34 Ideal beta-Cristobalite (SiO_2) & Fd(-3)m (#227, O^7_h) & cF24 & C9 & Wyckoff, Vol. I, pp. 318-19, Pearson's Handbook Vol. IV, p. 4759 Si 8.06175000 .89575000 .89575000 O 7.16600000 1.79150000 1.79150000 Si .89575000 .89575000 .89575000 Si 4.47875000 4.47875000 .89575000 O 3.58300000 5.37450000 1.79150000 O 5.37450000 3.58300000 1.79150000 Si 8.06175000 8.06175000 .89575000 Si 4.47875000 .89575000 4.47875000 O 3.58300000 1.79150000 5.37450000 O 5.37450000 1.79150000 3.58300000 Si 8.06175000 4.47875000 4.47875000 Si 6.27025000 2.68725000 2.68725000 O 7.16600000 3.58300000 3.58300000 O 7.16600000 5.37450000 5.37450000 Si 8.06175000 .89575000 8.06175000 Si .89575000 8.06175000 .89575000 O 1.79150000 7.16600000 1.79150000 Si .89575000 4.47875000 4.47875000 O 1.79150000 3.58300000 5.37450000 O 1.79150000 5.37450000 3.58300000 Si 4.47875000 8.06175000 4.47875000 Si 2.68725000 6.27025000 2.68725000 O 3.58300000 7.16600000 3.58300000 O 5.37450000 7.16600000 5.37450000 Si .89575000 .89575000 8.06175000 O 1.79150000 1.79150000 7.16600000 Si 4.47875000 4.47875000 8.06175000 Si 2.68725000 2.68725000 6.27025000 O 3.58300000 3.58300000 7.16600000 O 5.37450000 5.37450000 7.16600000 Si 8.06175000 8.06175000 8.06175000 Si 6.27025000 6.27025000 6.27025000 O 7.16600000 7.16600000 7.16600000 Si .89575000 8.06175000 8.06175000 **************************************** Primitive vectors a(1) = .00000000 3.58300000 3.58300000 a(2) = 3.58300000 .00000000 3.58300000 a(3) = 3.58300000 3.58300000 .00000000 Volume = 91.99631257 Reciprocal vectors b(1) = -.13954786 .13954786 .13954786 b(2) = .13954786 -.13954786 .13954786 b(3) = .13954786 .13954786 -.13954786 Basis Vectors: Atom Lattice Coordinates Cartesian Coordinates Si .12500000 .12500000 .12500000 .89575000 .89575000 .89575000 Si -.12500000 -.12500000 -.12500000 -.89575000 -.89575000 -.89575000 O .00000000 .00000000 .00000000 .00000000 .00000000 .00000000 O .50000000 .00000000 .00000000 .00000000 1.79150000 1.79150000 O .00000000 .50000000 .00000000 1.79150000 .00000000 1.79150000 O .00000000 .00000000 .50000000 1.79150000 1.79150000 .00000000