KIO 4 forms tetragonal crystals of the Scheelite type ( space group " I " 4 1 / a ).
12.
If the piezoelectric tensor is considered to be that of the tetragonal crystal system ( that of BaTiO 3 ) then it is
13.
These ? phase precipitates are ordered A 3 B type with a composition of Ni 3 ( Nb, Al, Ti ) and a tetragonal crystal structure.
14.
Tugtupite occurs as vitreous, transparent to translucent masses of tetragonal crystals and is commonly found in white, pink, to crimson, and even blue and green.
15.
While it is similar in density ( 1.29 g / cm 3 at ) to ice IV ( also found in the ice V space ) it exists as a tetragonal crystal.
16.
As a result of its tetragonal crystal structure, this material has negative uniaxial optical symmetry with typical refractive indices 1.522 } } and 1.478 } } at optical wavelengths.
17.
The mineral has tetragonal crystal symmetry and the same structure as scheelite ( calcium tungstate, CaWO 4 ), but can be metamict ( amorphous ) due to radiation damage from its small content of thorium.
18.
File : Surface of a kidney stone . jpg | SEM image of the surface of a kidney stone showing tetragonal crystals of Weddellite ( calcium oxalate dihydrate ) emerging from the amorphous central part of the stone.
19.
"' Ice IX "'is a form of solid water stable at temperatures below 140 K and pressures between 200 and 400 MPa . It has a tetragonal crystal lattice and a density of 1.16 g / cm? 26 % higher than ordinary ice.
20.
"' Braggite "'is a sulfide mineral of platinum, palladium and nickel with chemical formula : ( Pt, Pd, Ni ) S . It is a dense ( specific gravity of 10 ), steel grey, opaque mineral which crystallizes in the tetragonal crystal system.
