Abstract
The crystal structure of an Agoura clinoptilolite has been studied at 350°C. The monoclinic cell at room temperature is distorted to triclinic, giving cell dimensions of a=17.698(15)Å, b=17.511(8)Å, c=7.392(5)Å, α=90.21(5)°, β=116.76(5)°, γ=90.19(5)Å. The probable space group is C-1. Structure analysis revealed that the potassium atom located at the M(3) site at room temperature is still preserved at around the same site while those located at the cation sites other than M(3) are missing. The result supports the prediction made by Koyama and Takéuchi (1977) regarding the thermal stability of clinoptilolite.
