Mineralogy and Geology. Q77 
6. Forcherite—The name Forcherite has been given by Avnnorn toa 
ellow opal found in gneiss at Reittelfeld in Styria. An examination by 
L. Maly proved the mineral to be hydrated silicie acid colored yellow 
by es 7 of arsenic.—Jour. pr. Chem., Ixxxvi, 501. 
i 
by chlorhydrie acid, but more rapidly when the mineral is previously 
ignited. Composition : 
i EL Fe Mg Mon,Na Ign. 
39°38 1611 8-65 36°04 100 traces, 031 = 101-49 
P : neo 
m been applied to three minerals: (1) a variety of iolite, (2) to 
datholite, and (3) to scapolite. Pisani suggests the propriety of drop- 
Plug the name altogether— Comptes Rendus, lv, 4 
so the diatom deposit from near the Louisa-spring in Franzensbad. 
Analyses: 1. Upper layer, Bilin. 2. Lower layer, Bilin. 3. Meisters- 
dort. 4. Franzensbad. 
1. 
Ammoni 0:03 0-01 
Potash : 002 0°30 024 0-40 
0-30 tr. he ne 
Magnesi — 0-43 ' 
Lime, 7 0-41 0-44 064 tr. 
Alumina, ferric oxyd, 681 540 5°60 0-91 
Sulphuric acid, 0-12 tr 0°54 — 
Phosphoric acid, 0°24 tr. tr. o-19 
Silica, 74:20 80°30 Lhd db 
Organic matter, 4:20 1:30 3-2 ; 
Water, 13°30 10-90 7-00 6-00 (loss) 
99°63 99:08 10052 10000 
No. 1 is the “tripoli” or polishing powder; it has a density of 1-862, 
Absorbs water ella cating up about 14 times its weight, and splits 
Into thin plates. Density of No. 2 equal 1:944; it is harder than No, 1, 
and not used for polishing. None of these infusorial earths scratch glass, 
The total amount of nitrogen contained in No. 4 was 0-491 p. c.—Jour, 
Prakt. Chem., xc, 467. G. J.B, 
11. On a cavern with human remains in the Pyrenees ; by Messrs. 
F. Garricou and L. Martiy.—The cavern which has been explored re- 
cently by Messrs. Garrigou and Martin, is one called Zspélugues, situated 
