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Studies were carried out for the purpose of obtaining the information about the crystallization of the glasses having the compositions of Li2Ca(Mg3A12) (Al2Si6)O22F2 and of added 0.5, 075, 1.0, 2.5mol excess Li2O to this composition. After the glasses were heat treated from 550•Ž to 1150•Ž for 192 hours, the precipitated crystals were examined by X-ray diffract method. The results obtained were summarized as follows:

yōgyō kyōkaishi/yougyou kyoukaishi

Studies on Precipitated Crystals from Glasses of System Li&lt;sub&gt;2&lt;/sub&gt;O-MgO-CaO-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-SiO&lt;sub&gt;2&lt;/sub&gt;-F