Harrisonite Mineral Data

General Harrisonite Information

Chemical Formula:

Ca(Fe++,Mg)6(PO4)2(SiO4)2

Composition:

Molecular Weight = 732.77 gm

Calcium 5.47 % Ca 7.65 % CaO

Magnesium 2.32 % Mg 3.85 % MgO

Iron 41.16 % Fe 52.95 % FeO

Silicon 7.67 % Si 16.40 % SiO₂

Phosphorus 8.45 % P 19.37 % P₂O₅

Oxygen 34.93 % O

______ ______

100.00 % 100.22 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺_5.4Mg_0.7(PO₄)₂(SiO₄)₂

Environment:

Constituent in a layered iron silicate-quartz-apatite body in gneisses, probably a shaly and phosphatic iron formation metamorphosed to the granulite facies.

IMA Status:

Approved IMA 1993 (Dana # Added)

Locality:

Arcedeckne Island, near the Boothia Peninsula, District of Franklin, Arctic Canada. Link to MinDat.org Location Data.

Name Origin:

Named for James Merritt Harrison (1915-1990), tth former director of the Canadian Geological Service.

Name Pronunciation:

Harrisonite + Pronunciation

Synonym:

ICSD 75926

IMA1991-010

PDF 46-1433

Harrisonite Image

Images:

Harrisonite

Comments: Glassy brown crystalline harrisonite grains in matrix.
Location: Arcedeckne Island, District of Franklin, Northwest Territories, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Harrisonite Crystallography

Axial Ratios:

a:c = 1:4.28969

Cell Dimensions:

a = 6.248, c = 26.802, Z = 3; V = 906.11 Den(Calc)= 4.03

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 3.119(1), 2.558(1), 1.56(0.8),2.505(0.8), 2.689(0.8), 1.903(0.6), 5(0.6),

Crystal Structure:

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Grice J D , Roberts A C , The Canadian Mineralogist , 31 (1993) p.781-785, Harrisonite, a well-ordered silico-phosphate with a layered crystal structure., Ca(Fe,Mg)6(SiO4)2(PO4)2, Locality: Arcedeckne Island, Artic Canada

Physical Properties of Harrisonite

Cleavage:

{???} Indistinct

Color:

Yellow brown, Orange brown.

Density:

4.02

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Selvage - As a reaction rim, surrounding the host mineral.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Harrisonite

Dichroism (e):

pale yellow.

Dichroism (w):

paler yellow.

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1897,KPDmeas= 0.1902,KC= 0.1929
Ncalc = 1.78

Optical Data:

Uniaxial (-), e=1.759, w=1.77, bire=0.0110.

Calculated Properties of Harrisonite

Electron Density:

Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Harrisonite =4.02 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Harrisonite= 13.79 barns/electron
U=PE_Harrisonite x rElectron Density= 53.70 barns/cc.

Radioactivity:

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

Harrisonite Classification

Dana Class:

53.02.03.01 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations

(53.02)with (SO4), (CrO4), (PO4), etc.

(53.02.03)Dana Group

53.02.03.01 Harrisonite! Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

Strunz Class:

08.AC.55 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.55 Harrisonite! Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

Other Harrisonite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Harrisonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Harrisonite here :
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Print or Cut-and-Paste your Harrisonite Specimen Label here :

Harrisonite

Ca(Fe++,Mg)6(PO4)2(SiO4)2
Dana No: 53.02.03.01 Strunz No: 08.AC.55
Locality:

Notes: