Arago nit e (C aCO ,,) c ry s ta lli zes in th e unit ce ll a = 4.9598(5) /\ . 6 = 7.9641(9) A, and c = 5.7379(6) A at 25 C with four form ula we ight s in s pace-g roup Pm cn. Th e s tru cture has bee n re fin ed to N".= 0.024 . N = 0.040 using 765 x-ray re Aec tion s fro m a sin gJe c rysta l. Th e Ca ion is coo rdinat ed to nin e oxygens with Ca .. . di s tan ces III th e range 2.414(2) A to 2.653(1) A. Th e t wo un iqu e C -O di s ta nces in th e CO" group a re 1.288(2) ;\ (o n th e mirror plan e) a nd 1. 283(1) A. T he two un iqu e O-C-o a ngles are 119.6( Th e d is tan ces a nd an gles in th e CO" "ro up are not signifi ca ntl y d iffe re nt a t th e 95 pe rce nt co nfid e nce leve l. "
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Dickens et al. (1971) studied this question.
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