When can taste be used to help identify rocks?

Question

Taste can be used to distinguish halite (ordinary salt) from sylvite (which has some bitterness) and siltstone from mudstone (the latter has a creamy texture while the grains of the former can be felt). Are there other uses of taste for identification?

Answer 1

Not exactly taste, but the pull of the moisture from your tongue can be used to help discriminate between "clay" minerals (e.g. illmenite)