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Hydroxylclinohumite Mg 9 [SiO 4 ] 4 (OH, F) 2 , a new mineral from Zelentsovskaya mine near Magnitka (Zlatoust district, Southwestern Urals), is the OH-dominant equivalent of clinohumite Mg 9 [SiO 4 ] 4 (F,OH) 2 . The crystal structure of hydroxylclinohumite has been refined from single-crystal X-ray data to R = 0.026 for the 1912 observed unique reflections [F o  &gt; 4σ(F o ): a = 4.7480(3) Å, b = 10.2730(7) Å, c = 13.6894(2) Å, α = 100.72(1)°, V = 656.1(1) Å 3 , P2 1 /b (No. 14), Z = 2]. Twinning on {001}, which apparently doubles the c axis, was detected and a ratio of 0.94:0.06 between the volumes of the two twin components has been obtained by least-squares refinement. The crystal structure of hydroxylclinohumite corresponds to that of clinohumite except for the positions of the hydrogen atoms. The crystal chemistry of the clinohumite subgroup is discussed and a general formula M 2+  8 (M 2+ , M 4+ ) (SiO 4 ) 4 (OH, F, O) 2  (M 2+  and M 4+  mainly Mg and Ti, respectively) is proposed for it.

Hydroxylclinohumite, a new member of the humite group: Twinning, crystal structure and crystal chemistry of the clinohumite subgroup