260 Third Supplement to Dana's Mineralogy. 
Figure 1 is on from Greg’s figure. It a the crystal flattened par- 
ans ST Figure 2 is the normal form of the crystals, and correspon nds closely 
him 
ented 
It remains to be ascertained whether there is ema Rhodonite with a monoclinic 
form; in other words, whether Fowlerite or Paisbergite is not true Rhodonite.} 
Sat-ammontac [p. 92.)—Reported by Scacchi as forme dat Vesuvius at the ery vt 
tions of 1855, but, as usual, where - Se has spread over soil with vegetation. It 
a presented ~ — of the rhombic dodecahedron with cavernous fac 
_in 1850, it occurred in 
aLt [p 90, and S ome cmon by Scacchi as anne the products of the . 
Pp 
Vauves eruption of 1855, (Op. cit.. p. 183,) occurring at a mall cone of erup- 
tion. in small cubes, incrustations, salient. Some chlorid of potassium, and also 
sulphate of potassa exists with the common salt in the stala Scacchi also 
anno occurrence of chlurid of magnesium i “the saline crusts, 
together with t anganese. The last was detected among the s 
ucts eruption of 1855 (op. cit. p. 181.) It was detected in the crust by 
treating it with met ao water and testing with we of potassium, when 
whit ip wn down acquired after a while al 
Srereentine [p. 282, he and Suppl. 1, 1.J—The pg! pee on Me Roxbury and 
other places, Vermont, has been analyzed by A. A. Hayes (Proc. Bost. Soc. N H,, 
Dee. 1B. and July 1856, and Am. J. Sei. xxi, 382 4 ‘and shown ~ cost largely of 
oo of magnesia ; the associated white spar is this species pure. He regards 
t -k as made up of this carbonate along with different silicates. AS average of 
the rock of Roxbury afforded 38:00 of the car se yi and 6200 of associated min- 
erals, The rock of Proctorsville, Vt., ware e 33: Me é. leaving 66 35 for ig 
rest, pitiog ¥ Si 36°10, Mg 18°70, Fe, Ma 6 "3-40 40, Al 113, iy mic iron 0°92, 
H62i= another specimen of the same, the magnesite to 
ait ce was 2640. Ty 60.—The magnesite is attacked ty watts acid with great 
same serpentines had ee previously examined by Dr. Jackson, who states 
co still I holds (Proc, Bost. Soc. N. H., Feb. and July, fey that excluding the veins 
and ixture of eaiticuiats of m en the serpentine has the usual compo 
sition, being a hydrous silicate of magnes 
Sriver ia 15].—A few filaments of native silver observed at a copper mine 
mile from Cheshire barytes mine, Ct.—S. Smith, in Proc. Pat Assoc, ix, 188. 
Smrrnsontre [p. 447, and Suppl. ee oe of Smithsonite Bors the 
form of dolomite have been ohisar ed at the Lancaster zinc mines—W. J. Taylor, 
Am. J. Sci., [2], xxi, 427 
Spuene [p. 268].—A pulverulent ho chs sphene affording reactions for water 
ve 5 sen _ pas oe acid, has been named Xanthitane by C. U. Shepard (Am. 
(2), xx color pate yellowish white ; lustre aeGng tis hard- 
pein 35; 37-80 No analysis has been made, Found in a decom posing 
feldspar, associated with zircon, at Green river, Henderson Co., N.C. 
Srannite [p. 512.)—Analysis by Bischof (Chem. u. phys. Geol.,, ii, 2026). 
i n l a ign. 
5157 38°91 453 = ‘O16 0-43 = 99°15 
It appears hence to be a mixture of different substances. It is probably a erst 8 
cali — feces « in which ti n ore has replaced much of the original ingr 
with a small cvtlehich dal fraectur 
Stavrotipe [p. 261 6 i ag at the Lead mine, Canton . Georgia, in n the quartz 
quartzose unica slate which is the gangue of the vein, sometimes penetrating 
a ‘and re. The sta i 
