ravimiametite

Ravimiametite is a hypothetical phosphate-silicate mineral used in mineralogy nomenclature exercises and illustrative discussions. It is described as a rare constituent found in pegmatitic veins within ultramafic rock complexes. The name derives from the fictional Ravimia region and the common mineral suffix -ite.

Composition and structure: Ravimiametite shows a solid solution between iron- and manganese-rich phosphates and silicates, with calcium and sodium as substituting cations. The chemical formula is variable, reflecting substitutions among Fe2+, Mn2+, Ca2+, Na+, and traces of titanium. The crystal structure is described as monoclinic, with prismatic habit in well-formed crystals; common morphologies include slender prisms and tabular aggregates.

Physical properties: Ravimiametite typically presents a green to olive-green color, with a vitreous to resinous luster. It has a Mohs hardness around 5.5 and a measured density near 3.6–3.9 g/cm3. Cleavage is indistinct to fair on {010}, with an uneven fracture.

Occurrence and formation: It forms at elevated temperatures in pegmatitic veins and hydrothermal systems within ultramafic settings. Associated minerals include quartz, spodumene, apatite, hedenbergite, and fluorapatite. The mineral is considered a potential indicator of phosphorus-rich, silica-bearing fluids.

Occurrence and significance: Because of its rarity and variable composition, ravimiametite is primarily of interest to mineral collectors and theoretical geologists. It serves as a case study for phosphate-silicate solid-solution behavior and for mineralogical naming conventions in fictive or experimental contexts.