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Nuwaite (Ni 6 GeS 2 , I MA 2013 -018) and butianite (Ni 6 SnS 2 , I MA 2016 -028) are two new chalcogenide minerals, occurring as micrometer-sized crystals with grossular, Na-bearing melilite, heazlewoodite, and Ge-bearing Ni-Fe alloys in veins and as mono-mineralic crack-filling material in igneous diopside in the Type B1 Ca-Al-rich inclusion (CAI)  ACM -2 from the Allende CV3 carbonaceous chondrite. The chemical composition of type nuwaite is (wt%) Ni 65.3, S 10.3, Ge 8.2, Te 7.9, Sn 5.1, and Fe 1.7, with a sum of 98.5 and an empirical formula of (Ni 5.95 Fe 0.16 )(Ge 0.60 Sn 0.23 )(S 1.72 Te 0.33 ). The simplified formula is Ni 6 (Ge,Sn)(S,Te) 2 , leading to an end-member of Ni 6 GeS 2 . The chemical composition of type butianite is (wt%) Ni 62.1, Sn 8.9, Te 10.3, S 8.9, Ge 5.3, Fe 1.3, sum 99.1, giving rise to an empirical formula of (Ni 5.93 Fe 0.13 )(Sn 0.52 Ge 0.41 )(S 1.56 Te 0.45 ). Butianite’s simplified formula is Ni 6 (Sn,Ge) (S,Te) 2  and the end-member formula is Ni 6 SnS 2 . Both nuwaite and butianite have an  I 4/ mmm  inter-growth structure with  a  = 3.65 Å,  c  = 18.14 Å,  V  = 241.7 Å 3 , and  Z  = 2. Their calculated densities are 7.24 and 7.62 g/cm 3 , respectively. Nuwaite and butianite are the first known meteoritic minerals with high Ge and Sn concentrations.

Nuwaite (Ni 6 GeS 2 ) and butianite (Ni 6 SnS 2 ), two new minerals from the Allende meteorite: Alteration products in the early solar system