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Jarosewichite

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Buckwheat Pit (Southwest Opening; Buckwheat Mine), Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
© Van King

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Formula:
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
System:OrthorhombicColour:Dark red brown
Hardness:4
Name:Named in 1982 for Eugene Jarowsewich (1926-) mineral analyst, Department of Mineral Sciences, Smithsonian Institution.


Dark brown tightly intergrown brush-like to divergent clusters of crystals.

Classification of Jarosewichite

IMA status:Approved
Strunz 8th edition ID:7/B.17-30
Nickel-Strunz 10th (pending) edition ID:8.BE.70

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
Dana 8th edition ID:41.1.1.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p > 4:1
Hey's CIM Ref.:20.8.5

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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Type Occurrence of Jarosewichite

Type Locality:Buckwheat Pit (Southwest Opening; Buckwheat Mine), Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
General Appearance of Type Material:Etched and vuggy granular dark olive green andradite and franklinite.
Year of Discovery:1982
Associated Minerals at type locality:
HausmanniteFrankliniteFlinkiteCahniteAndradite

Physical Properties of Jarosewichite

Lustre:Sub-Vitreous, Resinous, Greasy
Diaphaneity (Transparency):Translucent
Colour:Dark red brown
Streak:Reddish orange
Hardness (Mohs):4
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (measured):3.66 g/cm3
Density (calculated):3.18 g/cm3

Crystallography of Jarosewichite

Crystal System:Orthorhombic
Class (H-M):2 2 2 - Disphenoidal
Cell Parameters:a = 6.56Å, b = 25.2Å, c = 10Å
Ratio:a:b:c = 0.26 : 1 : 0.397
Unit Cell Volume:V 1,653.12 ų (Calculated from Unit Cell)
Morphology:Rarely in rod-like crystals with square cross-section, also in tabular to flattened crystals, usually in slightly divergent groups.
X-Ray Powder Diffraction:
d-spacingIntensity
6.29 (20)
3.91 (60)
2.67 (100)
2.50 (30)
1.788 (50)
1.567 (20)
1.558 (30)
1.501 (20)
Comments:41-580

Optical Data of Jarosewichite

Type:Biaxial (-)
RI values: nα = 1.780 nβ = 1.795 nγ = 1.805
2V:Measured: 78° , Calculated: 76°
Birefringence:0.025
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v distinct
Optical Extinction:Parallel
Pleochroism:Weak
Comments:XYZ = abc; X medium brownish red, Z dark brownish red
Comments:Reactive with some Refractive index liquids

Chemical Properties of Jarosewichite

Formula:
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
Essential elements:As, H, Mn, O
All elements listed in formula:As, H, Mn, O
Common Impurities:Mg

Relationship of Jarosewichite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BE.05Augelite
Al
 
2
(PO
 
4
)(OH)
 
3
8.BE.10Grattarolaite
Fe
3+
3
(PO
 
4
)O
 
3
8.BE.15Cornetite
Cu
 
3
(PO
 
4
)(OH)
 
3
8.BE.20Clinoclase
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.25Arhbarite
Cu
 
2
Mg(AsO
 
4
)(OH)
 
3
8.BE.25Gilmarite
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.30Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
8.BE.30Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
8.BE.30Raadeite
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
8.BE.30Argandite
Mn
 
7
(VO
 
4
)
 
2
(OH)
 
8
8.BE.35Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.35Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.40Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
(AsO
 
4
)(OH)
 
5
8.BE.45Dixenite
CuMn
2+
14
Fe
2+
 
(SiO
 
4
)
 
2
(As
5+
 
O
 
4
)(As
3+
 
O
 
3
)
 
5
(OH)
 
6
8.BE.45Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Kraisslite
(Mn
2+
 
,Mg)
 
24
Zn
 
4
(SiO
 
4
)
 
8
(AsO
 
4
)
 
4
(OH)
 
12
8.BE.45Mcgovernite
Mn
 
19
Zn
 
3
(AsO
 
4
)
 
3
(AsO
 
3
)(SiO
 
4
)
 
3
(OH)
 
21
8.BE.45Arakiite
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Turtmannite
(Mn,Mg)
 
22.5
Mg
 
3-3x
((V
5+
 
,As
5+
 
)O
 
4
)
 
3
(As
3+
 
O
 
3
)
 
x
(SiO
 
4
)
 
3
O
 
5-5x
(OH)
 
20+x
8.BE.50Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
 · 2H
 
2
O
8.BE.55Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
8.BE.60Kolicite
Mn
2+
7
Zn
 
4
(AsO
 
4
)
 
2
(SiO
 
4
)
 
2
(OH)
 
8
8.BE.65Sabelliite
(Cu,Zn)
 
2
Zn(AsO
 
4
,SbO
 
4
)(OH)
 
3
8.BE.75Theisite
Cu
 
5
Zn
 
5
(AsO
 
4
,SbO
 
4
)
 
2
(OH)
 
14
8.BE.80Coparsite
Cu
 
4
(AsO
 
4
,VO
 
4
)O
 
2
Cl
8.BE.85Waterhouseite
Mn
2+
7
(PO
 
4
)
 
2
(OH)
 
8
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.3Arsenoclasite
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
20.8.4Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
20.8.6Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
20.8.7Krautite
Mn(HAsO
 
4
) · H
 
2
O
20.8.8Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
 · 2H
 
2
O
20.8.9Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
20.8.10Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 10H
 
2
O
20.8.11Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
 · 4H
 
2
O
20.8.12Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.8.13Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
2
O
20.8.14Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.15Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.16Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
20.8.17Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
20.8.18Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
20.8.19Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.8.20Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.8.21Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
20.8.22Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O

Other Names for Jarosewichite

Synonyms:
IMA1981-060
Other Languages:
German:Jarosewichit
Spanish:Jarosewichita

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Jarosewichite

Reference List:

- +
Dunn, P. J.; Peacor, D. R.; Leavens, P. B. & Simmons, W. B. (1982): Jarosewichite and a related phase: basic manganese arsenates of the chlorophoenicite group from Franklin, New Jersey. American Mineralogist: 67, 1043-1047.

King, Van, 1993, The Flinkite/Cahnite/Jarosewichite Assemblage from Franklin, New Jersey, The Picking Table, 34: 10-13.

Internet Links for Jarosewichite

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    • Localities for Jarosewichite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    		Dunn, et al: Jarosewichite and a related phase: basic manganese arsenates of the chlorophoenicite group from Franklin, NJ: Am. Min.:67:1043-1047 (1982); Dunn(1995):Pt5:669-670.
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