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.
Truncation (geometry) is the removal of one or more parts, as for example in truncated cube; Propositional truncation, a type former which truncates a type down to a mere proposition; Computer science. Data truncation, an event that occurs when a file or other data is stored in a location too small to accommodate its entire length