Hancockite Mineral Data

Hancockite Mineral Data +

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General Hancockite Information

Chemical Formula:

(Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH)

Composition:

Molecular Weight = 583.18 gm

Strontium 3.00 % Sr 3.55 % SrO

Calcium 8.25 % Ca 11.54 % CaO

Manganese 2.83 % Mn 2.43 % MnO / 1.35 % Mn₂O₃

Aluminum 9.25 % Al 17.48 % Al₂O₃

Iron 8.62 % Fe 12.32 % Fe₂O₃

Silicon 14.45 % Si 30.91 % SiO₂

Hydrogen 0.17 % H 1.54 % H₂O

Lead 17.76 % Pb 19.14 % PbO

Oxygen 35.67 % O

______ ______

100.00 % 100.27 % = TOTAL OXIDE

Empirical Formula:

Ca_1.2Pb_0.5Sr_0.2Mn²⁺_0.2Al₂Fe³⁺_0.9Mn³⁺_0.1(SiO₄)(Si₂O₇)O(OH)

Environment:

Metamorphosed zinc deposit.

IMA Status:

Valid Species (Pre-IMA) 1899

Locality:

Franklin, New Jersey Link to MinDat.org Location Data.

Name Origin:

Named for Elwood P. Hancock (1836-1916), of Berlinton, New Jersey, USA, collector of minerals from Franklin.

Synonym:

ICSD 15191

PDF 17-212

Hancockite Image

Images:

Hancockite Clinohedrite

Comments: Clear crystals of clinohedrite on hancockite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Hancockite

Comments: Reddish brown prisms of hancockite on matrix.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Hancockite Nasonite

Comments: Colorless, transparent hexagonal prism of Nasonite on reddish brown hancockite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Hancockite Crystallography

Axial Ratios:

a:b:c =1.6067:1:1.8309

Cell Dimensions:

a = 9.03, b = 5.62, c = 10.29, Z = 2; beta = 115.9° V = 469.75 Den(Calc)= 4.12

Crystal System:

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

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

By Intensity(I/I_o): 2.91(1), 2.6(0.5), 3.49(0.5),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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I - Data Info
A - Atoms On/Off
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Dollase W A , American Mineralogist , 56 (1971) p.447-464, Refinement of the crystal structures of epidote, allanite and hancockite

Physical Properties of Hancockite

Cleavage:

[001] Perfect

Color:

Brown, Brick red, Brownish red, Maroon.

Density:

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

6-7 - Orthoclase-Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Streak:

brownish white

Optical Properties of Hancockite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1966,KPDmeas= 0.2025,KC= 0.2035

Optical Data:

Biaxial (-), a=1.79, b=1.81, g=1.83, bire=0.0400, 2V(Calc)=88, 2V(Meas)=50. Dispersion r > v perceptible.

Pleochroism (x):

colorless, pale rose, or greenish yellow.

Pleochroism (y):

pale brownish yellow, yellow, or yellow.

Pleochroism (z):

pale rose, greenish yellow, or green.

Calculated Properties of Hancockite

Electron Density:

r_electron=3.79 gm/cc
note: r_Hancockite=4.00 gm/cc.

Fermion Index

Fermion Index = 0.05022
Boson Index = 0.94978

Photoelectric:

PE_Hancockite= 296.24 barns/electron
U=PE_Hancockite x r_electron=1,123.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hancockite is Not Radioactive

Hancockite Classification

Dana Class:

58.2.1a.8 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.2.1a)Epidote group (Epidote subgroup)

58.2.1a.1 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.2 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.3 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.4 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.5 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

58.2.1a.6 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

58.2.1a.7 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.8 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.9 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

58.2.1a.10 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.11 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.12 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.13 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.14 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

58.2.1a.15 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

58.2.1a.16 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

58.2.1a.17 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.18 Vastmanlandite-(Ce)! Ce3CaMg2Al2Si5O19(OH)2F P 2₁/m 2/m

58.2.1a.19 IMA2002-049! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.20 Dissakisite-(La)! (Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

58.2.1a.22 IMA2004-015! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

VIII/C.23-90 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.23 - Epidote group

VIII/C.23-10 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-20 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-30 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-40 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-43 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

VIII/C.23-45 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

VIII/C.23-50 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-52 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-55 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

VIII/C.23-58 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

VIII/C.23-60 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-65 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-80 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-85a Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

VIII/C.23-85 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

VIII/C.23-87 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

VIII/C.23-90 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-100 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m

Other Hancockite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Hancockite

(Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH)
Dana No: 58.2.1a.8 Strunz No: VIII/C.23-90
Locality:

Notes: