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|System:||Monoclinic||Hardness:||4½ - 5|
|Name:||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 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  coordination
|Dana 8th edition ID:||126.96.36.199|
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
2 : Insular SiO4 Groups and O, OH, F, and H2O with cations in  and > 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 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
|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 Å³ (Calculated from Unit Cell)|
Optical Data of Hodgkinsonite
|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.
|Dispersion:||r < v moderate|
Chemical Properties of Hodgkinsonite
|Essential elements:||H, Mn, O, Si, Zn|
|All elements listed in formula:||H, Mn, O, Si, Zn|
Relationship of Hodgkinsonite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Hodgkinsonite
|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
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
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.
(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.