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pseudotetragonal
pseudotetragonal adj. 
/ˌs(j)uːdə(ʊ)tᵻˈtraɡ(ə)nl/,
Brit. /ˌs(j)uːdə(ʊ)tɛˈtraɡ(ə)nl/
, /ˌs(j)uːdə(ʊ)tɛˈtraɡ(ə)nl//ˌs(j)uːdə(ʊ)tᵻˈtraɡ(ə)nl/U.S. /ˌsudoʊˌtɛˈtræɡən(ə)l/
Crystallography of, relating to, or designating a crystal in which the crystal structure simulates the symmetry of the tetragonal system but actually has lower symmetry./ˌsudoʊˌtɛˈtræɡən(ə)l/ΚΠ
1882 Amer. Naturalist 16 422 Among pseudo-tetragonal crystals may be mentioned apophyllite, idocrase and zircon, now shown to be assemblages of monoclinic crystals.
1968 I. Kostov Mineral. ii. vii. 467 Ekdemite is tetragonal, dimorphous with heliophyllite which is orthorhombic pseudotetragonal.
1984 N. N. Greenwood & A. Earnshaw Chem. of Elements (1986) vii. 252 Gallium has a unique orthorhombic (pseudotetragonal) structure in which each Ga has 1 very close neighbour at 244 pm and 6 further neighbours, 2 each at 270, 273 and 279 pm.
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