Noun:

द्वादशफ़लक,

dodecahedra's Usage Examples:

The "small stellated dodecahedron," the "great dodecahedron" and the "great stellated dodecahedron" are Kepler-Poinsot solids; and the "truncated" and "snub dodecahedra" are Archimedean solids (see Polyhedron).

Titanium is often present, and occasionally the mineral contains magnesium, nickel, 'c. It is always strongly magnetic. Magnetite crystallizes in the cubic system, usually in octahedra, less commonly in rhombic dodecahedra, and not infrequently in twins of the " spinel type " (fig.

tessellated structure may arise from water dodecahedra separated by only one pentagonal box (shown below ).

The fracture is distinctly crystalline; large crystals, either regular dodecahedra or octahedra, may be obtained by crystallization from carbon bisulphide, sulphur chloride, 'c., or by sublimation.

Many other dodecahedra exist as crystal forms, for which see Crystallography.

The felspathoid minerals, sodalite, haiiyne and nosean, which crystallize in isometric dodecahedra, are very frequent components of the phonolites; their crystals are often corroded or partly dissolved and their outlines may then be very irregular.

It crystallizes in the cubic system, usually in cubes, pentagonal dodecahedra or octahedra, often of great beauty and perfection.

It crystallizes in the cubical system, often in beautiful octahedra and rhombic dodecahedra.

4 illustrates a characteristic twin, formed by two interpenetrating pentagonal dodecahedra.

Lead monoxide is dimorphous, occurring as cubical dodecahedra and as rhombic octahedra.