High-purity silica-glass tubes have been used as containers for synthetic silicate melt and mineral-melt experiments. Experiments were conducted in air at 1300-1400 °C using compositions in the system CaO-MgO-Al2O3-SiO2. During an experiment, part of the interior of the silica container dissolves into the starting mixture at high temperature resulting in a melt composition that is saturated with silica. An open container can maintain its integrity for at least 95 h; evacuated containers for at least 46 h. Diopside and protoenstatite along with a SiO2 phase have each been crystallized in different experiments. Silica-glass containers are useful when conventional container materials are unsuitable.