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4½ - 5
Crystal System:
Named in 1913 by Charles Palache and Waldemar Theodore Schaller in recognition of Harold Howe Hodgkinson [June 2, 1886 Toronto, Ontario, Canada - October 10, 1947 New Rochelle, New York, USA], assistant Underground Superintendent of the Franklin Mine and brought the mineral to the attention of Charles Palache. In later life, Hodgkinson rose in business to be president of the Hodge and Hammond Company, dealers of construction equipment in the Bronx, New York, New York.
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Classification of HodgkinsoniteHide

Approved, 'Grandfathered' (first described prior to 1959)

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
2 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Physical Properties of HodgkinsoniteHide

4½ - 5 on Mohs scale

Optical Data of HodgkinsoniteHide

Biaxial (-)
RI values:
nα = 1.720 nβ = 1.741 nγ = 1.746
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v moderate

Chemical Properties of HodgkinsoniteHide

IMA Formula:
Common Impurities:

Crystallography of HodgkinsoniteHide

Crystal System:
Cell Parameters:
a = 11.76 Å, b = 5.31 Å, c = 8.18 Å
β = 95.42°
a:b:c = 2.215 : 1 : 1.54
Unit Cell V:
508.52 ų (Calculated from Unit Cell)

Type Occurrence of HodgkinsoniteHide

Other Language Names for HodgkinsoniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Zincite30 photos of Hodgkinsonite associated with Zincite on
Hetaerolite27 photos of Hodgkinsonite associated with Hetaerolite on
Franklinite18 photos of Hodgkinsonite associated with Franklinite on
Willemite14 photos of Hodgkinsonite associated with Willemite on
Chlorophoenicite11 photos of Hodgkinsonite associated with Chlorophoenicite on
Copper10 photos of Hodgkinsonite associated with Copper on
Franklinfurnaceite6 photos of Hodgkinsonite associated with Franklinfurnaceite on
Baryte6 photos of Hodgkinsonite associated with Baryte on
Fluorite5 photos of Hodgkinsonite associated with Fluorite on
Sussexite4 photos of Hodgkinsonite associated with Sussexite on

Related Minerals - Nickel-Strunz GroupingHide

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2OOrth.
9.AE.10EuclaseBeAl(SiO4)(OH)Mon. 2/m : P21/b
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
9.AE.30ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
9.AE.35StringhamiteCaCu(SiO4) · H2OMon.
9.AE.40Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20Mon. 2/m : B2/m
9.AE.50SphaerobertranditeBe3(SiO4)(OH)2Mon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide 2/m : P21/b · H2OMon. m : Bb

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
14.7.16ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
14.7.17JunitoiteCaZn2Si2O7 · H2OOrth. mm2
14.7.18LarsenitePbZnSiO4Orth. mm2 : Pna21
14.7.19EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b
14.7.22GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
14.7.23FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2

Other InformationHide

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 HodgkinsoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, C. and Schaller, W.T. (1913): Hodgkinsonite, a new mineral from Franklin Furnace, New Jersey. J. Wash. Acad. Sci., 3(19), 474-478.
Roberts, W.M.B. and Quodling, F.M. (1962): X-ray, optical, and morphological observations on hodgkinsonite from Franklin Furnace. Mineral. Mag., 33, 343-346.
Rentzeperis, P.J. (1963): The crystal structure of hodgkinsonite, Zn2Mn[(OH)2SiO4]: Zeitschrift für Kristallographie, 119, 117-138.
Dunn, P.J. and Bostwick, R.C. (1982): Hodgkinsonite from Franklin and Sterling Hill, New Jersey: a review. Mineralogical Record, 13, 229-232.

Internet Links for HodgkinsoniteHide

Localities for HodgkinsoniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Palache(1935):111; Dunn(1995):Pt3:373.
FOMS Millsite Committee (1986) (circa), List of Mineral Species Found on the Franklin Mill Site, Franklin-Ogdensburg Mineralogical Society (unpublished).
        • Ogdensburg
          • Sterling Hill
Cook, D.K.: Recent work on the mins. of Franklin & Sterling Hill, NJ: Min.Rec.:4:62-66 (1973); Dunn(1995):Pt3:375-376.
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