montroyaliteEtymologyNamed for type locality Mount Royal in Montreal, where the mineral was discovered, + -ite.montroyalite means a whitish brittle translucent fibrous crystalline mineral with the empirical chemical formula Sr₄Al₈(CO₃)₃(OH)₁₃F₁₂•10.5(H₂O) Lexicurio rates it Sui generis — a strength score of 87 out of 100.nouna whitish brittle translucent fibrous crystalline mineral with the empirical chemical formula Sr₄Al₈(CO₃)₃(OH)₁₃F₁₂•10.5(H₂O)