I’m starting to mess around with materials, and when I create one I like, I’d like to save it so I can recall it like the MatLib. I’ve looked around the documentation but can’t find out how to do this. Any help would be appreciated. 
just make a plane with the material on it, and save that blend. when you make another material, save it on a plane, and append that plane, ( shift F1 ) to your new custom materials library. that’s what the matlib is.
Or in the material block press the F to save it (as fake) without object or mesh links.
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