Abstract
This study was made of the relationship between glass stones in brown bottle glass and impure minerals in quartz sand and dolomite which were used as raw materials.
From the mineralogical study of the stones, the bulk of them was found to consist of silicious and aluminous minerals which were introduced from quartz sand and refractory bricks. Some amounts of spinels and other optical isotropic minerals were found as constituent minerals of stones.
As impurities in raw materials following minerals and rocks were found;
Quartz sand: magnetite, hematite, ilmenite, chart and hornfels.
Dolomite: diopside, hornblende, mica, anorthite, glossularite, spinel, graphite, magnetite, pyrrhotite and lamprophyer.
Solubilities of the minerals in molten glass indicate that some amounts of spinel, ilmenite and glossularite probably remained as stones during glass melting process, and spinels which were found in glass stones had the same forms as in the dolomite. Chart and hornfels, however, cannot remain as insoluble silicious minerals because of their high solubilities.
