Mineralogy Database

Hodgkinsonite Mineral Data

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General Hodgkinsonite Information

Help on Chemical  Formula: Chemical Formula: MnZn2SiO4(OH)2
Help on Composition: Composition: Molecular Weight = 311.82 gm
   Manganese  17.62 %  Mn   22.75 % MnO
   Zinc       41.94 %  Zn   52.20 % ZnO
   Silicon     9.01 %  Si   19.27 % SiO2
   Hydrogen    0.65 %  H     5.78 % H2O
   Oxygen     30.79 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Zn2(SiO4)(OH)2
Help on Environment: Environment: Metamorphosed zinc-manganese deposit.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1913
Help on Locality: Locality: Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for H. H. Hodgkinson, assistant underground supervisor of Franklin mine who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Hodgkinsonite + Pronunciation Say HODGKINSONITE
Help on Synonym: Synonym: ICSD 25709
  PDF 35-554

Hodgkinsonite Image

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  Hetaerolite   Hodgkinsonite

Comments: Dark crystal of hetaerolite on hodgkinsonite.
Location: Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Comments: Pink, transparent crystal of hodgkinsonite with franklinite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Hodgkinsonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.2121:1:1.5385
Help on Cell Dimensions: Cell Dimensions: a = 11.764, b = 5.318, c = 8.182, Z = 4; beta = 95.42° V = 509.59 Den(Calc)= 4.06
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.869(1), 2.965(0.8), 11.82(0.55),

Physical Properties of Hodgkinsonite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Light pink, Orange, Reddish brown.
Help on Density: Density: 3.91
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent to opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luminescence: Luminescence: Fluorescent, Long UV=red, weak pink dull dark purple.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Hodgkinsonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1812,KPDmeas= 0.1882,KC= 0.187
Ncalc = 1.73 - 1.76
Help on Optical Data: Optical Data: Biaxial (-), a=1.72, b=1.741, g=1.746, bire=0.0260

Calculated Properties of Hodgkinsonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Hodgkinsonite =3.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHodgkinsonite = 25.90 barns/electron
U=PEHodgkinsonite x rElectron Density= 96.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hodgkinsonite is Not Radioactive

Hodgkinsonite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02)with cations in [4] and >[4] coordination
  (52.02.01)Euclase group Euclase BeAlSiO4(OH) P 21/a 2/m Clinohedrite CaZnSiO4•(H2O) Aa m Hodgkinsonite MnZn2SiO4(OH)2 P 21/c 2/m Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AE.20 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AE -Nesosilicates with additional (O,OH,F,H2O);
09.AE.20 Hodgkinsonite MnZn2SiO4(OH)2 P 21/c 2/m

Other Hodgkinsonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Hodgkinsonite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Franklin Minerals(Palache)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Minerals of Franklin and Sterling Hill
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info

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Dana No: Strunz No: 09.AE.20





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