Second finding of nekoite

Fibrous-radiated nekoite [32237-29-9], intimately intergrown with heulandite and apophyllite, occurs as a cavity filling in basalt from the Caxias do Sul region, Rio Grande do Sul, Brazil. Chem. analyses confirm the ideal nekoite formula, Ca3Si6O15·8H2O, of R.A.Chalmers, et al. (1962). Indexing of x-ray powder data yields the lattice parameters a 7.588(3), b 9.793(5), and c 7.339(5) Å with α 111°46' (4'), β 130°20' (3'), and γ 86°32' (2'). Thermogravimetric anal., DTA, and IR spectral data are given.Indexing