
* Traite des Essais par la vole Seche, I. 494, 
