Hodgkinsonite Mineral Data (original) (raw)

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.

Name Pronunciation:

Hodgkinsonite + Pronunciation

Synonym:

ICSD 25709

PDF 35-554

Hodgkinsonite Image

Images:

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/Io): 2.869(1), 2.965(0.8), 11.82(0.55),

Crystal Structure:

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| | Rentzeperis P J , Zeitschrift fur Kristallographie , 119 (1963) p.117-138, The crystal structure of hodgkinsonite Zn2Mn[(OH)2|SiO4], Locality: Franklin, New Jersey, Note: y(H2) corrected | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Physical Properties of Hodgkinsonite

Cleavage:

{???} Perfect

Color:

Light pink, Orange, Reddish brown.

Density:

3.91

Diaphaneity:

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:

Fluorescent, Long UV=red, weak pink dull dark purple.

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
Ncalc = 1.73 - 1.76

Optical Data:

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

Calculated Properties of Hodgkinsonite

Electron Density:

Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Hodgkinsonite =3.91 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PEHodgkinsonite = 25.90 barns/electron
U=PEHodgkinsonite x rElectron Density= 96.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hodgkinsonite is Not Radioactive

Hodgkinsonite Classification

Dana Class:

52.02.01.03 (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

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

52.02.01.02 Clinohedrite CaZnSiO4•(H2O) Aa m

52.02.01.03 Hodgkinsonite MnZn2SiO4(OH)2 P 21/c 2/m

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

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

References:

NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) 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: 52.02.01.03 Strunz No: 09.AE.20
Locality:

Notes: