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Crystals |
Record 176 to 200 of 215 |
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Rutile "Tetragonal. Usually prismatic with pyramid terminations." — Ford, 1912... |
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Scapolite "A crystal of scapolite, upon which the faces of the third-order pyramid are shown." — Ford, 1912... |
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Scheelite "Tetragonal; tri-pyramidal. Crystals usually simple pyramids of first order. Closely resemble isometric octahedrons in angles. Faces of the pyramid of third order are small and rare." — Ford,... |
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Simple Crystal of Gypsum "...to be cut in half by this plane (the twinned plane, reference Twinned Crystal of Gypsum) and one portion to be rotated through 180 degrees about the normal to the same plane. Described as being tw... |
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Sphalerite "Isometric; tetrahedral. Tetrahedron form." — Ford, 1912... |
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Sphenoidal class, symmetry of "The Sphenoidal Class corresponds in the Tetragonal system to the Tetrahedral class in the Isometric System. It is characterized by the following symmetry: The three crystallographic axes are axes of... |
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Staurolite Staurolite.... |
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Staurolite "Orthohombic. Habit prismatic, showing usually a combination of prism with large angle, brachypinacoid, base and macrodome." — Ford, 1912... |
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Stereographic Projection of a Holosymmetric Rhombohedral Crystal "...in this figure the thicker lines are the projections of the three planes of symmetry, and on these lie the poles of the rhombehedra (six of which are indicated)." -The Encyclopedia Britannica 191... |
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Sulphur Sulphur.... |
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Sulphur Sulphur.... |
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Sulphur "Resinous luster. Color sulphur-yellow, varying with impurities to yellow shades of green, gray, and red. Transparent to opaque. Imperfect conductor of heat." — Ford, 1912... |
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Sulphur "Resinous luster. Color sulphur-yellow, varying with impurities to yellow shades of green, gray, and red. Transparent to opaque. Imperfect conductor of heat." — Ford, 1912... |
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Tetrahedral class, symmetry of "The symmetry of this class is as follows: The three crystallographic axes are axes of binary symmetry; the four diagonal axes are axes of trigonal symmetry; there are six diagonal planes of symmetry.... |
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Titanite "Monoclinic. Crystals varied in habit. Often with prominent basal plane which is steeply inclined and which in combination with short prism and pyramid faces gives a thin wedge-shaped crystal." &mda... |
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Titanite "Monoclinic. Crystals varied in habit. Often with prominent basal plane which is steeply inclined and which in combination with short prism and pyramid faces gives a thin wedge-shaped crystal." &mda... |
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Topaz Topaz.... |
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Topaz Topaz.... |
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Topaz Topaz... |
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Topaz "Orthohombic. In prismatic crystals terminated by pyramids, domes, and basal plane." — Ford, 1912... |
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Tourmaline "Tourmaline crystals show the forms of the Rhombohedral Class but with hemispherical development. They are also commonly characterized by the presence of three faces of a triangular prism." — F... |
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Tourmaline "Tourmaline crystals show the forms of the Rhombohedral Class but with hemispherical development. They are also commonly characterized by the presence of three faces of a triangular prism." — F... |
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Tourmaline "Tourmaline crystals show the forms of the Rhombohedral Class but with hemispherical development. They are also commonly characterized by the presence of three faces of a triangular prism." — F... |
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Tourmaline "Hexagonal-rhombohedral; hemimorphic. Crystals usually prismatic, vertically striated. A triangular prism, with three faces, prominent, which with the tendency of the prism faces to be vertically st... |
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Tourmaline "Hexagonal-rhombohedral; hemimorphic. Crystals usually prismatic, vertically striated. A triangular prism, with three faces, prominent, which with the tendency of the prism faces to be vertically st... |
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