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Epidote-(Pb)

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Formula:
{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
System:
Monoclinic
Colour:
Dark brick-red (TL), ...
Hardness:
6 - 7
Name:
Originally named Hancockite in 1899 by Samuel L. Penfield and Charles H. Warren in honor of Elwood P. Hancock [May, 1835 New Jersey, USA - November 5, 1916 Burlington, Burlington County, New Jersey, USA], a landscape artist. Hancock started mineral collecting about 1854 and his collection was bequeathed to Harvard University in 1916. Renamed by the Epidote Subcommittee of the CNMMN in 2006 to Epidote-(Pb).
Isostructural with:

Classification of Epidote-(Pb)

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.1a.8

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
16.14.16

16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb
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Type Occurrence of Epidote-(Pb)

Year of Discovery:
1899
Associated Minerals at Type Locality:

Physical Properties of Epidote-(Pb)

Vitreous, Dull
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Colour:
Dark brick-red (TL), greenish-brown, yellow-brown
Hardness (Mohs):
6 - 7

Crystallography of Epidote-(Pb)

Crystal System:
Monoclinic
Cell Parameters:
a = 9.03Å, b = 5.62Å, c = 10.29Å
β = 115.93°
Ratio:
a:b:c = 1.607 : 1 : 1.831
Unit Cell Volume:
V 469.63 ų (Calculated from Unit Cell)

Crystal Structure

Structure
Reference
Dollase W A (1971) Refinement of the crystal structures of epidote, allanite and hancockite. American Mineralogist 56:447-464.

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More Crystal Structures
Click here to view more crystal structures at the American Mineralogist Crystal Structure Database

Optical Data of Epidote-(Pb)

Type:
Biaxial (-)
RI values:
nα = 1.790 nβ = 1.810 nγ = 1.830
2V:
Measured: 50° , Calculated: 88°
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v perceptible

Chemical Properties of Epidote-(Pb)

Formula:
{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Essential elements:
All elements listed in formula:
Common Impurities:
Ca,Sr,Fe,Ti,Mn,Mg,Ba

Relationship of Epidote-(Pb) to other Species

Other Members of Group:
Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Clinozoisite-(Sr){CaSr}{Al3}(Si2O7)(SiO4)O(OH)
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Hancockite{CaPb}{Al2(Fe3+,Mn3+)}(Si2O7)(SiO4)O(OH)
Manganipiemontite-(Sr){CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Piemontite-(Pb)CaPbAl2Mn3+[Si2O7][SiO4]O(OH)
Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganipiemontite-(Sr){CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Clinozoisite-(Sr){CaSr}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganiandrosite-(Ce){(Mn2+,Ca)(Ce,REE)}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2
9.BG.10Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.15MacfalliteCa2(Mn3+,Al)3(Si2O7)(SiO4)(OH)3
9.BG.15SursassiteMn22+Al3(Si2O7)(SiO4)(OH)3
9.BG.20Julgoldite-(Fe2+)Ca2(Fe2+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20OkhotskiteCa2(Mn2+,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg,Fe2+)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Mn2+)Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20ShuiskiteCa2(Mg,Al)(Cr,Al)2(Si2O7)(SiO4)(OH)2 · 2H2O
9.BG.20Julgoldite-(Fe3+)Ca2(Fe3+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Al)Ca2(Al,Fe2+,Mg)Al2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Julgoldite-(Mg)Ca2(Mg,Fe2+)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6(Si2O7)(SiO4)(OH)2
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2
9.BG.55Västmanlandite-(Ce)Ca(Ce,La)3Al2Mg2(Si2O7)(SiO4)3(OH)2F
16.14.1ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
16.14.2Vinogradovite(Na,Ca,K)4Ti4AlSi6O23(OH) · 2H2O
16.14.3RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]
16.14.4Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
16.14.5Ferro-kaersutite{Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
16.14.6JonesiteBa4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2O
16.14.7Lourenswalsite(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12
16.14.8Labuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O
16.14.9KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
16.14.10EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
16.14.11Carlosturanite(Mg,Fe,Ti)21(Si,Al)12O28(OH)34•H2O
16.14.12EakeriteCa2SnAl2Si6O18(OH)2 · 2H2O
16.14.13PlumalsitePb4Al2(SiO3)7
16.14.14WickenburgiteCaPb3Al2Si10O24(OH)6
16.14.15MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
16.14.17BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
16.14.18MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6

Other Names for Epidote-(Pb)

Name in Other Languages:
Simplified Chinese:锶帘石
Spanish:Hancockita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Epidote-(Pb)

Reference List:
Palache, C. (1935), The Minerals of Franklin and Sterling Hill, Sussex County, New Jersey. USGS Profesional Paper 180: 98.

Dollase, W.A. (1971), Refinement of the crystal structures of epidote, allanite and hancockite: American Mineralogist: 56: 447-464.

Frondel, C. (1972): The minerals of Franklin and Sterling Hill - a checklist.

Mineralogical Magazine (1985): 49: 721.

Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world’s most magnificent mineral deposits, Part3: 406.

Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec, V., Chopin, C., Gieré R., Heuss-Assbichler, S., Liebscher, A., Menchetti, S., Pan, Y., Pasero, M. (2006): Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy, 18, 551-567.

Internet Links for Epidote-(Pb)

Localities for Epidote-(Pb)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Norway
 
  • Nordland
    • Hinnøya
      • Lødingen
Selbekk R.S. (2010): Norges mineraler. En revidert utgave av Norges mineraler (Neumann 1985). Tapir-NGU-NHM. 552p (p.349) Henrich Neumann(1985): Norges Mineraler, Universitetsforlaget D. Holtstam and J. Langhof (1994) Hancockite from Jakobsberg, Filipstad, Sweden: the second world occurrence , MINERALOGICAL MAGAZINE, , VOL. 58, PP. 172-174
Republic of Macedonia
 
  • Veles
Geologia Croatica 51 (1998) 23-26 [http://www.geologia-croatica.hr/abstract/gc-51-1-04.html]
Sweden
 
  • Värmland
    • Filipstad
Christy, A.G. & Gatedal, K. (2005): Extremely Pb-rich rock-forming silicates including a beryllian scapolite and associated minerals in a skarn from Långban, Värmland, Sweden. Mineralogical Magazine, 69, 995-1018.
      • Nordmark district
        • Jakobsberg ore field
Kjell Gatedal; Mineralogical Magazine (1994) 58 (1), 172-174
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Frondel, C.: The minerals of Franklin and Sterling Hill - a checklist (1972); Palache(1935):98; Dunn(1995):Pt3:406.
Van King
Van King; Chester S. Lemanski, Jr.; Ronald DeBlois; Steven Misiur.
palache (1935)
Mineral and/or Locality  
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