For example the melting point of Capric acid is 30, and caprylic acid 17. However a mixture of 50:50% of capric: caprylic gives a melting point of about 7 ( with melting point apparatus)!!!? However if we calculated mathematically:
it would be = 0.5 X 30 + ( 0.5 X 17) = 23.5 degree celsius.
Same idea mixture of oleic, linoleic, linolenic,....etc.
This shows you, that you components are not co-crystalized, decreasing the order in the crystal and thus the energy necessary for a phase change.
Only if you components are chemically miscible with each other and co-crystalize, you'll get an intermediate melting point (Not necessarily calculated like you did, since molecular interactions are more important than mere ratio).
I totally agree with Mr. Hammann. You probably have an euthetic mixture.
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