362  —- Ninth Supplement to Dana’s Mineralogy. 
‘a we {I1, IV].—Dr. Genth informs us that he has now in his collection a 
specimen of harrisite containing a nucleus of unaltered galena; thus substantiating 
the arenes of his conclusion that harrisite is copper-glance pseudomorphous of 
galena 
Hatyrye [p. 230].—The blue transparent crystallized haiiyne occurring with 
pyroxene ae mica at Monte Somma, examined by Rammelsberg, (Pogg. Ann., cix,) 
577, gave in two analyses 
Si ( K 
G.=2-464 ; I. 11°25 34-04 undet. 10°89 11°41 2 os 
: 2. undet. 84:08 27°64 10°30 bag 8 ieee 6 
Mean, +105 34:06 27°64 10°60 11°79 496=100'30 
Oxygen, 6°75 1768 12°91 2°89 3:02 0°84 
(a) with traces of iron. 
Subtracting from the oxygen of protoxyds one third of 6°75, or the amount necessary 
to combine with the 8 esent, we have 4°5 remainder, and pe Pigg’ of R, 4, Si 
wil aking silica as SiOz, the formula (RY . The oxygen of 
ombined with § is to that c ith Si og . : 
sequently the formula of the mineral ma ressed as R §+2(R Si+-A! Si), 
wi i+241°Si#=5 11-10, $i 3419, Al 28°51, Ca 10°37, Na 11°48, 
Rammelsberg calls att ation to G. Rose’s observation that sod tag bas Hae ae 
nosean are isomorphou ial silicate (R, ae ee occurs in all; 
contains chlorine, as se asa ain amount o. The f eeieiposition a ‘the 
ree minerals m may be expressed as follows ; 
A. Sodalite = NaCl+n (R, Al, Sit) 
B. Haiiyne yaa aA Xi, Siz) 
C. Nosean =A 
NDITE oni: ]-—A specimen ne aden ema ge Tieger- 
Nitin in etl salon by py tg (Pogg. Ann., cx, 525) lost 1°91 pr. et 
when the air-dried mineral was left for two it ree sifigticns acid, panty 13°5 addi- 
tional on ignition, in all 15°48 pr. ct. Composi 
Si #1 Ca ‘3 N H 
59°63 15:14 6°24 2°35 046 15-48—=99°30 
Oxygen 30°95 707 1°78 0°40 0°12 13-74 
The ratio of R:Al:Si:H is nearly 1:3:12:6, considering the loss of 1°91 as 
brasserie ees the dry mines) couieiie Si 60°97, Al gf -49, Ca 6°38, K 2:40, Na 
0°47, H13 pie ving the oxygen ratio 1:3:12 the s ame as given in the 
Miscraloes Rant rg, however, Becta 3 the eae ratio ge be more correct, 
as the zeolites Sealy part with a portion of a: gs nd 1°91 pr. ct. is too much to 
called hygroscopic moisture, He Nag ‘the formula (Ca, . K, Na)? Si8 + Ais Sio +197. 
whic — the same general formula as stilbite, and in this view thes ——_ 
may 
e rokobe bodies. [It is d 
authors use the name s¢ilbite for the species which the Englis merican a 
thorities call heulandite, and desmine for the mineral we d thee as stilbite— 
G. J. B. 
HJELMITE.—WNordenskiéld, Jour. prakt. Chem., \xxxi, —This 
proposed by Nordenskiéld for a new tantalate found at KKararfihof j in Fi 
Crystalline form, undetermined. Color, jet black; lustre, metallic ; fracture granu- 
] =5°0 streak, blackish-gray. B.B. dec ecrepitates, falls to pieces 
gives off water. “In n oxydizing flame becomes brown, but does not fuse; with salt of 
fan dissolves to yee ee glass; with i ‘sien a colorless glass, 
es opaque on flaming; with soda and charcoal eo — spangles. 
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