Protoinerite is a chemical compound with the chemical formula Na9LiCu2As4S12. The spelling of protoinerite can be broken down using the International Phonetic Alphabet (IPA) phonetic transcription. The "pro" is pronounced as "pɹəʊ", "toi" is pronounced as "tɔɪ", "ne" as "ni", and "rite" as "raɪt". This compound is categorized as a sulfosalt mineral and is found in low-temperature hydrothermal deposits. Protoinerite's name comes from its relationship to inerite, another sulfosalt mineral in the same family.