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Crystals |
Record 76 to 100 of 215 |
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Chalcocite "Orthorhombic. Usually in small tabular crystals with hexagonal outline. Striated parallel to the brachy-axis. Often twinned in pseudohexagonal forms." — Ford, 1912... |
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Clinographic drawing of a cubic crystal "A drawing of a crystal showing a combination of the cube, octahedron and rhombic dodecahedron is shown, in which the faces are lettered the same as the corresponding poles in the projection." -The En... |
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Columbite "Orthohombic. Habit of crystals is short prismatic; often in square prisms because of prominent development of the vertical pinacoids. Terminated by basal plane, pyramids and domes; frequently compl... |
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Corundum Corundum.... |
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Corundum Corundum.... |
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Corundum "Hexagonal-rhombohedral. Crystals usually prismatic in habit or tapering hexagonal pyramids." — Ford, 1912... |
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Corundum "Hexagonal-rhombohedral. Crystals usually prismatic in habit or tapering hexagonal pyramids." — Ford, 1912... |
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Crystal of Augite "...represents a crystal of augite bounded by th clino-pinacoid, the ortho-pinacoid, a prism, and a hemi-pyramid." -The Encyclopedia Britannica 1910... |
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Crystal of Axinite "Here there is only a [center] of symmetry. All the forms are pina-coids, each consisting of only two paarallel faces." -The Encyclopedia Britannica 1910... |
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Crystal of Chalcopyrite "...a combination of two bisphenoids (P and P'), two bipyramids of the second order (b and c), and the basal pinacoid (a)." -The Encyclopedia Britannica 1910... |
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Crystal of Dioptase "...represents a crystal of dioptase with the fundamental rhombohedron (r) and the hexagonal prism of the second order (m) combined with the rhombohedron (s)." -The Encyclopedia Britannica 1910... |
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Crystal of Fergusonite "...a combination of tetragonal prism of the first order with a tetragonal bipyramid of the third order and the basal pinacoid." -The Encyclopedia Britannica 1910... |
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Crystal of Hemmorphite "...a combination of the brachy-pinacoid and a prism, with the pedion, two brachy-domes and two marco-domes at the upper end, and a pyramid at the lower end." -The Encyclopedia Britannica 1910... |
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Crystal of Hypersthene Holohedral orthorhombic combination... |
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Crystal of Tourmaline "...represents a crystal of tourmaline wit the trigonal prism, hexagonal prism, and a trigonal pyramid at each end." -The Encyclopedia Britannica 1910 ... |
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Crystal of Zircon (actual) "...shows the actual shape of a crystal of ziron from Ceylon" -The Encyclopedia Britannica 1910... |
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Crystal of Zircon (ideal) "...the ideally developed form [of a zircon crystal]. The crystal is a combination of five simple forms: two tetragonal prisms, two tetragonal bipyramids, and one ditetragonal bipyramid." -The Encycl... |
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Crystal, beryl A beryl crystal, an example of a basal pinacoid.... |
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Crystal, beryl A beryl crystal, an example of a basal pinacoid.... |
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Crystal, beryl A beryl crystal, an example of a basal pinacoid.... |
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Crystal, beryl A beryl crystal, an example of a basal pinacoid.... |
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Crystal, sulphur "The forms present upon it are two pyramids of different slope but each intersecting all three of the crystal axes when properly extended. The lower pyramid intersects the two horizontal axes at dist... |
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Crystallographic axes of reference "...take any three edges formed by the intersection of three faces of a crystal. These axes are called the crystallographic axes, and the planes in which they lie are the axial planes. A fourth face o... |
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Crystals, Forms of Forms of crystals.... |
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Cube and dodecahedron "A combination of dodecahedron and cube." — Ford, 1912... |
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