GSINET | Geological Survey of Iran , North - East Territory

Writers : Miranvari,Aezam;Ebrahimi,Khosrow;Homam,Masoud
Refference : 11th Symposium Of Geological Society Of Iran - Mashhad, Ferdowsi University
Publishing Year : 1386

Abstract :

Yasmina deposite is located in Khorasan Razavi province, 10 km to the� North-west of Gonabad.
Yasmina deposite is made by hydrothermal alteration of acidic volcanic rocks mainly of dacite, riodacite and ryolite.
Kaolinite, quartz and muscovite are the main mineral compositions.
As quartz in the volcanic rocks is cryptocrystalline, it is too difficult to separate� it� from� kaolinite.
The chemical composition of Yasmina clays shows that the percentage of SiO2 is high but the amount of Al2O3 is low. So the ceramic products of Yasmina clays have high roughness, low plasticity and lower resistance to thermal shocks and module of rupture. The percentage of CaO and K2O is� high.
The high percentage of CaO which has a high melting point (2600°C) can raise the viscosity as a result lead to crack in ceramic products.
The high percentage of K2O which plays as a flux in ceramic products is� high in Yasmina.

Subject List : kaolinitic clay

Articles

The mineralogy, chemical composition and industrial application of Yasmina kaolinitic clay