From the geology course I took in 1975: Minerals are naturally occurring crystals of compound. Snow is a mineral, but volcanic glass is not. Rocks are amalgams of minerals and non-minerals.
In corpus linguistics, a collocation is a sequence of words or terms that co-occur more often than would be expected by chance. In phraseology, collocation is a sub-type of phraseme. An example of a phraseological collocation, as propounded by Michael Halliday, is the expression strong tea.
Traditionally, a colloquium is a gathering of academics in order to discuss a topic and interact with one another in the spirit of sharing information and perspective with one's peers. Etymologically, colloquium comes from the Latin words for speaking or to speak (loqui, -loquium) and the prefix indicating together..