Hancockite
A valid IMA mineral species - grandfathered
This page is currently not sponsored. Click here to sponsor this page.
About Hancockite
Elwood P. Hancock
Formula:
(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)
Colour:
Dark brick-red (TL), greenish-brown, yellow-brown
Lustre:
Vitreous, Dull
Hardness:
6 - 7
Crystal System:
Monoclinic
Member of:
Name:
Originally named 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, and name restored to Hancockite by the IMA in 2015.
Co-Type Localities:
Isostructural with:
This page provides mineralogical data about Hancockite.
Unique Identifiers
Mindat ID:
1814
Long-form identifier:
mindat:1:1:1814:8
Similar Names
| Haycockite | A valid IMA mineral species | Cu4Fe5S8 |
IMA Classification of Hancockite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaPb2+Fe3+Al2(Si2O7)(SiO4)O(OH)
First published:
1899
Classification of Hancockite
9.BG.05a
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
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)
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
16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hnc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hancockite
Vitreous, Dull
Transparency:
Transparent, Translucent, Opaque
Colour:
Dark brick-red (TL), greenish-brown, yellow-brown
Hardness:
6 - 7 on Mohs scale
Optical Data of Hancockite
Type:
Biaxial (-)
RI values:
nα = 1.79 nβ = 1.81 nγ = 1.83
2V:
Measured: 50° , Calculated: 88°
Max. Birefringence:
δ = 0.040
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v perceptible
Chemistry of Hancockite
Mindat Formula:
(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)
Element Weights:
Common Impurities:
Ca,Sr,Fe,Ti,Mn,Mg,Ba
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| SiO2 | 28.81 % | 27.15 % |
| Al2O3 | 14.39 % | 16.27 % |
| Fe2O3* | 14.09 % | 11.42 % |
| Mn2O3* | 1.78 % | 0.19 % |
| MnO* | 0.46 % | |
| ZnO | 0.08 % | |
| MgO | 0.05 % | 0.05 % |
| CaO | 8.78 % | 8.93 % |
| SrO | 4.53 % | 0.14 % |
| BaO | 0.37 % | 0.22 % |
| PbO | 24.13 % | 32.98 % |
| H2O (by stoichiometry) | 1.44 % | 1.38 % |
| P2O5 | 0.01 % | 0.01 % |
| TiO2 | 0.03 % | 0.12 % |
| Ga2O3 | 0.01 % | |
| Na2O | 0.01 % | 0.01 % |
| NiO | 0.01 % | |
| K2O | 0.01 % | |
| Total: | 98.97 % | 98.89 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Ca0.96Mn2+0.04)(Pb0.68Sr0.27Ca0.02Ba0.01)[(Al0.76Fe3+0.26)Al1.00(Fe3+0.85Mn3+0.14Mg0.01Zn0.01)]O[Si2.00O7][Si0.99O4](OH) |
| 2 | Ca1.00(Pb0.96Ca0.02Sr0.01Ba0.01)[Al0.98Al1.00(Fe3+0.93Al0.04Mn3+0.02Mg0.01Ti0.01)]O[Si1.94Al0.06O7][Si1.00O4](OH) |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Franklin Mine, Franklin, Sussex County, New Jersey, USA | occurs as high-z rims in complexly zoned crystals of (Sr+Pb)-bearing epidote (cores) to Pb-bearing epidote-(Sr) and Sr-bearing hancockite (near rims and rims), intergrown with barite, within massive epidote/hancockite, andradite, and franklinite rock. Hendricksite is also present. Measured by EPMA. *All Fe assumed to be Fe3+; Mn3+ and Mn2+ calculated from charge balance. H2O calculated by stoichiometry. | |
| 2 | Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden | found in a sample labeled "margarosanite", however no margarosanite was found. Scattered rounded to blocky greenish-yellow (in thin section) crystals associated with abundant aegirine-augite and hyalophane/celsian feldspar; the thin section was not fully characterized due to time limitations, and additional minor minerals are present. Analysis by EPMA; *Fe is assumed to be Fe3+ before Mn is charge balanced between Mn3+ and Mn2+. H2O calculated by stoichiometry. |
Crystallography of Hancockite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 8.9496(3) Å, b = 5.6474(2) Å, c = 10.2724(3) Å
β = 114.362(1)°
β = 114.362(1)°
Ratio:
a:b:c = 1.585 : 1 : 1.819
Unit Cell V:
472.96 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000228 | Hancockite | Dollase W A (1971) Refinement of the crystal structures of epidote, allanite and hancockite American Mineralogist 56 447-464 |  | 1971 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.91 Å | (100) |
| 3.49 Å | (50) |
| 2.60 Å | (50) |
| 2.81 Å | (40) |
| 2.71 Å | (40) |
| 2.18 Å | (40) |
| 1.90 Å | (40) |
Comments:
Franklin, New Jersey, USA. ICDD 17-212.
Type Occurrence of Hancockite
Co-Type Localities:
General Appearance of Type Material:
Massive and in cellular masses. Very small, lath-shaped crystals, up to 0.5 mm in length and 0.15 mm in width.
Place of Conservation of Type Material:
Yale University, New Haven, Connecticut, USA, number 2.4751.
Geological Setting of Type Material:
Metamorphosed stratiform zinc deposit.
Associated Minerals at Type Locality:
Synonyms of Hancockite
Other Language Names for Hancockite
Dutch:Hancockiet
German:Hancockit
Epidot-(Pb)
Epidot-(Pb)
Russian:Эпидот-(Pb)
Simplified Chinese:锶帘石
Spanish:Hancockita
Relationship of Hancockite to other Species
Member of:
Other Members of Epidote Group:
| Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Epidote-(Sr) | (CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Heflikite | (CaCa)(AlAlSc)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Mukhinite | (CaCa)(AlAlV3+)O[Si2O7][SiO4](OH) | Mon. |
| Niigataite | (CaSr)(AlAlAl)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Piemontite-(Pb) | (CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Piemontite-(Sr) | (CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Tweddillite | (CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| 'Unnamed (Fe3+ analogue of Piemontite-(Pb))' | (CaPb)(Fe3+AlMn3+)O[Si2O7][SiO4](OH) | |
| 'Unnamed (Fe3+-analogue of Piemontite)' | (CaCa)(Fe3+AlMn3+)O[Si2O7][SiO4](OH) | |
| 'Unnamed (Fe3+-analogue of Piemontite-(Sr))' | (CaSr)(Fe3+AlMn3+)O[Si2O7][SiO4](OH) | |
| 'Unnamed (Ga-analogue of Epidote)' | (CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH) |
Common Associates
Associations Based on Photo Data:
| 51 photos of Hancockite associated with Hendricksite | KZn3(Si3Al)O10(OH)2 |
| 47 photos of Hancockite associated with Axinite-(Mn) | Ca2Mn2+Al2BSi4O15(OH) |
| 43 photos of Hancockite associated with Willemite | Zn2SiO4 |
| 35 photos of Hancockite associated with Andradite | Ca3Fe3+2(SiO4)3 |
| 35 photos of Hancockite associated with Clinohedrite | CaZn(SiO4) · H2O |
| 19 photos of Hancockite associated with Xonotlite | Ca6(Si6O17)(OH)2 |
| 18 photos of Hancockite associated with Franklinite | Zn2+Fe3+2O4 |
| 17 photos of Hancockite associated with Prehnite | Ca2Al2Si3O10(OH)2 |
| 16 photos of Hancockite associated with Charlesite | Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O |
| 16 photos of Hancockite associated with Ganophyllite | (K,Na)xMn2+6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) |
Related Minerals - Strunz-mindat Grouping
| 9.BG. | Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 9.BG. | Alnaperbøeite-(Ce) | Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2 |
| 9.BG. | Zilbermintsite-(La) | (CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3 |
| 9.BG. | Heflikite | (CaCa)(AlAlSc)O[Si2O7][SiO4](OH) |
| 9.BG. | Magnesiovesuvianite | Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG. | Zoisite-(Pb) | (CaPb)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG. | Shuiskite-(Cr) | Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O |
| 9.BG. | Radekškodaite Group | |
| 9.BG.05 | Dissakisite-(La) | (CaLa)(AlAlMg)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Manganiandrosite-(Ce) | (Mn2+Ce)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Dissakisite-(Ce) | (CaCe)(AlAlMg)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Sm) | (CaSm)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Dollaseite-(Ce) | (CaCe)(MgAlMg)F[Si2O7][SiO4](OH) |
| 9.BG.05a v | 'Unnamed (Ga-analogue of Epidote)' | (CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Epidote-(Sr) | (CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Vanadoandrosite-(Ce) | (Mn2+Ce)(V3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Vanadoallanite-(La) | (CaLa)(V3+AlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | 'Unnamed (Mg-analogue of Ferriallanite-(Ce))' | (CaCe)(Fe3+AlMg)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriallanite-(La) | (CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Uedaite-(Ce) | (Mn2+Ce)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Tweddillite | (CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Åskagenite-(Nd) | (Mn2+Nd)(AlAlFe3+)O[Si2O7][SiO4]O |
| 9.BG.05 | Piemontite-(Pb) | (CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(La) | (CaLa)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Y) | (CaY)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Akasakaite-(Ce) | (CaCe)(AlAlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Manganiandrosite-(La) | (Mn2+La)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Akasakaite-(La) | (CaLa)(AlAlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Vanadoakasakaite-(La) | (CaLa)(V3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Khristovite-(Ce) | (CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriakasakaite-(La) | (CaLa)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Ferriandrosite-(La) | (Mn2+La)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | 'Androsite-(Ce)' | (Mn2+Ce)(AlAlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Vielleaureite-(Ce) | Mn2+Ce(MgAlMn2+)(Si2O7)(SiO4)F(OH) |
| 9.BG.05 | Ferriandrosite-(Ce) | (Mn2+Ce)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriallanite-(Ce) | (CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | 'Unnamed (Mn3+-analogue of Ferriakasakaite-(Ce))' | (CaCe)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Vanadoakasakaite-(Ce) | (CaCe)(V3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Piemontite-(Sr) | (CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Niigataite | (CaSr)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriakasakaite-(Ce) | (CaCe)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Nd) | (CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | 'UM1989-32-SiO:AlCaFeHREE' | (Ca0.5◻0.5REE)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Mukhinite | (CaCa)(AlAlV3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Manganiakasakaite-(La) | (CaLa)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.10 | Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG.15 | Macfallite | Ca2Mn3+3(SiO4)(Si2O7)(OH)3 |
| 9.BG.15 | Sursassite | Mn2+2Al3(SiO4)(Si2O7)(OH)3 |
| 9.BG.20 | Pumpellyite-(Al) | Ca2AlAl2[Si2O6OH][SiO4](OH)2O |
| 9.BG.20 | Shuiskite-(Mg) | Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Julgoldite-(Fe2+) | Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Okhotskite | Ca2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Julgoldite-(Mg) | Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Poppiite | Ca2V3+V3+2[Si2O6OH][SiO4](OH)2O |
| 9.BG.20 | Julgoldite-(Fe3+) | Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O |
| 9.BG.20 | Pumpellyite-(Fe2+) | Ca2Fe2+Al2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Pumpellyite-(Fe3+) | Ca2Fe3+Al2[Si2O6OH][SiO4](OH)2O |
| 9.BG.20 | Pumpellyite-(Mg) | Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.25 | Ganomalite | Pb9Ca5Mn(Si2O7)4(SiO4)O |
| 9.BG.25 | Wayneburnhamite | Pb9Ca6(Si2O7)3(SiO4)3 |
| 9.BG.30 | Rustumite | Ca10(Si2O7)2(SiO4)(OH)2Cl2 |
| 9.BG.35 | Modraite | Ca19Fe2+Al4(Al6Fe2+2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG.35 | Fluorvesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9 |
| 9.BG.35 | Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 9.BG.35 | Milanriederite | (Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG.35 | Manaevite-(Ce) | (Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9 |
| 9.BG.35 | Hongheite | Ca19Fe2+Al4(Fe3+,Mg)8(◻4)B[Si2O7]4[(SiO4)10]O(OH,O)9 |
| 9.BG.35 | Wiluite | Ca19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9 |
| 9.BG.35 | Cyprine | Ca19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG.35 | Manganvesuvianite | Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 9.BG.40 | Vyuntspakhkite-(Y) | (Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7 |
| 9.BG.45 | Dellaite | Ca6Si3O11(OH)2 |
| 9.BG.50 | Ferriperbøeite-(Ce) | CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Perbøeite-(La) | CaLa3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Perbøeite-(Ce) | CaCe3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Gatelite-(Ce) | CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Ferriperbøeite-(La) | CaLa3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.55 | Västmanlandite-(Ce) | CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2 |
| 9.BG.60 | Radekškodaite-(La) | (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 |
| 9.BG.60 | Radekškodaite-(Ce) | (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 |
Other Information
Thermal Behaviour:
Before the blowpipe, fuses with intumescence at 3 to a black, slightly maguetic globule. The globule becomes more strongly magnetic if heated on charcoal. With sodium carbonate on charcoal a coating of lead oxide is obtained. Reacts for manganese with the sodium carbonate bead in an oxidizing flame.
In the closed tube, at a high temperature, a little water is given off.
In the closed tube, at a high temperature, a little water is given off.
Notes:
Insoluble in hydrochloric acid, but after fusion it dissolves and yields gelatinous silica upon evaporation.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Hancockite
mindat.org URL:
https://www.mindat.org/min-1814.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Hancockite
Reference List:
Palache, Charles (1935) The minerals of Franklin and Sterling Hill, Sussex County, New Jersey. Professional Paper 180. US Geological Survey 135 pp. doi:10.3133/pp180
Dollase, W. A. (1971) Refinement of the crystal structures of epidote, allanite, and hancockite. American Mineralogist, 56 (3-4) 447-464
Dunn, Pete J. (1985) The lead silicates from Franklin, New Jersey: occurrence and composition. Mineralogical Magazine, 49 (354) 721-727 doi:10.1180/minmag.1985.049.354.12
Holtstam, D., Langhof, J. (1994) Hancockite from Jakobsberg, Filipstad, Sweden: the second world occurrence. Mineralogical Magazine, 58 (390) 172-174 doi:10.1180/minmag.1994.058.390.18
Armbruster, Thomas, Bonazzi, Paola, Akasaka, Masahide, Bermanec, Vladimir, Chopin, Christian, Gieré, Reto, Heuss-Assbichler, Soraya, Liebscher, Axel, Menchetti, Silvio, Pan, Yuanming, Pasero, Marco (2006) Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy, 18 (5) 551-567 doi:10.1127/0935-1221/2006/0018-0551
Localities for Hancockite
Showing 10 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
North Macedonia | |
| Geologia Croatica 51 (1998) |
| Jančev et al. (2017) |
| Chukanov et al. (2015) | |
Norway | |
| Neumann (1985) +2 other references |
Sweden | |
| Christy et al. (2005) |
| Holtstam et al. (1994) |
USA (TL) | |
| Palache (1935) +2 other references |
| King (n.d.) | |
| King (n.d.) +3 other references | |
| Penfield et al. (1899) +1 other reference |
Quick NavTopAbout HancockiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Chemical AnalysisCrystallography Crystal StructureX-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Franklin Mine, Franklin, Sussex County, New Jersey, USA