NEW OCCURRENCE OF FERRIERITE
1971 Volume 6 Issue 5 Pages 343-364
Details
1971 Volume 6 Issue 5 Pages 343-364
Ferrierite is a very rare mineral of the zeolite group. It was named and described in 1918 by Graham. A zeolite was collected at the Itomuka mine in Hokkaido, Japan, in 1953. A preliminary investigation revealed that this mineral was ferrierite. Ferrierite from this locality occurs mainly as spherical aggregates of radiating blades and as interstitial fillings in propylite. This ferrierite is found in association with calcite, barite, pyrite and especially closely connected with heulandite. It is white in color, with a vitreous luster, and up to 0.5mm in length. The first identification of this ferrierite was made by the X-ray powder method. Its Chemical composition was close to the result of Graham's analysis, though ours was poorer in Mg than Graham's. The chemical formula will be best represented by (Na1.32K1.57)Mg1.09(Si30.95Al5.03Fe0.01)35.99O72.01•18.82H2O. The indices of refraction measured are α=1.483 β=1.484 γ=1.486 and the specific gravity is 2.06. Thermal properties of this ferrierite were studied by means of the derivatograph. Its DTA curve showed a large endothermic peak between 250°C and 260°C. A DTG curve revealed that its dehydration rate reaches a maximum of 0.85mg/min. at 260°C.
