Jarosewichite
A variety of Minerals
What is Jarosewichite?
Jarosewichite is a rare manganese arsenate mineral with formula: Mn3Mn(AsO4)(OH)6. It was first described in Franklin, New Jersey which is its only reported occurrence. Its chemical composition and structure are similar to chlorophoenicite. This mineral is orthorhombic with 2/m2/m2/m point group. Its crystals are prismatic or barrel-shaped. The color of jarosewichite is dark red to black. It has subvitreous luster of fracture surfaces and reddish-orange streak. This mineral occurs with flinkite, franklinite, andradite and cahnite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Jarosewichite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Jarosewichite Localities Map
See where Jarosewichite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Characteristics of Jarosewichite
The color of jarosewichite in nature is very dark red, sometimes black. It has subvitreous luster of fracture surfaces and reddish orange streak. The Mohs scale of hardness is almost 4. The density is 3.66(4) g/cm, which is determined by heavy liquid techniques. This value is very similar to the calculated result of 3.70 g/cm. In optical aspect, jarosewichite is biaxial and its refractive indices are α=1.780(5),β=1.795(5) and γ=1.805(5). The calculated value of 2V is 78°. The determination of refractive index and 2V has high standard errors, because the refractive index can be influenced by liquids and the crystal size is very small.
Composition of Jarosewichite
The chemical composition of jarosewichite was obtained in 1982. These data were obtained by electron microprobe analysis with a voltage of 15 kV and a current of 0.025μA. Manganite(Mn), synthetic olivenite(As), synthetic ZnO(Zn), and hornblende(Ca, Mg, Fe) are used as standards for the analysis. Water percentage of the sample cannot be measured directly because of lacking large size of sample. The composition of jarosewichite is as follows: As2O5 24.0 Mn2O3 17.7 FeO 0.4 MnO 42.3 ZnO 1.2 MgO 2.1 CaO 0.2 H2O 12.1 Total 100.0 The final calculation formula of unit cell contents is : [Mn1.00(Mn2.74Mg0.24Fe0.03Ca0.02Zn0.07)∑3.10(AsO4)0.95(OH)6.35], with Z=8 This result is very similar to the theoretical formula, which is Mn3Mn(AsO4)(OH)6. The theoretical weight percent of oxides are: Mn2O3=17.14, MnO=46.20, As2O5=24.95 and H2O=11.71, and the sum is 100.
Quick Facts
Physical Properties
- Color
- Dark red brown
- Hardness (Mohs)
- 4
- Density
- 3.18 g/cm³
- Streak
- Reddish orange
Chemical Properties
- Chemical Formula
- Mn2+3Mn3+(AsO4)(OH)6
- Elements
- As, H, Mn, O
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Jarosewichite FAQs
How do I identify Jarosewichite?
Jarosewichite can be identified by its hardness of 4 on the Mohs scale, Dark red brown color. Look for these key characteristics when examining specimens.
What color is Jarosewichite?
Jarosewichite typically appears in Dark red brown. Color can vary depending on impurities and formation conditions.
How hard is Jarosewichite?
Jarosewichite has a hardness of 4 on the Mohs scale. This gives it moderate hardness.
What is the characteristics of jarosewichite of Jarosewichite?
The color of jarosewichite in nature is very dark red, sometimes black. It has subvitreous luster of fracture surfaces and reddish orange streak. The Mohs scale of hardness is almost 4. The density is 3.66(4) g/cm, which is determined by heavy liquid techniques. This value is very similar to the calculated result of 3.70 g/cm. In optical aspect, jarosewichite is biaxial and its refractive indices are α=1.780(5),β=1.795(5) and γ=1.805(5). The calculated value of 2V is 78°. The determination of refractive index and 2V has high standard errors, because the refractive index can be influenced by liquids and the crystal size is very small.
What is the composition of jarosewichite of Jarosewichite?
The chemical composition of jarosewichite was obtained in 1982. These data were obtained by electron microprobe analysis with a voltage of 15 kV and a current of 0.025μA. Manganite(Mn), synthetic olivenite(As), synthetic ZnO(Zn), and hornblende(Ca, Mg, Fe) are used as standards for the analysis. Water percentage of the sample cannot be measured directly because of lacking large size of sample. The composition of jarosewichite is as follows: As2O5 24.0 Mn2O3 17.7 FeO 0.4 MnO 42.3 ZnO 1.2 MgO 2.1 CaO 0.2 H2O 12.1 Total 100.0 The final calculation formula of unit cell contents is : [Mn1.00(Mn2.74Mg0.24Fe0.03Ca0.02Zn0.07)∑3.10(AsO4)0.95(OH)6.35], with Z=8 This result is very similar to the theoretical formula, which is Mn3Mn(AsO4)(OH)6. The theoretical weight percent of oxides are: Mn2O3=17.14, MnO=46.20, As2O5=24.95 and H2O=11.71, and the sum is 100.
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