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Hodgkinsonite

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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
© JBS 2006

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Formula:
Mn
2+
 
Zn
 
2
(SiO
 
4
)(OH)
 
2
System:MonoclinicHardness:4½ - 5
Name:Named for H.H. Hodgkinson, Assistant Underground Superintendent of the Franklin mine, who discovered the mineral.
This page provides mineralogical data about Hodgkinsonite.

Classification of Hodgkinsonite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/B.01-20
Nickel-Strunz 10th (pending) edition ID:9.AE.20

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
Dana 8th edition ID:52.2.1.3

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
Hey's CIM Ref.:14.7.20

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

Co-type Localities:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Hamburg Mine (Hamburg Road Mine), Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Year of Discovery:1913

Physical Properties of Hodgkinsonite

Hardness (Mohs):4½ - 5

Crystallography of Hodgkinsonite

Crystal System:Monoclinic
Cell Parameters:a = 11.76Å, b = 5.31Å, c = 8.18Å
β = 95.42°
Ratio:a:b:c = 2.215 : 1 : 1.54
Unit Cell Volume:V 508.52 ų (Calculated from Unit Cell)
Z:4

Optical Data of Hodgkinsonite

Type:Biaxial (-)
RI values: nα = 1.720 nβ = 1.741 nγ = 1.746
Maximum Birefringence:δ = 0.026

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r < v moderate

Chemical Properties of Hodgkinsonite

Formula:
Mn
2+
 
Zn
 
2
(SiO
 
4
)(OH)
 
2
Essential elements:H, Mn, O, Si, Zn
All elements listed in formula:H, Mn, O, Si, Zn
Common Impurities:Fe,Mg,Ca

Relationship of Hodgkinsonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AE.05Beryllite
Be
 
3
(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.AE.10Euclase
BeAl(SiO
 
4
)(OH)
9.AE.15Sverigeite
NaMnMgSnBe
 
2
(SiO
 
4
)
 
3
(OH)
9.AE.25Gerstmannite
(Mg,Mn
2+
 
)Zn(SiO
 
4
)(OH)
 
2
9.AE.30Clinohedrite
CaZn(SiO
 
4
) · H
 
2
O
9.AE.35Stringhamite
CaCu(SiO
 
4
) · H
 
2
O
9.AE.40Katoptrite
(Mn
2+
 
,Mg)
 
13
(Al,Fe
3+
 
)
 
4
Sb
5+
2
(SiO
 
4
)
 
2
O
 
20
9.AE.45Yeatmanite
Zn
 
6
Mn
2+
9
Sb
5+
2
(SiO
 
4
)
 
4
O
 
12
9.AE.50Sphaerobertrandite
Be
 
3
(SiO
 
4
)(OH)
 
2
Related Minerals - Hey's Index Grouping:

- +
14.7.1Sanbornite
Ba
 
2
(Si
 
4
O
 
10
)
14.7.2Krauskopfite
BaSi
 
2
O
 
5
 · 3H
 
2
O
14.7.3Walstromite
BaCa
 
2
(Si
 
3
O
 
9
)
14.7.4Macdonaldite
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
 · 10H
 
2
O
14.7.5Ericssonite
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
14.7.6Ericssonite-2O
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
14.7.7Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
14.7.8Andrémeyerite
Fe
2+
2
Ba(Si
 
2
O
 
7
)
14.7.9Pellyite
Ba
 
2
Ca(Fe,Mg)
 
2
Si
 
6
O
 
17
14.7.10Taikanite
Sr
 
3
BaMn
2+
2
(Si
 
4
O
 
12
)O
 
2
14.7.11Willemite
Zn
 
2
SiO
 
4
14.7.12Hemimorphite
Zn
 
4
Si
 
2
O
 
7
(OH)
 
2
 · H
 
2
O
14.7.13Zincsilite
Zn
 
3
(Si
 
4
O
 
10
)(OH)
 
2
 · 4H
 
2
O
14.7.14Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
14.7.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)Si
 
2
O
 
6
14.7.16Clinohedrite
CaZn(SiO
 
4
) · H
 
2
O
14.7.17Junitoite
CaZn
 
2
Si
 
2
O
 
7
 · H
 
2
O
14.7.18Larsenite
PbZnSiO
 
4
14.7.19Esperite
PbCa
 
2
Zn
 
3
(SiO
 
4
)
 
3
14.7.21Gerstmannite
(Mg,Mn
2+
 
)Zn(SiO
 
4
)(OH)
 
2
14.7.22Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
14.7.23Franklinfurnaceite
Ca
 
2
Fe
3+
 
Mn
2+
3
Mn
3+
 
(Zn
 
2
Si
 
2
O
 
10
)(OH)
 
8

Other Names for Hodgkinsonite

Other Languages:
German:Hodgkinsonit
Russian:Годкинсонит
Spanish:Hodgkinsonita

Other Information

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 Hodgkinsonite

Reference List:

- +
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 Hodgkinsonite

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    • Localities for Hodgkinsonite

    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
    		Palache(1935):111; Dunn(1995):Pt3:373.
    Palache(1935):110.
          • 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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