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Figure 3 Coordination environment of Ca, Na, As and O atoms, with displacement ellipsoids drawn at the 50% probability level (symmetry codes: (i) −0.5+x, 0.5-y, 0.5-z; (ii) −0.5+x, 0.5-y, 1.5-z; (iii) −0.5+x, y, 1.5-z; (iv) 1-x, 0.5+y, 1-z; (v) 1-x, −y, 1-z; (vi) 1-x,0.5+y, −z; (vii) x, y, −1+z; (viii) x, 0.5-y,-1+z; (ix) 1-x, −0.5+y, −z; (x) 0.5+x, 0.5-y, 0.5-z; (xi) 1-x, −0.5+y, 1-z; (xii) 0.5+x, 0.5-y, 1.5-z; (xiii) x, 0.5-y, z; (xiv) x, y, z+1). |