Sjogrenite
Sjogrenite is a hydrated magnesium-iron carbonate hydroxide mineral. It forms radiating and fibrous aggregates with a pale to colorless appearance and a gentle, pearly to vitreous luster. The mineral often occurs as slender crystals or acicular clusters that can be intergrown with other phyllosilicates and carbonate minerals, giving it a delicate yet intriguing texture.
- Formula
- Mg6Fe3+2(OH)16(CO3) · 4H2O
- Rarity
- Rare
- Collector interest
- Moderate Interest
About Sjogrenite
Notable specimens have been reported from South Africa, where its occurrence is tied to hydrothermal and contact-metamorphic environments that promote hydration and carbonate stabilization. Collectors prize Sjogrenite for its fine-grained, glassy to silky finish and the way its pale hues shift with light, revealing subtle internal reflections. Though it can be delicate, well-formed crystals and aggregates offer attractive display pieces and add context for mineral paragenesis studies, highlighting the interplay of magnesium, iron, hydroxide, and carbonate components in diverse geologic settings.