MINERALS AND GEOLOGY OF CANADA. 163 
(B. 3, and D. 4.) Molybdenite, (B. 2.) Magnetic Pyrites, (B. 3.) 
Tron Pyrites, (4. 1.) Arsenical Pyrites, (4. 3.) 
3. Oxides of Iron, Manganese, &e. 
Specular or Red Iron Ore, (44, and D 3.) Ilmenite (A 4.) 
Brown Iron Ore (A 4, and D3.) Magnetic Iron Ore (4 4, and C 1.) 
Iserine (4 4.) Chromic Iron Ore (A 4, and C1.) Earthy Man- 
ganese Ore (D 3.) Uran Ochre (D 3.) 
4, Alumina and Aluminates. 
Corundum (C 1.) Spinel (C' 1.) 
5. Silica and Silicates*. 
Quartz (C1.) Zircon (C'1.) Andalusite(C'1.) Cyanite (€ 1.) 
Staurolite (C 1.) Garnet (C 3.) Idocrase (C 3.) Epidote (C 3.) 
Mica(D4.) Tourmaline(C3.) Chondrodite(C2.) Olivine (€ 2.) 
Hornblende, Actynolite, Tremolite (C 3.) Augite, Diopside, 
Asbestus (C 3, and D4.) Hypersthene, Bronzite(C'3.) Diallage 
(C3, and D5.) Wollastonite or Tabular Spar (C' 3.) Tale (D 5.) 
[Renselaerite (D 5.)] Serpentine (D 5.) Chlorite(D5.) [Loga- 
nite (D 5.)] Orthoclase or Potash Feldspar (C 3.) [Pholerite, 
Kaolin (D5.)] Albite (C 3.) Labradorite (C 3.) Scapolite or 
Wernerite (C 3.) Prehnite (C 4.) Datolite (C 4.) Thomsonite 
(C 4.) Analeime (C 4.) Apophyllite (C 4.) 
6. Titanic acid and Titaniates. 
Rutile (C 1.) Sphene (C3): usually regarded as a silico-titani- 
ate of lime, but its true atomic constitution is still uncertain. 
7. Carbonates. 
Calcite or Cale Spar (D 4.) Dolomite (D 4.) Magnesite (D 4.) 
Arragonite (D 4.) Malachite and Blue Carbonate of Copper (D 3.) 
8. Sulphates. 
Barytine or Heavy Spar (D 4.) Celestine or Sulphate of Strontia 
(D 4.) Gypsum (D 5.) Epsom Salt (D 1.) 
* Keeping in view the popular and explanatory character of this Essay, it may not be 
inappropriate to observe that the term “Silicate ” signifies a combination of silica or 
silicic acid with one or more oxidized bases, such as a lime, magnesia, oxide of iron, alumina, 
&c. In like manner (to cite a few more examples of this nomenclature,) a “carbonate” is 
a combination of carbonic aecid,—a “ phosphate,” of phosphoric acid,—a “sulphate,” of 
sulphuric acid—with one or severa! of these oxides. Thus, Gypsum, consisting of sulphuric 
acid, lime, and water, is a hydrous sulphate of lime. The term “ sulphide,” or “sulphuret 
on the other hand, denotes a compound of sulphur with some simple substance, as lead, 
copper, iron, &¢., or with several of these. 
