Harrisonite Mineral Data

Harrisonite Mineral Data +

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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.

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Harrisonite

Electron Density:

r_electron=3.89 gm/cc
note: r_Harrisonite=4.02 gm/cc.

Fermion Index

Fermion Index = 0.01486
Boson Index = 0.98514

Photoelectric:

PE_Harrisonite= 13.79 barns/electron
U=PE_Harrisonite x r_electron= 53.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Harrisonite is Not Radioactive

Harrisonite Classification

Dana Class:

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

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

(53.2.3)Dana Group

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

Strunz Class:

VIII/B.22-75 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.22 - Thaumasite series

VIII/B.22-10 Hatrurite Ca3SiO5 R 3m 3m

VIII/B.22-25 Poldervaartite (Ca,Mn)2SiO3(OH)2 P bca 2/m 2/m 2/m

VIII/B.22-30 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

VIII/B.22-40 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

VIII/B.22-50 Spurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-60 Paraspurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-65 Ternesite! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

VIII/B.22-70 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

VIII/B.22-75 Harrisonite Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

VIII/B.22-80 Fukalite Ca4Si2O6(CO3)(OH,F)2 Unk Ortho

VIII/B.22-90 Thaumasite Ca3Si(CO3)(SO4)(OH)6·12(H2O) P 6₃/m 6/m

VIII/B.22-100 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2·9(H2O) Unk Ortho

Other Harrisonite Information

References:

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

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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: 53.2.3.1 Strunz No: VIII/B.22-75
Locality:

Notes: