Alinite

Alinite is a mineral with the chemical formula Ca10(Mg,Al)2(SiO4)4(OH)2. It is a calcium magnesium aluminum silicate hydroxide. Alinite is a relatively rare mineral and is found in specific geological environments. It was first described in 1985 from samples discovered in the Poudrette quarry in Mont-Saint-Hilaire, Quebec, Canada. Its name honors the American mineralogist Albertite.

The mineral typically occurs as small, translucent, white to pale yellow crystals. It is often found in association with other rare minerals in alkaline igneous rocks, particularly in pegmatites and related rocks. These environments are characterized by high concentrations of alkali elements and a lack of silica. Alinite forms under conditions of moderate temperature and pressure.

Structurally, alinite is a member of the silicates, specifically belonging to the sorosilicate group. Its crystal structure is complex, featuring isolated SiO4 tetrahedra and pairs of tetrahedra. The presence of both magnesium and aluminum in the structure contributes to its unique properties and occurrence. Due to its rarity and specific formation conditions, alinite is of interest to mineralogists studying the petrology and geochemistry of alkaline rock complexes. It is not a commercially significant mineral and is primarily collected by mineral enthusiasts and researchers.