 | | Book | | Brazil; hematite, Elba; cassiterite, Bolivia; garnet, North Carolina; quartz, Brazil; right row: liquated...Chapter 13. These may be precious metals, including gold, silver, and Our World of Minerals 7 platinum;...metallic. The mineral fuels belong to the second group of economic mineral products. Besides iron and copper...viewed with alarm by thoughtful observers. The third group of commercial minerals comprises the nonmetallic...that is present. The industrial minerals of this group cover a diverse list of applications. Structural |  | | Book | | Brazil; hematite, Elba; cassiterite, Bolivia; garnet, North Carolina; quartz, Brazil; right row: liquated...Chapter 13. These may be precious metals, including gold, silver, and platinum; or base metals, such as copper...metallic. The mineral fuels belong to the second group of economic mineral products. Besidesiron and copper...viewed with alarm by thoughtful observers. The third group of commercial minerals comprises the non-metallic...that is present. The industrial minerals of this group cover a diverse list of applications. Structural |  | | Report (issue) | | doubtful or discredited species) NATIVE ELEMENTS Gold Silver Copper Iron Bismuth Selenium Tetradymite...[Bulletin 18 SILICATES - Tektosilicates Feldspar Group (Orthoclase) (Microcline) (Anorthoclase) (Albite)...(Clinochlore) Stilpnomelane Chloritoid Pyroxene Group (Enstatite) (Hypersthene) (Diopside) (Hedenbergite)...Cordierite - Sorosilicates Hemimorphite Amphibole Group (Cummingtonite) (Grunerite) (Tremolite) (Actinolite)...(Arfvedsonite) (Barkevikite) INTRODUCTION 1965] Garnet Group (Almandite) (Andradite) (Grossu.larite) (Pyrope) |  | | Report (volume) | | and abridgment of the literature from 1858, when gold was discovered, through 1957 (with a few additions...important source material from the earliest reports of gold discoveries in 1858, through 1958. Compilation and...billion worth, came from 1ninerals. F·xcept for native gold and the rock-forming minerals that comprise construction...·i nerals Approximate value Gold : (millions of dollars) Native gold------------------------------...25 5 88 260 50 5 2 317 1 The distribution of gold and silver in auriferous and argentiferous sulfides |  | | Book (edition) | | 1. 2. 3. 4. II. Sulphur Group Boron Group Arsenic Group Carbon Group 104 106 109 110 115 MINERALS...WITH OR WITHOUT ACIDIC THE SILICATES EXCLUDED. Gold 122 and Compounds Platinum, Iridium, Ruthenium...Amphibole Group 274 275 277 278 Beryl, etc 2. Unisilicates Chrysolite Group Garnet Group Zircon Group...Axinite 282 Danburite, lolite 286 Mica Group Scapolite Group 287 292 293 286 Nephelite, Sodalite,... Leucite 296 302 303 304 306 Feldspar Group 8. Subsilicates Chondrodite Tourmaline Andalusite, Fibrolite |  | | Book (edition) | | mark the degree of symmetry which belongs to each group of forms, and which is in fact the fundamental distinction...study of these different systems will show that in group 1 1. : ; : A the crystals are formed or developed...developed alike in all three axial directions; in group 2 the development is alike in the several lateral...lateral directions, but unlike vertically ; and in group 3 the crystals are formed unlike in all three These...species. In f 229, of anorthite, of the feldspar group, the form is very similar to those of the monoclinic |  | | Book (edition) | | College. and Synonyms. 8vo, cloth, — — COMSTOCK LODE; ITS FORMATION AND HIS- TORY. CHURCH. Illustrated...that in group 1 the crystals are formed or developed alike in all three axial directions; in group 2 the...species. In f. 229, of anorthite, of the feldspar group, the form is very similar to those of the monoclinic...plane O will meet the sphei-e of projection at the central point (f. 239) the planes i-l at the points indicated...example, live-fold twins occur in the tetrahedrons of gold and sphalerite, since 5 x 70° 32' (the tetra360° |  | | Book (edition) | | mark the degree of symmetry which belongs to each group of forms, and which is in fact the fundamental distinction...that in group 1 the crystals are formed or developed alike in all three axial directions ; in group 2 the...in the several lateral directions, but unand in group 3 the crystals are formed unlike in all three like...species. In f 229, of anorthite, of the feldspar group, the form is very similar to those of the monoclinic...plane O will meet the sphere of projection at the central point (f. 239) ; the planes i-l at the points |
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