The density and specific heat of the tetragonal form are greater than those of the yellow.
When precipitated from solutions it forms red tetragonal crystals, which, on careful heating, give a yellow rhombic form, also obtained by crystallization from the fused substance, or by sublimation.
A solid bounded by twenty-four equal and similar trapeziums; a tetragonal trisoctahedron.
A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron.
A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue.
Calcium tungstate, a mineral of a white or pale yellowish color and of thetetragonal system of crystallization.
A mineral occurring in tetragonal crystals, usually of a brown or gray color.
Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.
Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.
A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals.
A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster.
The trapezohedron or tetragonal trisoctahedron; -- so called as being the form of the mineral leucite.
A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.
By way of illustration, the tetragonal crystal of the mineral zircon, with only one axis different in length, shows the very definite axial ratio 1:1:0.
A silicate of zirconium usually crystallized in thetetragonal system as simple four-sided prisms capped by four-sided pyramids.
All tetragonaland hexagonal crystals are uniaxial.
Chalcopyrite crystallizes in the tetragonal system with inclined hemihedrism, but the form is so nearly cubic that it was not recognized as tetragonal until accurate measurements were made in 1822.
Basal ring tetragonal or nearly cordate, with a small anterior and a large posterior bow-shaped incision; on the lateral edges with numerous irregular thorns.
Meshes subregular, pentagonal, intermingled with a small number of tetragonal and hexagonal meshes.
Defn: A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals.
Defn: Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.
Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron.
Defn: Calcium tungstate, a mineral of a white or pale yellowish color and of the tetragonal system of crystallization.
Defn: Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.
Defn: The trapezohedron or tetragonal trisoctahedron; -- so called as being the form of the mineral leucite.
Defn: A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron.
Defn: A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster.
Defn: A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue.
All tetragonal and hexagonal crystals are uniaxial.
Defn: A mineral occurring in tetragonal crystals, usually of a brown or gray color.
A tetragonal or hexagonal crystal viewed, in parallel light, through the basal plane, i.
This form does not enclose space, and is therefore called an "open form" to distinguish it from a "closed form" like the tetragonal bipyramids and all the forms of the cubic system.
Weiss's four systems (crystals belonging to the cubic system being isotropic, those of the tetragonal and hexagonal being uniaxial, and the orthorhombic being biaxial).
In all crystals of the same substance this ratio is constant, and is characteristic of the substance; for other substances crystallizing in the tetragonal system it will be different.
By suppressing either one or other set of alternate faces of the tetragonal bipyramid of the first order (fig.
