Examples of simple forms amongst crystallized substances are octahedra of alum and spinel and cubes of salt and fluorspar.
Two misshapen or distorted octahedra are represented in figs.
Gallium crystallizes in greyish-white octahedra which melt at 30.
Octahedra and cubes are rare, but the six-faced octahedron occurs in some of the combinations.
They are dissolved by strong hydrochloric acid, and recrystallize as octahedra upon addition of ammonia.
The sublimate is generally in groups of plates drawn to a point at both ends, in crystalline needles, or in octahedra with a rectangular base.
An ethereal solution on evaporation assumes dendritic forms, but may contain octahedra and four-sided prisms.
It crystallizes in the cubical system, often in beautifuloctahedra and rhombic dodecahedra.
Peligot obtained it as minute tetragonal octahedra and cubes by reducing ferrous chloride in hydrogen.
Pyrite may be prepared artificially by gently heating ferrous sulphide with sulphur, or as brassy octahedra and cubes by slowly heating an intimate mixture of ferric oxide, sulphur and sal-ammoniac.
It forms red octahedraand is less soluble in water than the corresponding potassium compound.
It crystallizes in plates or octahedra (from benzene), which exhibit a violet fluorescence, and melt at 250 deg.
On evaporating the solution dark purple octahedra of the alum are obtained.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "octahedra" in a variety of sentences. We hope that you will now be able to make sentences using this word.
