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Crystals |
Record 101 to 125 of 215 |
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Cube and hexoctahedron "A combination of cube and hexoctahedron." — Ford, 1912... |
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Cube and pyritohedron "A combination of cube and pyritohedron, in which it will be noted that the faces of the pyritohedron trunctuate unsymmetrically the edges of the cube." — Ford, 1912... |
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Cube and tetrahexahedron "A cube with its edges beveled by the faces of a tetrahexahedron." — Ford, 1912... |
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Cube and trapezohedron "A combination of cube and trapezohedron." — Ford, 1912... |
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Cube, octahedron and dodecahedron A cube, octahedron, and dodecahedron.... |
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Datolite "Monoclinic. Habit varied. Crystals usually nearly equidimensional in the three axial directions and often complex in development." — Ford, 1912... |
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Diamond "Curved faces of the hexoctahedron are frequently observed." — Ford, 1912... |
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Diamond Diamond.... |
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Diamond "Pure crystalline carbon, the hardest substance known, possessing great lustre owing to its great refracting power." — Williams, 1889... |
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Diamond Cut The diamond is cut to show the stone's brilliance, creating different parts to the cut: table, crown, girdle, pavilion, culet.... |
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Diamonds, Square Cut Various types of square cut diamonds. Top row: Old square cut diamonds. Bottom row: English square cut diamonds.... |
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Diopside Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite (FeCaSi2... |
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Dodecahedron, deltoid "The faces of the deltoid dodecahedron correspond to one-half those of the trisoctahedron." — Ford, 1912... |
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Enantimorphous Crystals of Tartaric Acid "...shows two crystals of tartaric acid, a a right-handed crystal of dextro-tartaric acid, and b a left-handed crystal of laevo-tartaric acid. The two crystals are enantimorphous." -The Encyclopedia B... |
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Epidote "Monoclinic. Crystals are often much elongated parallel to the ortho-axis with a prominent development of the faces of the orthodome zone, giving them a prismatic aspect. Striated parallel to the or... |
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Extinction Angles "Positive and negative extinction angles in the feldspars." -Johannsen, 1908... |
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Garnet "Isometric. Common forms dodecahedron amd trapezohedron, often in combination." — Ford, 1912... |
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Garnet "Isometric. Common forms dodecahedron amd trapezohedron, often in combination." — Ford, 1912... |
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Garnet "Isometric. Common forms dodecahedron amd trapezohedron, often in combination. Hexoctahedron observed at some times." — Ford, 1912... |
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Gnomonic projection of a cubic crystal "Here the plane of projection is tangent to the sphere, and normals to all the faces are drawn fro mthe centre of the sphere to intersect the plane of projection." -The Encyclopedia Britannica 1910... |
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Gypsum Gypsum.... |
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Gypsum Gypsum.... |
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Gypsum "Monoclinic. Crystals usually tabular parallel to clinopinacoid; in diamond-shaped crystals with edges beveled by prism and pyramid faces." — Ford, 1912... |
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Gypsum "Monoclinic. Crystals usually tabular parallel to clinopinacoid; in diamond-shaped crystals with edges beveled by prism and pyramid faces. Other forms rare. Sometimes twinned." — Ford, 1912... |
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Hematite "Hexagonal-rhombohedral. Crystals usually thick to thin tabular. Basal planes prominent, often showing triangular markings." — Ford, 1912... |
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