Hodgkinsonite Mineral Data

Hodgkinsonite Mineral Data +

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General Hodgkinsonite Information

Chemical Formula:

MnZn2SiO4(OH)2

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

Empirical Formula:

Mn²⁺Zn₂(SiO₄)(OH)₂

Environment:

Metamorphosed zinc-manganese deposit.

IMA Status:

Valid Species (Pre-IMA) 1913

Locality:

Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for H. H. Hodgkinson, assistant underground supervisor of Franklin mine who discovered the mineral.

Synonym:

ICSD 25709

PDF 35-554

Hodgkinsonite Image

Images:

Click Here for Larger Hodgkinsonite Image

Hodgkinsonite Hetaerolite

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

Images:

Hodgkinsonite

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

Axial Ratios:

a:b:c =2.2121:1:1.5385

Cell Dimensions:

a = 11.764, b = 5.318, c = 8.182, Z = 4; beta = 95.42° V = 509.59 Den(Calc)= 4.06

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.869(1), 2.965(0.8), 11.82(0.55),

Physical Properties of Hodgkinsonite

Cleavage:

[???] Perfect

Color:

Light pink, Orange, Reddish brown.

Density:

3.91

Diaphaniety:

Translucent to subtranslucent to opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Optical Properties of Hodgkinsonite

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

Optical Data:

Biaxial (-), a=1.72, b=1.741, g=1.746, bire=0.0260

Calculated Properties of Hodgkinsonite

Electron Density:

r_electron=3.74 gm/cc
note: r_{Hodgkinsonite}=3.91 gm/cc.

Fermion Index

Fermion Index = 0.02155
Boson Index = 0.97845

Photoelectric:

PE_{Hodgkinsonite}= 25.90 barns/electron
U=PE_{Hodgkinsonite} x r_electron= 96.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hodgkinsonite is Not Radioactive

Hodgkinsonite Classification

Dana Class:

52.2.1.3. (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.2)with cations in [4] and >[4] coordination

(52.2.1)Euclase group

52.2.1.1 Euclase BeAlSiO4(OH) P 2₁/a 2/m

52.2.1.2 Clinohedrite CaZnSiO4·(H2O) Aa m

52.2.1.3. Hodgkinsonite MnZn2SiO4(OH)2 P 2₁/c 2/m

52.2.1.4 Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m

Strunz Class:

VIII/B.01-20 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.01 - Euclase series

VIII/B.01-10 Euclase BeAlSiO4(OH) P 2₁/a 2/m

VIII/B.01-20 Hodgkinsonite MnZn2SiO4(OH)2 P 2₁/c 2/m

VIII/B.01-25 Sphaerobertrandite Be3SiO4(OH)2 P 2 2

VIII/B.01-30 Beryllite Be3SiO4(OH)2·(H2O) Unk Ortho

Other Hodgkinsonite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Hodgkinsonite Specimen Label here :

Hodgkinsonite

MnZn2SiO4(OH)2
Dana No: 52.2.1.3. Strunz No: VIII/B.01-20
Locality:

Notes: