Arfvedsonita
Arfvedsonita is a mineral with formula (Na,Ca)₂(Fe²⁺,Mg)₄Fe³⁺(Si₈O₂₂)(OH)₂, in the Silicatos (Inosilicatos) group. This specimen comes from Jebel Ewarghizen, Tirrhist, Anemzi, Agoudim, Midelt, Drâa-Tafilalet, Marruecos.
Description
Group of prismatic arfvedsonite crystals with parallel growth, striated faces of dark green, almost black colored crystals. On a feldspar matrix in beige tones.
About Arfvedsonita
Arfvedsonite is a mineral from the amphibole group, characterized by its dark color and vitreous luster. This specimen comes from a well-known Moroccan locality famous for its high-quality crystals. The matrix is made up of feldspar, a mineral group with the general formula KAlSi₃O₈ – NaAlSi₃O₈ – CaAl₂Si₂O₈, which includes microcline, orthoclase, and albite, adding contrast and volume to the piece.
Technical data
- Catalogue No.
- 0501
- Composition
- (Na,Ca)₂(Fe²⁺,Mg)₄Fe³⁺(Si₈O₂₂)(OH)₂
- Name
- Arfvedsonita
- Group
- Silicatos (Inosilicatos)
- Matrix
- Feldespato
- Mine
- Jebel Ewarghizen
- District / Municipality
- Tirrhist, Anemzi, Agoudim
- Province
- Midelt
- Region
- Drâa-Tafilalet
- Country
- Marruecos
- Size (cm)
- 5 x 3.3 x 0.4
- Etymology
- In honor of the Swedish chemist Johan August Arfwedson.
- Quality
- Buena
- Value trend
- Estable
Related specimens
- Goethita (Botroidal) — Marruecos
- Malaquita (Fibrosa) — Marruecos
- Vanadinita — Marruecos
- Eritrina (Punta de lanza) — Marruecos
- Eritrina (Acicular) — Marruecos
- Pirolusita (Pseudomorfa parcial tras manganita) — Marruecos
- Malaquita (Pseudomorfa tras Azurita) — Marruecos
- Vanadinita — Marruecos