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Sterlinghillite

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Formula:
Mn3(AsO4)2 · 4H2O
System:
Triclinic
Colour:
White, pale pinkish ...
Hardness:
3
Name:
Named in 1981 by Pete J. Dunn after its discovery locality, the Sterling Mine, Sterling Hill, Ogdensburg, New Jersey, USA.
Isostructural with:
Ludlamite Group

Occurs as tiny light white to pale pinkish white spherules on fracture surfaces, also irregular acicular crystals. Few verified specimens known from the type locality.

Classification of Sterlinghillite

Approved 1980
Explanation of status:
Matsubara et al. (2000) suggest that formula contains only 3 H2O.
8.CD.25

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
40.3.5.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
20.8.9

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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First Recorded Occurrence of Sterlinghillite

General Appearance of First Recorded Material:
Tiny pinkish white spherules or white acicular crystals.
Year of Discovery:
1980
Geological Setting of First Recorded Material:
As a secondary mineral on fracture surfaces traversing franklinite-calcite ore in a Precambrian Zn-Mn-Fe orebody.
Associated Minerals at First Recorded Locality:

Physical Properties of Sterlinghillite

Waxy, Greasy, Silky
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
White, pale pinkish white, also very pale pink.
Comment:
Usually white
Streak:
White
Hardness (Mohs):
3
Tenacity:
Brittle
Fracture:
Splintery
Density:
2.94 g/cm3 (Measured)    3.48 g/cm3 (Calculated)

Crystallography of Sterlinghillite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Space Group Setting:
P1
Cell Parameters:
a = 10.398Å, b = 10.672Å, c = 7223Å
α = 90.10°, β = 109.10°, γ = 71.83°
Ratio:
a:b:c = 0.974 : 1 : 676.818
Z:
2
Morphology:
Acicular crystals or mound-like botryoids showing a non-radial fibrous texture
X-Ray Powder Diffraction Data:
d-spacingIntensity
11.12 (100)
6.39 (30)
3.692 (30)
3.209 (100)
2.880 (40)
2.848 (40)
2.751 (60)

Optical Data of Sterlinghillite

Type:
Uniaxial (-)
RI values:
nα = 1.656 nγ = 1.671
Birefringence:
0.015
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of Sterlinghillite

Formula:
Mn3(AsO4)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Sterlinghillite to other Species

8.CD.05KolbeckiteScPO4 · 2H2O
8.CD.05MetavarisciteAlPO4 · 2H2O
8.CD.05PhosphosideriteFePO4 · 2H2O
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2O
8.CD.10ScoroditeFe3+AsO4 · 2H2O
8.CD.10StrengiteFePO4 · 2H2O
8.CD.10VarisciteAlPO4 · 2H2O
8.CD.10YanomamiteInAsO4 · 2H2O
8.CD.15ParascoroditeFeAsO4 · 2H2O
8.CD.20Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2O
8.CD.30RollanditeCu3(AsO4)2 · 4H2O
20.8.1SarkiniteMn22+(AsO4)(OH)
20.8.2EveiteMn22+(AsO4)(OH)
20.8.3ArsenoclasiteMn52+(AsO4)2(OH)4
20.8.4FlinkiteMn22+Mn3+(AsO4)(OH)4
20.8.5JarosewichiteMn32+Mn3+(AsO4)(OH)6
20.8.6AllactiteMn72+(AsO4)2(OH)8
20.8.7KrautiteMn(HAsO4) · H2O
20.8.8SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
20.8.10GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2O
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
20.8.16Wallkilldellite-(Mn)Ca2Mn32+(AsO4)2(OH)4 · 9H2O
20.8.17BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
20.8.18Manganberzeliite(Ca,Na)3(Mn2+,Mg)2(AsO4)3
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
20.8.22GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O

Other Names for Sterlinghillite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Sterlinghillite

Reference List:
Dunn, P. J. (1981): Sterlinghillite, a new hydrated manganese arsenate mineral from Ogdensburg, New Jersey: American Mineralogist: 66, 182-184.

Dunn, P.J. (1995): Franklin and Sterling Hill New Jersey: The World's Most Magnificent Mineral Deposits: Part 5: 682-683.

Matsubara, S., R. Miyawaki, T. Mouri, M. Kitamine (2000): Sterlinghillite, a rare manganese arsenate, from the Gozaisho mine, Fukushima Prefecture, Japan. Bulletin of the National Science Museum, Tokyo, Series C, 26(1-2), 1-7.

Internet Links for Sterlinghillite

Localities for Sterlinghillite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Japan
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Iwaki
Ryuji Marumoto collection; Matsubara, S., Miyawaki, R., Kato, A., Matsuyama, F., Mouri, T. and Suzuki, Y. (2001): Arseniopleite from the Gozaisho mine, Fukushima Prefecture, Japan. Bulletin of the National Science Museum, Tokyo, Ser. C, 27, 51-62.
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Dunn, P.J. (1981), Am. Min.: 66: 182-184; Dunn, P.J. (1995): Pt5: 682-683.
Mineral and/or Locality  
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