Epidote-(Pb) Mineral Data

General Epidote-(Pb) 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 - Dana # Changed from 58.2.1a.8

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.

Name Pronunciation:

Epidote-(Pb)

Synonym:

Handcockite - Renamed to Epidote-(Pb) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567.

Epidote-(Pb) Image

Images:

Click Here for Larger Epidote-(Pb) Image

Epidote-(Pb) Clinohedrite

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

Images:

Epidote-(Pb)

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:

Epidote-(Pb) Nasonite

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

Epidote-(Pb) 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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds 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 Epidote-(Pb)

Cleavage:

{001} Perfect

Color:

Brown, Brick red, Brownish red, Maroon.

Density:

Diaphaneity:

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 Epidote-(Pb)

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1966,KPDmeas= 0.2025,KC= 0.2082
Ncalc = 1.83 - 1.86

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 Epidote-(Pb)

Electron Density:

Bulk Density (Electron Density)=3.79 gm/cc
note: Specific Gravity of Epidote-(Pb) =4.00 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Epidote-(Pb)= 296.24 barns/electron
U=PE_Epidote-(Pb) x rElectron Density=1,123.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Epidote-(Pb) is Not Radioactive

Epidote-(Pb) Classification

Dana Class:

58.02.01a.03 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

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

(58.02.01a)Epidote group (Clinozoisite subgroup)

58.02.01a.01 Clinozoisite! Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.02 Epidote! Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.03 Epidote-(Pb)! (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.04 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

58.02.01a.05 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.06 Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.07 Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

58.02.01a.08 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

58.02.01a.09 Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.02.01a.10 Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.02.01a.11 Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

09.BG.05a 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.05a Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05a Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05a Epidote-(Pb) (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05a Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

09.BG.05a Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05a Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05a Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

09.BG.05a Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

09.BG.05a Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Other Epidote-(Pb) Information

References:

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

See Also:

Links to other databases for Epidote-(Pb) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Epidote-(Pb) Specimen Label here :

Epidote-(Pb)

(Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH)
Dana No: 58.02.01a.03 Strunz No: 09.BG.05a
Locality:

Notes: