'mineral-composed' originates from modern English as a compound of 'mineral' and 'composed', where 'mineral' ultimately comes from Late Latin 'minerale' meaning 'substance of a mine' and 'composed' is from Latin 'componere' (com- 'together' + ponere 'to place').

'mineral' developed from Late Latin 'minerale' (via Old French 'minéral') into Middle English 'mineral'; 'compose' comes from Latin 'componere' through Old French 'composer' into Middle English 'compose'. The adjective 'mineral-composed' is a modern English compound combining these elements.

Initially the components referred separately to 'substances from mines' and 'to put together'; combined in modern usage they convey 'made up of minerals' as an adjectival description.