Arakiite
From Wikipedia, the free encyclopedia
CategoryMinerals
Formula(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As3+O3)(As5+O4)2(OH)23
IMA symbolArk
ColorRed-brown to orange-brown
| Arakiite | |
|---|---|
| General | |
| Category | Minerals |
| Formula | (Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As3+O3)(As5+O4)2(OH)23 |
| IMA symbol | Ark |
| Identification | |
| Color | Red-brown to orange-brown |
| Mohs scale hardness | 3-4 |
| Luster | Earthy |
| Streak | Pale-brown, red-brown |
| Diaphaneity | Translucent, Opaque |
| Specific gravity | 3.41 |
| Density | 3.41 g/cm3 |
Arakiite (IMA symbol: Ark[1]) is a rare mineral with the formula (Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As3+O3)(As5+O4)2(OH)23.[2] It is both arsenate and arsenite mineral, a combination that is rare in the world of minerals. Arakiite is stoichiometrically similar to hematolite. It is one of many rare minerals coming from the famous Långban manganese skarn deposit in Sweden. Other minerals bearing both arsenite and zinc include kraisslite and mcgovernite.[3]
The mineral crystallizes in the monoclinic crystal system in space group Cc.[4]
