Lecture Notes on General and Special MineralogyThe author, 1903 - 683 páginas |
Otras ediciones - Ver todas
Lecture Notes on General and Special Mineralogy Frank Robertson Van Horn Sin vista previa disponible - 2015 |
Lecture Notes on General and Special Mineralogy (Classic Reprint) Frank R. van Horn Sin vista previa disponible - 2017 |
Términos y frases comunes
acid Al₂O Albite alters Amphibole angles Aragonite basal edges Biotite Brittle brown brownish Calcite called Cleavage Color white columnar common Comp compact composition conchoidal copper crystal face crystalline cube Dolomite earthy Epidote Feldspars fibrous Fluorite Fracture Galena gliding plane gneisses Granite granular gray grayish green greenish Gypsum H₂O Halite Hematite hemihedral hemimorphic Hexagonal holohedral forms igneous rocks intersect iron Isometric isomorphous K₂O lateral axes limestones Limonite Luster Luster metallic Luster vitreous Magnetite massive metamorphic metamorphic rocks Mica Mineralogy minerals Monoclinic Na₂O nearly Nepheline occurs octant opaque Orthoclase Orthorhombic parallel parameters perfect pinacoid Plagioclase planes of symmetry Pleochroism polysynthetic prism prismatic produced pseudomorphs pyramid Pyrite Pyroxene Quartz rare reddish rhombohedral schists silicates sometimes Streak uncolored Streak white striated substances Syenites symbol tabular tetartohedral Tetragonal Tourmaline translucent Transparent trapezohedral Triclinic twinning plane usually variety veins vertical axis yellow yellowish
Pasajes populares
Página 283 - The sine of the angle of incidence bears a constant ratio to the sine of the angle of refraction.
Página 87 - The sine of the middle part equals the product of the tangents of the adjacent parts. The sine of the middle part equals the product of the cosines of the opposite parts.
Página 263 - Scratches glass, though rather with difficulty, leaving its powder on it. Yields readily to the knife. 6. Scratches glass easily. Yields with difficulty to the knife. 7. Does not yield to the knife.
Página 43 - ... that time and should not be abandoned unless the evidence is clearly against it. FIG. 2. The production of an (11o) face. Some authors express the fundamental law of crystallography as the law of simple mathematical ratio. Thus Williams4 says : " Experience has shown that only those planes occur on any crystal whose axial intercepts are either infinite or small even multiples of unity.
Página 283 - It will be remembered that, according to these laws, light, in passing from a rarer to a denser medium is refracted towards the perpendicular...
Página 639 - Essentially a hydrous silicate of iron and potassium, but the material is usually a mixture and consequently varies much in composition.
Página 263 - Chapman: 1. Yields easily to the nail. 2. Yields with difficulty to the nail, or merely receives an impression from it. Does not scratch a copper coin. 3. Scratches a copper coin; but is also scratched by it, being of about the same degree of hardness. 4. Not scratched by a copper coin; does not scratch glass. 5. Scratches glass, though rather with difficulty, leaving its powder on it.
Página 357 - Oxygen-Salts. 1. Carbonates. 2. Silicates, Titanates. 3. Niobates, Tantalates. 4. Phosphates, Arsenates, Vanadates ; Antimonates. Nitrates. 5. Borates. Uranates. 6. Sulphates, Chromates, Tellurates. 7. Tungstates, Molybdates. VII. Salts of Organic Acids — Oxalates, Mellates, Etc. VIII. Hydrocarbon Compounds.
Página 263 - The hardness of a mineral is measured by the resistance which a smooth surface offers to abrasion. The degree of hardness is determined by observing the comparative ease or difficulty with which one mineral is scratched by another, or by the finger nail, or by the knife or file.
Página 609 - A transition in composition between certain end compounds has been more or less well established in certain cases, but unlike the Feldspars, with these species calcium and sodium seem to replace one another, and an increase in alkali does not go with an increase in silica.