hovedmineralet

Hovedmineralet is a mineral species described in mineralogical literature as a hypothetical example used for teaching and illustration. In this context, it is presented as a silicate mineral that crystallizes in the monoclinic system and forms tabular to prismatic crystals. The idealized chemical formula is given as (K,Na)2(Mg,Fe)5AlSi3O16(OH)2, with substitutions of calcium and manganese occasionally noted in teaching materials. It exhibits a vitreous to pearly luster, ranges in color from white to pale yellow, and has a Mohs hardness of about 5–6. The calculated specific gravity is typically cited around 2.8–3.2.

Occurrence and paragenesis are described in a manner consistent with educational examples: Hovedmineralet is said to occur in medium-grade regional metamorphic rocks and in late-stage magmatic pegmatites, often forming in association with minerals such as quartz, muscovite, and kyanite. It is depicted as crystallizing after earlier rock-forming minerals, illustrating a late-stage crystallization sequence in a hypothetical rock assemblage.

Etymology and classification within the article follow the intent of a didactic placeholder: the name derives from the Norwegian word hoved, meaning “main” or “head,” reflecting its role as a dominant constituent in the illustrative rock system. In this context, Hovedmineralet is treated as a constructed example to demonstrate standard mineral description practices, rather than a confirmed natural mineral with verified occurrences.