360 Sixth Supplement to Dana’s Mineralogy. 
TRICHALOCITE, Hermann.—A green ge of — og the Turjinsk Cop- 
r Mine, resembling tyrolite, described by ann (J. f. pr. Chem., ]xxiii, i 
a ; H=2°5. BB. decrepitates vil a water and bescat es dark- 
fuses on charcoal in ie outer flame to a pearl, and in the inner vied a bead d of 
copper. Composition: 
As 38°73 B 0-67 Ou 44 H 1641= 
whence, the oxygen ratio for H, 8, As, 5:27:5: 3° “4 Taking it at 5: me 5 the formula 
Gus As+5H. 
Ustontrz [p. 239].—The unionite of Silliman has been re-analyzed by G. J. 
Brush, on a part 7 i = one nal s a as men examined by Silliman, and found to be a 
white lime-epidote, Itc conta: 
Si Be Ca Meg ign. 
40°61 33°44 0°49 24°13 trace 2°22 
Specific gravity 3- et The aga Peaage trig by Smith and Brush were ee 7 
by them from Silliman, jr., but o ae Praga who sent them 
Silliman, they were ek the true paioniie. This vol., p. 6 
Zeouites.—Mr. Daubrée has given an account (tit No. ee 6, June, et f= of 
Zeolites now forming from the thermal waters mbiéres 
old Roman aqueduct. Among the species, the oto. common a chabazite 2 and 
lis i aren sti ite 
s th are in fine The 
sae re iy ae in the — mortar, which shows that their elements are 
deri in which they occur. Besides mee the followieas are also 
cera anaes with some doubt , seolecite, harmotome, gi anene hydrated ear- 
bownte: 2 magnesia, in pearly plates (the plates rhombic, optical y biaxial in 
ane normal to that of the imine = Shows are also in the cavities F the 
bya , boas “iaierie of opal, and aragonite in acute bipyramidal crystals, 
of thermal wate 
erves, sustain the Gichialort ‘that the zeolites filling 
cavities in rocks were 0 aqueous cig "hi subsequent in formation to the im 
cluding rock. 
Appendix. 
Furnace anita aire it - lead and silver furnace - = & Holz- 
hexagonal crystals o mpound of antimony, copper, and nickel, have been 
pd snk by F. ‘Sandberger ‘eae: ciii, 526). They consist of Aanieneaky o 57, copper 
82°73, nickel 8°97. 
by the ers in Brunswi Fr 
Sones and perfect for class siinstvatiod, are sold by sat 
They are made of ty glass; the ae 
with the fundament 
in 
of this to the writers Mineralogy, first 
of 50 models, of precisely t , were 
ition of the Mineralogy has contained * 
method (frst edition at p. 28, and the last at p. 82). 
pe we 
commend 
y is taught. The charge 
