Eritrina Acicular
Eritrina is a mineral with formula Co₃(AsO₄)₂·8H₂O, in the Arseniatos group. This specimen comes from Distrito de Bou Azzer, Tazenakht, Ouarzazate, Drâa-Tafilalet, Marruecos.
Description
The Barnacle. Vertical acicular erythrite in fan arrays rising plume-like.
History of this specimen
Own entry on FMF: https://www.foro-minerales.com/forum/download.php?id=110812
About Eritrina
A hydrated cobalt arsenate mineral, characterized by its carmine color and acicular habit. It usually forms through secondary oxidation in cobalt-rich zones. More specifically, erythrite results from the weathering of skutterudite upon exposure to oxygen. Historically, it has served as an indicator mineral in prospecting, confirming the existence of nickel, cobalt, or silver mineralizations at greater depths.
About the locality
Bou Azzer is one of the classic world localities for erythrite. It lies in a cobalt-mineralised belt that has produced fine crystals since the early 20th century.
Technical data
- Catalogue No.
- 0171
- Composition
- Co₃(AsO₄)₂·8H₂O
- Name
- Eritrina
- Variety
- Acicular
- Group
- Arseniatos
- Category
- Cresta Montis
- Matrix
- Matriz oscura y densa
- Mine
- Distrito de Bou Azzer
- District / Municipality
- Tazenakht
- Province
- Ouarzazate
- Region
- Drâa-Tafilalet
- Country
- Marruecos
- Size (cm)
- 6 x 4 x 3
- Weight
- 41.7 g
- Ex-collection
- Diego Navarro
- Etymology
- From the Greek "erythros" ("red"), in reference to its characteristic colour.
- Quality
- Notable
- Value trend
- Al alza
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