64 J. Lawrence Smith on Emery. 
. 
The minerals which are brought under this species are the 
chloritspath or chloritoid of the Ural, the Sismondine of St. Mar- 
cel and the Masonite of Rhode Island ; their analyses and form- 
mule are as follows :— 
Oxy- Oxy- Oxy- Oxy- | Oxy- Oxy- 
‘ gen.| Ib gen. HL ren. AY gen. | N ee Vi gen. 
Silied,.. 3. 27-48 6 |24-40| 2 | 241) 9 |28:27) 6 25:18! 5 | 23-91] 2 
Alumina, . . |35°37 6 |45°17| 3 | 442) 15 |82°16] 6 /83°61] 6 | 3952) 3 
Protox. of | 
SET OD, ‘eses let OD 8 |80°29| 1 | 288! 4 |83°72| 8 85°31) 3} 28:05] I 
Magnesia,..| 4-29 | 
Water;:.... 3 16:55 1 BOO 21 S8Rre Sth VeOR ES 
I. Chlorite spar or Chloritoid of the Ural by ep oh Mg)*Si+-Al? Si+3H. 
Il. Chlorite spar of the Ural, Erdmann. Fe* 3 
III. Sismondine of St. Marcel, Delesse. Fe4 pallies tL 
IV. Masonite of Rhode Island, Whitney. Fe? SitAl Site. - 
V. Chlorite spar according to Rammelsberg requires, 3R* Si+2A1? Si+6H. 
VI. Chloritoid of Asia Minor, J. L. Smith, 1? Site? Sis. 
This nay is oan very abundantly with the emery of Gu- 
much-dagh ; ers the surface of the blocks, and sometimes 
enters ely He en substance of the emery. It is easy to see 
rom the composition of this mineral, that it is formed by elimi- 
nation from the mass of emery at the time of its consolidation, 
which by this means tends to purify itself. The nodule of 
chloritoid. Its composition is not in perfect accordance with the — 
nown varieties of chloritoid, and differs from Sismondine (which 
it approaches most in composition) by its imperfect solubility in 
hydrochloric acid. 
Black Tourmaline.—This mineral is found abundantly with 
the emery of Naxos, and also in small quantities with that of 
other localities. It appears to have replaced the chloritoid that 
is found so abundantly with the emery of Gumuch-da 
The crystals are found agglomerated on the surface, and also 
disseminated in the interior of the emery. This mineral like the 
last is aeeey basic, containing a little more than thirty per 
cent. of sili 
Chlorite.—With the emery of Gumuch-dagh we find a chlo- 
rite. It is in compact masses composed of an agglomeration of 
small crystalline plates, and contains octahedral crystals of mag- 
netic oxyd of iron. Anpye gives as its conn : 
