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Crystals |
Record 151 to 175 of 215 |
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Orthoclase Crystal "Simple orthoclase crystal opened out to show the optical orientation." -Johannsen, 1908... |
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Orthoclase Twin "A Carlsbad twin of orthoclase." -Johannsen, 1908... |
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Orthoclase Twin "A Baveno twin of orthoclase." -Johannsen, 1908... |
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Plane, symmetry "A crystal has a center of symmetry if an imaginary line is passed from some point on its surface through its center, and a similar point is found on the line at an equal distance beyond the center." ... |
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Primitive Crystal "In this the four lateral planes are rectangular and equal; they may be either oblong or square; in the latter case the form is the cube." —The Encyclopedia Britannica, 1903... |
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Primitive Crystal "If the base is a square and the prism stands erect—that is, if its sides or lateral planes, as they are called, are perpendicular to the base—the form is termed a right square prism." &md... |
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Primitive Crystal "When the base is a rectangle instead of a square, the form is a right rectangular prism." —The Encyclopedia Britannica, 1903... |
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Primitive Crystal "When the base is a rhombus, and the prism stands erect, the form is a right rhombic prism." —The Encyclopedia Britannica, 1903... |
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Primitive Crystal "When the base is a rhomboid, and the prism stands erect, it is only the opposite laeral faces that can be equal. The form is called a right rhomboidal prism." —The Encyclopedia Britannica, 190... |
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Prism, orthohombie "Crystal faces are described according to their relations to the crystallographic axes. A series of numbers which indicate the relative distances by which a face intersects the different axes are cal... |
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Pyramid, orthorhombie "Crystal faces are described according to their relations to the crystallographic axes. A series of numbers which indicate the relative distances by which a face intersects the different axes are cal... |
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Pyritohedral class, symmetry of "The symmetry of the Pyritohedral class is as follows: The three crystal axes of binary symmetry; the four diagonal axes, each of which emerges in the middle of the octant, are axes of trigonal symmet... |
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Pyroxene Pyroxene... |
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Pyroxene Pyroxene... |
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Quartz "Terminated usually by a combination of a positive and negative rhombohedron, which often are so equally developed as to give the effect of a hexagonal pyramid." — Ford, 1912... |
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Quartz "Terminated usually by a combination of a positive and negative rhombohedron, which often are so equally developed as to give the effect of a hexagonal pyramid. Sometimes one rhombohedron predominate... |
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Quartz "Terminated usually by a combination of a positive and negative rhombohedron, which often are so equally developed as to give the effect of a hexagonal pyramid. Sometimes one rhombohedron predominate... |
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Quartz This illustration shows Quartz or Silica. Quarts is the most abundant mineral in the Earth's continental crust.... |
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Quartz, left-handed "The quartz crystals are said to be right or left handed, depending upon whether these faces are to be observed trunctuating the edges between prism and rhombohedron." — Ford, 1912... |
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Quartz, right-handed "The quartz crystals are said to be right or left handed, depending upon whether these faces are to be observed trunctuating the edges between prism and rhombohedron." — Ford, 1912... |
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Rhodonite Rhodonite.... |
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Rhodonite "Triclinic. Crystals commonly tabular parallel to base." — Ford, 1912... |
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Rhombic Dodecahedron The rhombic dodecahedron is a convex polyhedron with 12 rhombic faces. It is an Archimedean dual solid, or a Catalan solid. Its dual is the cuboctahedron.... |
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Rhombohedral Class, symmetry of "The vertical crystallographic axis is one of trigonal symmetry, and the three horizontal crystallographic axes of binary symmetry." — Ford, 1912... |
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Rutile Rutile.... |
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