is ded 
; 
ORIGIN AND FORMATION OF SOILS. Kia 
ANALCIME. CHABASITE. NATROLITE. SCOLECITE. THOMSONITE. 
Lake Superior. Nova Scotia. Bergen Hill, Ghaut’s Tun- Magnet 
Nid’: nel, India. Cove, Ark. 
C. T. Jackson. Rammelsberg. Brush. P. Collier. Smith & Brush 
Silica, 53.40 52.14 47.31 45.80 36.85 
Alumina, 22.40 19.14 26.77% 25.55 29.42 
Potash, —— 0.98 0.35 0.30 —_— 
Soda, 8.52 0.71 15.44 0.17 3.91 
Lime, 3.00 Gs 0.41 13.97 13.95 
Magnesia, — — —— — — 
Sesquioxide ore aes <a 155 
of iron, 
Water, 9.70 19.19 9.84 14.28 13.80 
STILBITE. APOPHYLLITE. PECTOLITE. LAUMONTITE. LEONHARDITE 
Nova Scotia. Lake Superior. Bergen Hill. Phippsburgh, Me. Lake Sup’r 
S.W. Johnson. J.L. Smith. J.D. Whitney. Dufrénoy. Barnes. 
Silica, 57.63 52.08 55.66 51.98 55.04 
Alumina, 16.17 —— 1.4 21.12 22.34 
Potash, 4.93 —- —— == 
Soda, i 55° ee 8.89 ae ao 
Lime, 8.08 25 .30 32.86 11.71 10 64 
Water, 16.07 15.92 2.96 15.05 11°93 
Calcite, or Carbonate of Lime, CaO CO,, exists in na- 
ture in immense quantities as a mineral and rock. Mar- 
ble, chalk, coral, limestone in numberless varieties, consist 
of this substance in a greater or less state of purity. 
Magnesite, or Carbonate of Magnesia, MgO CO,, oc- 
curs to a limited extent as a white massive or crystallized 
mineral, resembling carbonate of lime. 
Dolomite, CaO CO, + MgO CO,, is a compound of ecar- 
bonate of lime with carbonate of magnesia in variable 
proportions. It is found as a crystallized mineral, and is 
a very common rock, many so-called marbles and lime- 
stones consisting of or containing this mineral. 
Gypsum, or/Zydrous Sulphate of Lime, CaO SO, + H,O, 
is a mineral that is widely distributed and quite abundant 
in nature. When “boiled” to expel the water it is 
Plaster of Paris. 
Pyrites, or Bisulphide of Iron, Fe §,, a yellow shining 
mineral often found in cubic or octahedral crystals, and 
frequently mistaken for gold (hence called focl’s gold), 
