Thermal Analysis Curves of Borate Minerals

Borate minerals lose crystalline water at a temperature lower than 250 °C and constitution water at a temperature higher than 250 °C, then they recrystallize and subsequently melt at high temperatures. 

Sassolite—170 °C endotherm, sassolite melts 196 °C endotherm, molten sassolite decomposes to BjO, and releases H2O. 

Vonsenite—759 C exotherm, vonsenite decomposes and oxidizes Fe20, and FeBO, are formed 980 °C endotherm, FeBO, melts. 

105 °C endotherm, tincalconite releases crystalline water 169 °C endotherm, tincalconite releases constitution water and forms Na2B40y 110 °C endotherm, borax releases crystalline water 163 °C endotherm, borax releases constitution water and is transformed to Na2B407,- 645 and 690 °C endotherms, Na2B407 melts. 

Inderite—186 °C endotherm, inderite dehydrates 763 °C exotherm, the dehydrated substance recrystallizes 1106 °C endotherm, borates melt. 

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