  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Plate 5Gold in quartz, from California Plate 6Native silver in calcite Argentite, the black masses throughout the white quartz Plate 7Pyrargyrite as it appears after moderate exposure to the light. Crystal form of Pyrargyrite Prousite as it appears after moderate exposure to the light Plate 8Native copper from Michigan Chalcopyrite in tetrahedrons and an occasional octahedron. Plate 9Chalcocite crystals with the bluish tarnish Tetrahedrite crystals Plate 11Cuprite, the red crystals showing characteristic color, other showing the green tarnish of malachite Malachite (green) and azurite (blue), the two minerals shown together as they very commonly occur Plate 12Limonite The crystal form in which goethite is found, p is the prism faces, b and c are faces formed by beveling the edges of the prism, o is the pyramidal face characteristic of the ends Plate 13Hematite, Clinton iron ore, oolitic Siderite crystals Plate 15Pyrite crystals Marcasite in concretionary form with radiate structure Plate 17Galena in crystals Pyromorphite crystals (green) Plate 19Sphalerite, some the normal yellow and some crystals with the reddish tinge. (White is dolomite) Zincite Plate 21Smithsonite in yellow crystals Franklinite in octahedral crystals Plate 24Arsenopyrite, showing crystals massed so as to be incompletely developed Realgar as it usually occurs in powdery incrustations Plate 25Large crystal of stibnite, the light colored face is the one parallel to which cleavage occurs Niccolite as a vein in slate Plate 26Cobaltite, silver color, with pink tinge Smaltite, pink is cobalt bloom Plate 27Carnotite from southwest Colorado Cinnabar Plate 31Amethyst, not however deep enough colored for gems Jasper, with botryoidal surface Plate 32Banded Agate from Brazil Plate 33Common Opal from Arizona Siliceous sinter or Geyserite from The Yellowstone Park Plate 35A group of Microcline crystals from Pike’s Peak, Colo. Labradorite, showing multiple twinning (the striation), and the iridescent play of colors Plate 36Crystal form of a pyroxene; a and b prism faces, m the beveled edge between two prism faces Cross section of a pyroxene crystal showing the lines of intersection of the two cleavage planes Cross sections of pyroxenes, showing typical forms taken by crystals Augite crystals, in crystalline limestone Plate 38The dodecahedron and the 24-sided figure characteristic of garnets The garnet, grossularite The garnet alamandite Plate 39Beryl of gem quality Zircon in syenite Plate 40Cyanite crystals in schist A crystal of mica, showing basal cleavage Plate 41Crystal form typical of topaz A topaz crystal from Brazil Crystal form typical of staurolite when simple A typical twin of staurolite Plate 43Serpentine Chlorite Plate 49Apatite crystals in crystalline calcite The ends of apatite crystals showing common modes of termination Plate 50A group of fluorite crystals A group of halite crystals Plate 61Amber Two bottles of petroleum, the left hand one with a paraffin base, the right hand one with an asphalt base Plate 65Mica schist, with garnets Chlorite schist Plate 67Serpentine, composed of serpentine, hematite, and some calcite Plate 1Basal forms of the isometric systemCube Octahedron Dodecahedron Plate 2Basal forms of the tetragonal systemA square prism Octahedron Basal forms of the orthorhombic systemA Rectangular prism Octahedron Plate 3Basal forms of the monoclinic systemThe rectangular prism askew The octahedron A cross section of the prism with its edges beveled so that the b faces are obliterated by the m faces, and a six-sided prism is formed (pseudo-hexagonal) Basal form of the triclinic system Plate 4Basal forms of the hexagonal systemThe six-sided prism The double pyramid The rhombohedron Plate 10Tetrahedrons showing characteristic manner in which tetrahedrite occurs A cube with the edges beveled and the corners cut in a form characteristic of cuprite Plate 30Two intergrowing or twinned quartz crystals Diagram of the typical quartz crystal, p prism faces, l left hand rhombohedron, r right hand rhombohedron A quartz crystal on which the left hand rhombohedron is represented by small faces while the right hand rhombohedron has large faces Plate 14Crystal forms of hematite, A the rhombohedron with the edges beveled; B the tabular form, resulting from the excessive development of the two o faces opposite each other A typical crystal of magnetite The rhombohedron typical of siderite Plate 16The pyritohedron The pyritohedron with certain of its edges beveled by the cube faces, to show the relationship of these two forms Plate 18Typical forms for cerrusiteThe pyramid, n the prism face, m the beveled prism, p the octahedral face, and o the edge of the octahedral faces beveled The simple type of twinning A multiple twin where three crystals grow through each other Forms in which anglesite occurs: l the pyramid face, p the prism face, o the vertical edge of the prism beveled, m the horizontal edge of the prism beveled, n a further beveling of the horizontal edge of the prism. D the tabular, E the prismatic form Plate 20A characteristic form in which sphalerite may occur; being the combination of, d the dodecahedron, o the octahedron, and t, a 24-sided figure Characteristic form for zincite crystals, n the hexagonal prism, and p pyramidal faces on it Typical form of crystal of willemite: p the prism, r rhombohedron faces on end, ½ r a second lower rhombohedron Plate 22Moss agates, showing the dendritic growth of manganitic minerals, like manganite or pyrolusite Moss agates Crystal form of manganite Plate 23Crystals of green corundum in syenite, from Montana Typical crystal forms of corundum: A the elongated prism with the alternate corners cut by rhombohedral faces, B the tabular prism, C the double pyramid Plate 28Cassiterite, twinned crystals The crystal form in which both cassiterite and rutile occur when in simple crystals, p prism faces, m beveling of the prism, o octahedral face, n beveling of the edge between octahedral faces Multiple twinning characteristic of rutile Plate 29Crystal of Spinel Crystal forms in which dolomite occursA the cleavage form, rhombohedron with the faces curved B the rhombohedron with the corners cut, as it often occurs C the form found in gypsum or anhydrite Plate 34Orthoclase, a cleavage piece, a and b the perfect cleavage planes, and c the imperfect cleavage plane Crystal forms of orthoclaseA the simple crystal B the twinned form C the twinned form in which the crystals are intergrowing Diagram of a multiple twin of a plagioclase feldspar Plate 37Diagrams of amphibole crystalsA a typical crystal B cross section showing the intersection of cleavage planes C and D cross sections to show variations in outline Tremolite in silky fibrous crystals. Asbestos Hornblende crystals in quartzite Plate 42Epidote crystals Typical forms of epidote crystals; p prism faces, m, n, x, and y beveled edges of the prism, o octahedral faces Typical forms of tourmalineA side view; B and C ends to show terminations; p prism faces, m beveling of prism edges, r a low rhombohedron on the end, s the opposite rhombohedron, b basal face, and the other faces represent bevelings Plate 48A group of barite crystals Outline of the typical tabular barite crystal The six-sided double pyramid, composed of three interpenetrating crystals, typical of witherite and strontianite Plate 44The typical form of analcite A typical natrolite crystal The typical crystal form of stilbite A sheaf-like bundle of fibrous crystals, typical of stilbite Plate 45A group of calcite crystals Typical forms of calciteA the rhombohedron formed by cleavage B a rhombohedral crystal truncated by the basal plane C the scalenohedron D the scalenohedron truncated by the rhombohedron E the scalenohedron on a prism Plate 46Typical forms of aragoniteA the simple crystal B a needle-like form, twinned C cross section to show how the form may appear six-sided Typical form of the anhydrite crystal Plate 47A piece of gypsum looking on the surface of the perfect cleavage, and showing the two other cleavages as lines, intersecting at 66°. Twinning is also shown A simple crystal of gypsum Twin crystals of gypsum Plate 51Sulphur crystals Ice crystals, the top one, the end of a hexagonal prism; the two lower figures multiple twins as in snow flakes Plate 52The Devil’s Tower, Wyoming, an example of igneous rock with columnar structure, and resting on sedimentary rocks. Courtesy of the U. S. Geological Survey Plate 53A coarse granite Graphic granite Plate 54Syenite Gabbro Plate 55Basalt-porphyry. The large white crystals are phenocrysts of plagioclase feldspar Basalt-obsidian Plate 56Amgydoloid Plate 57The north face of Scott’s Bluff, Neb., showing sedimentary sandstones above and clays below. The type of erosion is characteristic of arid regions. Courtesy of the U. S. Geological Survey Plate 58Breccia Conglomerate Plate 59Calcareous shale Coquina Plate 60Foramenifera from Chalk; enlarged about 25 diameters Encrinal Limestone; fragments of the stems, arms and body of Crinoids Plate 62A diatomaceous earth magnified 50 times B and C two diatoms from the above enlarged 250 times. After Gravelle, by the courtesy of Natural History Plate 63A metamorphic rock, showing the contortion of layers due to expansion under heat Plate 64A conglomerate partly metamorphosed to a gneiss. Note the flattened pebbles and the alternation of the intermediate material to mica scales, etc. A typical gneiss Plate 66Phyllite A white marble, with black streaks due to graphite Plate 68Claystones, simple and compound A line concretion, which on splitting disclosed a fern leaf of the age of the coal measures Plate 69A septeria from Seneca Lake, N. Y. Pisolite Plate 70A geode filled with quartz crystals Plate 71A quartz pebble from the bed of a New England brook A pebble of schist and granite from the foot of Mt. Toby, Mass. Plate 72An iron-nickel meteorite, of 23 lbs. which fell in Claiborne Co., Tenn. An etched slice of an iron meteorite which fell in Reed City, Osceola Co., Mich. Plate 73A stony meteorite, about natural size, which fell in 1875, in Iowa Co., Iowa PUTNAM’S |
| Mathews | American Wild Flowers |
| American Trees and Shrubs | |
| Wild Birds and Their Music | |
| Durand | Wild Flowers in Homes and Gardens |
| My Wild Flower Garden | |
| Common Ferns | |
| Lutz | Insects |
| Loomis | Rocks and Minerals |
| Eliot | Birds of the Pacific Coast |
| Armstrong | Western Wild Flowers |
| Alexander | Birds of the Ocean |
| Anthony | North American Mammals |
| Thomas | Common Mushrooms |
| Sturgis | Birds of the Panama Canal Zone |
| Miner | Seashore Life |
| Breder | Marine Fishes of the Atlantic Coast |
| Morgan | Ponds and Streams |
| Longyear | Rocky Mountain Trees and Shrubs |
| Olcott Putnam | Field Book of the Skies |
| Beebe Tee-Van | The Shore Fishes of Bermuda |
| Schrenkeisen | Fresh-Water Fishes of North America North of Mexico |
