Hodgkinsonite
A valid IMA mineral species - grandfathered
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About Hodgkinsonite
Formula:
Mn2+Zn2(SiO4)(OH)2
Colour:
: Bright pink or red to reddish brown and orange, rarely yellow; black from tarnish or inclusions.
Hardness:
4½ - 5
Specific Gravity:
4.06 - 4.08
Crystal System:
Monoclinic
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.
Visit gemdat.org for Unique Identifiers
Mindat ID:
1913
Long-form identifier:
mindat:1:1:1913:8
GUID
(UUID V4):
(UUID V4):
8aaf888a-e1aa-46e1-8da7-d983699f5204
IMA Classification of Hodgkinsonite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Zn2Mn2+(SiO4)(OH)2
Classification of Hodgkinsonite
9.AE.20
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
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
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
14.7.20
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Hgk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hodgkinsonite
Transparency:
Transparent, Translucent
Colour:
: Bright pink or red to reddish brown and orange, rarely yellow; black from tarnish or inclusions.
Hardness:
4½ - 5 on Mohs scale
Cleavage:
Perfect
{011}
{011}
Density:
4.06 - 4.08 g/cm3 (Measured) 4.07 g/cm3 (Calculated)
Optical Data of Hodgkinsonite
Type:
Biaxial (-)
RI values:
nα = 1.720 - 1.724 nβ = 1.741 - 1.742 nγ = 1.746
2V:
Measured: 50° to 60°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v moderate
Pleochroism:
Weak
Comments:
In shades of lavender and pale purple.
Chemistry of Hodgkinsonite
Mindat Formula:
Mn2+Zn2(SiO4)(OH)2
Common Impurities:
Fe,Mg,Ca
Crystallography of Hodgkinsonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 11.761(2) Å, b = 5.316(2) Å, c = 8.171(2) Å
β = 95.25(8)°
β = 95.25(8)°
Ratio:
a:b:c = 2.212 : 1 : 1.537
Unit Cell V:
508.72 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010606 | Hodgkinsonite | Rentzeperis P J (1963) The crystal structure of hodgkinsonite Zn2Mn[(OH)2|SiO4] Zeitschrift fur Kristallographie 119 117-138 |  | 1963 | Franklin, New Jersey | 0 | 293 |
| 0015595 | Hodgkinsonite | Solov'eva L P, Belov N V (1963) Crystal structure of hodgkinsonite Zn2Mn[SiO4](OH)2 Soviet Physics Doklady 8 867-870 | 1963 | Franklin, New Jersey | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.864 Å | (100) |
| 2.957 Å | (90) |
| 1.547 Å | (85) |
| 2.567 Å | (65) |
| 1.412 Å | (65) |
| 2.115 Å | (60) |
| 1.594 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Hodgkinsonite
Co-Type Localities:
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 89875, 89880, 89881; National Museum of Natural History, Washington, D.C., USA, 87231.
Associated Minerals at Type Locality:
Reference:
Palache, C. and Schaller, W.T. (1913): Hodgkinsonite, a new mineral from Franklin Furnace, New Jersey. J. Wash. Acad. Sci., 3(19), 474-478.
Other Language Names for Hodgkinsonite
Common Associates
Associated Minerals Based on Photo Data:
| 35 photos of Hodgkinsonite associated with Zincite | ZnO |
| 32 photos of Hodgkinsonite associated with Hetaerolite | ZnMn2O4 |
| 31 photos of Hodgkinsonite associated with Franklinite | Zn2+Fe3+2O4 |
| 31 photos of Hodgkinsonite associated with Willemite | Zn2SiO4 |
| 14 photos of Hodgkinsonite associated with Chlorophoenicite | (Mn,Mg)3Zn2(AsO4)(OH,O)6 |
| 11 photos of Hodgkinsonite associated with Copper | Cu |
| 8 photos of Hodgkinsonite associated with Franklinfurnaceite | Ca2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8 |
| 8 photos of Hodgkinsonite associated with Baryte | BaSO4 |
| 6 photos of Hodgkinsonite associated with Fluorite | CaF2 |
| 5 photos of Hodgkinsonite associated with Sussexite | Mn2+BO2(OH) |
Related Minerals - Strunz-mindat Grouping
| 9.AE.05 | Beryllite | Be3(SiO4)(OH)2 · H2O |
| 9.AE.10 | Euclase | BeAl(SiO4)(OH) |
| 9.AE.15 | Sverigeite | NaMnMgSnBe2(SiO4)3(OH) |
| 9.AE.25 | Gerstmannite | MnMgZn(SiO4)(OH)2 |
| 9.AE.30 | Clinohedrite | CaZn(SiO4) · H2O |
| 9.AE.35 | Stringhamite | CaCu(SiO4) · H2O |
| 9.AE.40 | Katoptrite | (Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20 |
| 9.AE.45 | Yeatmanite | Zn6Mn2+9Sb5+2(SiO4)4O12 |
| 9.AE.50 | Sphaerobertrandite | Be3(SiO4)(OH)2 |
Fluorescence of Hodgkinsonite
weak pinkish red in LW UV.
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.
Internet Links for Hodgkinsonite
mindat.org URL:
https://www.mindat.org/min-1913.html
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References for Hodgkinsonite
Reference List:
Palache, C., Schaller, W. T. (1913) Hodgkinsonite, a new mineral from Franklin Furnace, New Jersey. Journal of the Washington Academy of Sciences, 3 (19) 474-478
Roberts, W. M. B., Quodling, F. M. (1962) X-ray, optical, and morphological observations on hodgkinsonite from Franklin Furnace. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (259) 343-346 doi:10.1180/minmag.1962.033.259.08
Localities for Hodgkinsonite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Palache et al. (1913) +3 other references |
| Palache (1935) | |
| FOMS Millsite Committee (1986) | |
| Cook (1973) +2 other references |
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Franklin Mine, Franklin, Sussex County, New Jersey, USA