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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+Ce}{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
Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, 278 pp.; Selbekk R.S. (2010): Norges mineraler. En revidert utgave av Norges mineraler (Neumann 1985). Tapir-NGU-NHM. 552p (p.349); Holtstam, D. & Langhof, J. (1994): Hancockite from Jakobsberg, Filipstad, Sweden: the second world occurrence. Mineralogical Magazine. 58, 172-174
Republic of Macedonia
 
  • Veles
Geologia Croatica 51 (1998) 23-26 [http://www.geologia-croatica.hr/abstract/gc-51-1-04.html]
      • Jakupica Mts
        • Babuna Valley
Chukanov, Nikita V., Jančev, Simeon., Pekov, Igor V. (2015): The association of Oxygen-bearing minerals of the chalcophile elements in the orogenetic zone related to the “mixed series” complex near Nežilovo, Republic of Macedonia. Macedonian Journal of Chemistry and Chemical Engineering, Vol. 34, No. 1, pp. 115–124
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; Holtstam, D. & Langhof, J. (1994): Hancockite from Jakobsberg, Filipstad, Sweden: the second world occurrence. Mineralogical Magazine. 58, 172-174
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Van King
Frondel, C.: The minerals of Franklin and Sterling Hill - a checklist (1972); Palache(1935):98; Dunn(1995):Pt3:406.
palache (1935)
Van King; Chester S. Lemanski, Jr.; Ronald DeBlois; Steven Misiur.
Mineral and/or Locality  
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