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|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).|
Classification of Epidote-(Pb)
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/C.23-90|
|Nickel-Strunz 10th (pending) edition ID:||9.BG.05|
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral  and greater coordination
|Dana 8th edition ID:||58.2.1a.8|
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in  and higher coordination; single and double groups (n = 1, 2)
|Hey's CIM Ref.:||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)
|Type Locality:||Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA|
|Year of Discovery:||1899|
|Associated Minerals at type locality:|
Physical Properties of Epidote-(Pb)
|Diaphaneity (Transparency):||Transparent, Translucent, Opaque|
|Colour:||Dark brick-red (TL), greenish-brown, yellow-brown|
|Hardness (Mohs):||6 - 7|
Crystallography of Epidote-(Pb)
|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 Å³ (Calculated from Unit Cell)|
Optical Data of Epidote-(Pb)
|RI values:||nα = 1.790 nβ = 1.810 nγ = 1.830|
|2V:||Measured: 50° , Calculated: 88°|
|Maximum Birefringence:||δ = 0.040|
Chart 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)
|Essential elements:||Al, Ca, Fe, H, O, Pb, Si|
|All elements listed in formula:||Al, Ca, Fe, H, O, Pb, Si|
Relationship of Epidote-(Pb) to other Species
|Member of:||Epidote Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Epidote-(Pb)
|Health Warning:||Contains Pb.|
References for Epidote-(Pb)
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)
The 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. ? 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.