Crystal Structure of Lamprophyllite

The crystal structure of orthoericssonite.

“…The bridge bonds of the silicate group have a length of 1.639(2)A and they are significantly longer than non-bridge bonds ( Table 2). The distances between FeH and oxygens bonded to Si are similar to each other 1.989(6)A; Fe-0(5) 1.995(6)A] and are much longer than the apical bond, Fe-0 (6) 1.834 (6) such a coordination is rather common for the cations like Ti and V as has been found in lamprophyllite (Woodrow, 1964), yoshimuraite (Takeuchi and Haga;, 1978 and haradaite (Takeuchi and Joswig, 1967).…”

“…The crystal structure of orthoericssonite is very similar to that of lamprophyllite, (Sr, Ba, K)(Na, TiMTiO)[Si"O,J(OH), determined with the projection along the z-axis by Woodrow (1964). Moore (1971) has already discussed the structural relationship between orthoericssonite and ericssonite to be very close to that between orthorhombic lamprophyllite and lam pro phyllite, and also suggested that ericssonite was isotypic with lamprophyllite.…”

“…Woodrow (1964), however, used the name lamprophyllite for monoclinic barium-dominant "lamprophyllite". Peng and Chang (1965) referred to the minerals of lam pro phyllite group, using the name lamprophyllite and barytolamprophyllite for monoclinic lamprophyllite and its barium-dominant one, respectively.…”

“…The structure of lamprophyllite (Woodrow, 1964) then served for allocating initial positions of silicon and oxygen atoms in the orthoericssonite structure. The structure thus derived was refined with the least-squares program LIl\lJS (Coppens and Hamilton, 1970); the isotropic refinement converged to give the value of R=0.063.…”

From structure topology to chemical composition. VI. Titanium silicates: the crystal structure and crystal chemistry of bornemanite, a group III Ti-disilicate mineral

“…Krivovichev et al (2003);Rastsvetaeva and Dorfman (1995);Rastsvetaeva et al (1990);Saf'yanov et al (1983);Woodrow (1964);(2)Rastsvetaeva and Chukanov (1999); (3) Sokolova and Hawthorne (2008b); (4) Sokolova and Cámara (2008); Rastsvetaeva et al (1995); Peng et al (1984); (5) Chernov et al (1971); (6) Sokolova and Hawthorne (2004); (7) Ercit et al (1998); Drozdov et al (1974); (8) this work.The latest reference on the structure is the first entry in the numbered list of references.…”