Hancockite (original) (raw)
A valid IMA mineral species - grandfathered
About HancockiteHide
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Formula:
(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)
Colour:
Dark brick-red (TL), greenish-brown, yellow-brown
Crystal System:
Monoclinic
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.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1814:8
8ba745cf-0c16-470f-8839-b497d8f7686a
IMA Classification of HancockiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaPb(Al2Fe3+)[Si2O7][SiO4]O(OH)
Classification of HancockiteHide
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9.BG.05a
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
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| 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 HancockiteHide
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Transparency:
Transparent, Translucent, Opaque
Colour:
Dark brick-red (TL), greenish-brown, yellow-brown
Optical Data of HancockiteHide
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RI values:
_n_α = 1.790 _n_β = 1.810 _n_γ = 1.830
2V:
Measured: 50° , Calculated: 88°
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
r > v perceptible
Chemistry of HancockiteHide
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Mindat Formula:
(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)
Common Impurities:
Ca,Sr,Fe,Ti,Mn,Mg,Ba
Chemical AnalysisHide
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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 | Frank K. Mazdab collectionsample FKM-88; https://www.rockptx.com/fkm-76-to-fkm-100/#FKM-88 | 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 | Frank K. Mazdab collectionsample FKM-437; https://www.rockptx.com/fkm-426-to-fkm-450/#FKM-437 | 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 HancockiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.9496 (3) Å, b = 5.6474(2) Å, c = 10.2724(3) Å
β = 114.362(1)°
Ratio:
a:b:c = 1.585 : 1 : 1.819
Unit Cell V:
472.96 ų (Calculated from Unit Cell)
Crystal StructureHide
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| 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 DiffractionHide
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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 HancockiteHide
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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 HancockiteHide
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Other Language Names for HancockiteHide
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Relationship of Hancockite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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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.
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 HancockiteHide
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References for HancockiteHide
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Reference List:
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
Perchiazzi, Natale, Mauro, Daniela, Vignola, Pietro, Zaccarini, Federica, Eldjarn, Knut (2021) Zoisite-(Pb), a New Orthorhombic Epidote-Related Mineral from the Jakobsberg Mine, Värmland, Sweden, and Its Relationships with Hancockite. Minerals, 12 (1) 51 doi:10.3390/min12010051
Localities for HancockiteHide
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This 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.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| North Macedonia | |
|---|---|
| Čaška Municipality ⓘ Nežilovo | Geologia Croatica 51 (1998) |
| Jakupica Mountains Babuna Valley ⓘ Kalugeri Hill | Jančev et al. (2017) |
| ⓘ Mixed Series formation | Chukanov et al. (2015) |
| Norway | |
| Nordland Lødingen Vestpolltind ⓘ |
Neumann (1985) +2 other references |
| Sweden | |
| Värmland County Filipstad Långban Ore District ⓘ Långban Mine | Christy et al. (2005) |
| Nordmark mining district Jakobsberg ore field ⓘ Jakobsberg Mine | Holtstam et al. (1994) |
| USA (TL) | |
| New Jersey Sussex County Franklin ⓘ Franklin Mine (TL) |
Palache (1935) +2 other references |
| ⓘ Buckwheat dump mineral collecting site | King (n.d.) |
| ⓘ Mill site dump | King (n.d.) +3 other references |
| ⓘ Parker shaft (TL) | Penfield et al. (1899) +1 other reference |