Periclase diopside

Mullite Anorthite Gehlenite Lime Mullite Anorthite Lime (tr.) Periclase( ) Crist. Anorthite Mg-Al-Si No.2 Spinel Crist. Mg-Al-Si No.2 Spinel Anorthite Cordierite( ) Diopside( )... 

Figure 13 Bulk compositions of aluminum-rich chondrules plotted in the system Al203-Mg2Si04-Ca2Si04 and projected from spinel (MgAl204). Mineral abbreviations An = anorthite, Grs = grossite, Cor = corundum, Cord = cordierite, Di = diopside, Fo = forsterite, Geh = gehlenite, Hib = hibonite, La = lamite, L = liquid, Mel = melilite solid solution. Mull = mullite. Mo = monticellite, Mw = merwinite. Per = periclase. Pyx = pyroxene solid solution, Saph = sapphirine (data from Bischoff and Keil (1984), Sheng et al. (1991), Huss et al.

Total MgO content in clinker is normally maintained at less than 2.0% to avoid expansion in the autoclave test. Belite containing periclase (at an early stage of crystallization) indicates coarse grains of MgO-bearing silicates, such as diopside, pyroxene, and hornblende in the raw feed. Dendritic periclase occurs in slowly cooled clinkers from large kilns (200 t/hr) and is hardly observed in clinkers from small kilns (20 t/ hr), according to Ono (1995). 

Belite cluster with small periclase crystals Large diopside (CaMgSi Og) grain (Fundal, 1980)... 

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