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Ham and Weeks Mine (Weeks Feldspar Quarry; Ham-Weeks pegmatite), Wakefield, Carroll Co., New Hampshire, USA

This page kindly sponsored by Maine Mineralogical and Geological Society
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Latitude & Longitude (WGS84): 43° 40' 14'' North , 71° 0' 29'' West
Latitude & Longitude (decimal): 43.67056,-71.00806
GeoHash:G#: drv82jvx2
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate


Granite pegmatite. Opened in 1877. Mined for mica, feldspar, and beryl.

The Ham and Weeks Educational and Recreational Area is currently operated by the Maine Mineralogical and Geological Society (MMGS). The site is leased by MMGS, and access is limited to MMGS members. According to the MMGS website:

"Ham and Weeks Mine was first developed by the Mineral Hill Mining Corporation, formed August 7, 1877, by Samuel B. Ames. Shares were sold to buy equipment and mining rights in the area. Originally called the Mica Mine, 2 or 3 acres were worked and the mica was sold for use in stove windows and lamp chimneys. Operations didn’t last too long. As the pit depth increased, an underground spring flooded the pit, and pumps couldn’t keep up with the flow. The original pit is believed to be south of the present pit. The mine was inactive until 1914 or 1915, when the present pit was opened for mica to be used in gas masks for soldiers in WW I. The mica was taken by horse-drawn carts to East Wakefield and loaded unto trains. The mine was closed after a year or two, then re-opened a third time in the 1930’s, when mica was used as electrical insulation in early crystal radio sets; beryl was also reportedly mined for war use."

Cameron et. al. (1954) described the deposit, referred to as the Weeks Feldspar Quarry (named for the owner, Raymond B. Weeks of Burleysville [sic], N.H.): "in the 1920's...feldspar, scrap mica, and beryl were recovered. In the early 1930's, a Mr. Day, Kittery, Maine, operated the quarry for feldspar and scrap mica...In September 1942, J. D. Bardill, District Engineer for the Bureau of Mines, arranged a sampling program under the direction of E. E. Maillot and W. H. Evans. The Bureau of Mines quarried beryl from the north and west sides of the pit, dug 10 small pits and trenches, and drilled 5 horizontal jackhammer holes 12 to 16 feet long in an effort to locate the contacts of the pegmatite. They also pumped out the flooded part of the pit."

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


26 valid minerals. 2 erroneous literature entries.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p.52; USGS Prof Paper 255
Albite var: Cleavelandite
Formula: Na(AlSi3O8)
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p.76; USGS Prof Paper 255
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Description: Cameron, Eugene N. et. al. (1954), p. 107, reported plagioclase with An=19% in border zone of the pegmatite, which would make it oligoclase.
Reference: Cameron, Eugene N.; and others (1954) Pegmatite Investigations, 1942-45, in New England. ( USGS Professional Paper 255).
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Van King; USGS Prof Paper 255
Baddeleyite
Formula: ZrO2
Reference: XRD Czech Geol Survey Pequa Mineral Co specimen
Beryl
Formula: Be3Al2(Si6O18)
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p.76; USGS Prof Paper 255
Chalcopyrite
Formula: CuFeS2
Reference: Rocks & Min. 80:256 (2005)
Chrysoberyl
Formula: BeAl2O4
Colour: yellow to apple-green
Reference: Chayes, Felix (1944): Occurence of Chrysoberyl at Wakefield, Carroll County, New Hampshire (American Mineralogist 29:320-323).
Columbite-(Fe)
Formula: FeNb2O6
Reference: Rocks & Min. 80:256 (2005)
'Columbite-(Fe)-Columbite-(Mn) Series'
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p. 19; USGS Prof Paper 255
Columbite-(Mn)
Formula: (Mn,Fe)(Nb,Ta)2O6
Reference: Rocks & Min. 80:256 (2005)
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Description: The indicolite reported from this locality is dark blue schorl not elbaite.
'commodity:Feldspar'
Reference: From USGS MRDS database
'Feldspar Group'
Reference: USGS Prof Paper 255
'Feldspar Group var: Perthite'
Reference: USGS Prof Paper 255
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Rocks & Min. 80:256 (2005)
Fluorapatite var: Mn-bearing Fluorapatite
Formula: (Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Reference: "Dan Costian" Collection
Fluorite
Formula: CaF2
Reference: Rocks & Min. 80:256 (2005)
'Indicolite'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p.76
Ishikawaite ?
Formula: U4+Fe2+Nb2O8
Description: Four suspected specimens of ishikawaite were analyzed and found to be uraninite (in 2 cases) or samarskite-(Y) (in 2 cases). Tom Mortimer, pers. comm. 2011.
Reference: Rocks & Min. 80:246 (2005)
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Rocks & Min. 80:256 (2005)
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Rocks & Min. 80:256 (2005)
'Manganese Oxides'
Reference: E. L. Clopton collection; "Dan Costian" Collection
'Manganese Oxides var: Manganese Dendrites'
Reference: P. Cristofono collection, 2012
Microcline
Formula: K(AlSi3O8)
Reference: Rocks & Min. 80:256 (2005)
Molybdenite
Formula: MoS2
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p.76; USGS Prof Paper 255
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Gallup, 1970. Granite State Mineral Collecting; USGS Prof Paper 255
Opal
Formula: SiO2 · nH2O
Reference: P. Cristofono collection (ex. Gene Bearss)
Opal var: Hyalite
Formula: SiO2 · nH2O
Reference: P. Cristofono collection (ex. Gene Bearss)
'Parisite' ?
Reference: Rocks & Min. 80:256 (2005)
Phenakite
Formula: Be2SiO4
Reference: Rocks & Min. 80:256 (2005)
Pyrite
Formula: FeS2
Reference: Rocks & Min. 80:256 (2005)
Pyrolusite
Formula: Mn4+O2
Description: No pyrolusite has ever been found in a dendrite or in a pegmatite.
Reference: Gallup, 1970. Granite State Mineral Collecting
Quartz
Formula: SiO2
Reference: Rocks & Min. 80:256 (2005); USGS Prof Paper 255
Samarskite-(Y)
Formula: (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Description: Two specimens of suspected ishikawaite were analyzed by Fred Davis and found to be samarskite-(Y). (Tom Mortimer, pers. comm. 2011)
Reference: Nashua Mineral Society Display Catalog, 1995; USGS Prof Paper 255; Tom Mortimer, pers. comm. 2011
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: P. Cristofono collection, 2014
Synchysite-(Ce) ?
Formula: CaCe(CO3)2F
Description: No data at website
Reference: T Mortimer (mindatnh.org)
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Meyers & Stewart (1956). The Geology of NH: Part III Minerals and Mines. p.76
Uraninite
Formula: UO2
Reference: Tom Mortimer/Fred Davis collections, 2011
'Uvite Series'
Formula: Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Reference: USGS Prof Paper 255
Vesuvianite ?
Formula: (Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Description: Occurence questioned by Smith and Bearss (1991).
Reference: Gallup, 1970. Granite State Mineral Collecting
Zircon
Formula: Zr(SiO4)
Reference: Rocks & Min. 80:256 (2005)
Zircon var: Cyrtolite
Formula: Zr[(SiO4),(OH)4]
Reference: Bearss, Gene T. (1984). The Weeks (Ham) Mine, Wakefield, NH (Micromounters of New England newsletter)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
Molybdenite2.EA.30MoS2
'Pyrite'2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Baddeleyite'4.DE.35ZrO2
'Chrysoberyl'4.BA.05BeAl2O4
Columbite-(Fe)4.DB.35FeNb2O6
Columbite-(Mn)4.DB.35(Mn,Fe)(Nb,Ta)2O6
Ishikawaite ?4.DB.25U4+Fe2+Nb2O8
Magnetite4.BB.05Fe2+Fe3+2O4
Opal4.DA.10SiO2 · nH2O
var: Hyalite4.DA.10SiO2 · nH2O
'Pyrolusite' ?4.DB.05Mn4+O2
'Quartz'4.DA.05SiO2
'Samarskite-(Y)'4.DB.25(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
'Uraninite'4.DL.05UO2
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
'Synchysite-(Ce)' ?5.BD.20cCaCe(CO3)2F
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
var: Mn-bearing Fluorapatite8.BN.05(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
var: Cleavelandite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
'Beryl'9.CJ.05Be3Al2(Si6O18)
Elbaite ?9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
'Microcline'9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
'Phenakite'9.AA.05Be2SiO4
'Spessartine'9.AD.25Mn2+3Al2(SiO4)3
'Uvite Series'9..Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
'Vesuvianite' ?9.BG.35(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
'Zircon'9.AD.30Zr(SiO4)
var: Cyrtolite9.AD.30Zr[(SiO4),(OH)4]
Unclassified Minerals, Rocks, etc.
Columbite-(Fe)-Columbite-(Mn) Series-
Feldspar Group-
'var: Perthite'-
Indicolite-A(D3)G6(T6O18)(BO3)3X3Z
'Manganese Oxides'-
'var: Manganese Dendrites'-
Parisite ?-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX2
Baddeleyite4.4.14.1ZrO2
Pyrolusite ?4.4.1.4Mn4+O2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Chrysoberyl7.2.9.1BeAl2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Ishikawaite ?8.1.4.1U4+Fe2+Nb2O8
Samarskite-(Y)8.1.11.1(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
AB2O6
Columbite-(Fe)8.3.2.2FeNb2O6
Columbite-(Mn)8.3.2.4(Mn,Fe)(Nb,Ta)2O6
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Synchysite-(Ce) ?16a.1.3.1CaCe(CO3)2F
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Phenakite51.1.1.1Be2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Vesuvianite ?58.2.4.1(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Elbaite ?61.3.1.8Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
'Uvite Series'61.3.1.3Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Albite
var: Cleavelandite
-Na(AlSi3O8)
var: Oligoclase-(Na,Ca)[Al(Si,Al)Si2O8]
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Feldspar Group'-
'var: Perthite'-
Fluorapatite
var: Mn-bearing Fluorapatite
-(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
'Indicolite'-A(D3)G6(T6O18)(BO3)3X3Z
'Manganese Oxides'-
'var: Manganese Dendrites'-
Opal
var: Hyalite
-SiO2 · nH2O
'Parisite' ?-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
Zircon
var: Cyrtolite
-Zr[(SiO4),(OH)4]

List of minerals for each chemical element

HHydrogen
H Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
H Opal (var: Hyalite)SiO2 · nH2O
H MalachiteCu2(CO3)(OH)2
H Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H OpalSiO2 · nH2O
H Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
Be ChrysoberylBeAl2O4
Be PhenakiteBe2SiO4
BBoron
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B IndicoliteA(D3)G6(T6O18)(BO3)3X3Z
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
B Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
CCarbon
C MalachiteCu2(CO3)(OH)2
C Synchysite-(Ce)CaCe(CO3)2F
OOxygen
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O BaddeleyiteZrO2
O BerylBe3Al2(Si6O18)
O ChrysoberylBeAl2O4
O Albite (var: Cleavelandite)Na(AlSi3O8)
O Columbite-(Fe)FeNb2O6
O Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
O Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O FluorapatiteCa5(PO4)3F
O Opal (var: Hyalite)SiO2 · nH2O
O IndicoliteA(D3)G6(T6O18)(BO3)3X3Z
O IshikawaiteU4+Fe2+Nb2O8
O MagnetiteFe2+Fe23+O4
O MalachiteCu2(CO3)(OH)2
O MicroclineK(AlSi3O8)
O Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
O MuscoviteKAl2(AlSi3O10)(OH)2
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O OpalSiO2 · nH2O
O PhenakiteBe2SiO4
O PyrolusiteMn4+O2
O QuartzSiO2
O Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
O SpessartineMn32+Al2(SiO4)3
O Synchysite-(Ce)CaCe(CO3)2F
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O UraniniteUO2
O Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
O ZirconZr(SiO4)
FFluorine
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
F Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
F Synchysite-(Ce)CaCe(CO3)2F
F Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
NaSodium
Na AlbiteNa(AlSi3O8)
Na Albite (var: Cleavelandite)Na(AlSi3O8)
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
MgMagnesium
Mg Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
AlAluminium
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al BerylBe3Al2(Si6O18)
Al ChrysoberylBeAl2O4
Al Albite (var: Cleavelandite)Na(AlSi3O8)
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al SpessartineMn32+Al2(SiO4)3
Al Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
SiSilicon
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si BerylBe3Al2(Si6O18)
Si Albite (var: Cleavelandite)Na(AlSi3O8)
Si Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Opal (var: Hyalite)SiO2 · nH2O
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si OpalSiO2 · nH2O
Si PhenakiteBe2SiO4
Si QuartzSiO2
Si SpessartineMn32+Al2(SiO4)3
Si Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Si ZirconZr(SiO4)
PPhosphorus
P FluorapatiteCa5(PO4)3F
P Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
SSulfur
S ChalcopyriteCuFeS2
S MolybdeniteMoS2
S PyriteFeS2
ClChlorine
Cl Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluorapatiteCa5(PO4)3F
Ca FluoriteCaF2
Ca Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Ca Synchysite-(Ce)CaCe(CO3)2F
Ca Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
MnManganese
Mn Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
Mn Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Mn PyrolusiteMn4+O2
Mn SpessartineMn32+Al2(SiO4)3
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe ChalcopyriteCuFeS2
Fe Columbite-(Fe)FeNb2O6
Fe Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
Fe IshikawaiteU4+Fe2+Nb2O8
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
Fe Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Fe Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
CuCopper
Cu ChalcopyriteCuFeS2
Cu MalachiteCu2(CO3)(OH)2
YYttrium
Y Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ZrZirconium
Zr BaddeleyiteZrO2
Zr Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Zr ZirconZr(SiO4)
NbNiobium
Nb Columbite-(Fe)FeNb2O6
Nb Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
Nb IshikawaiteU4+Fe2+Nb2O8
Nb Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
MoMolybdenum
Mo MolybdeniteMoS2
CeCerium
Ce Synchysite-(Ce)CaCe(CO3)2F
TaTantalum
Ta Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
Ta Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ThThorium
Th Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
UUranium
U IshikawaiteU4+Fe2+Nb2O8
U Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
U UraniniteUO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Pennsylvanian - Mississippian
298.9 - 358.9 Ma



ID: 2942029
Two-mica granite of the Sebago batholith and Effingham pluton of eastern New Hampshire

Age: Carboniferous (298.9 - 358.9 Ma)

Description: Sebago batholith = 325+/-? Rb/Sr per NH026. 325+/-3 U/Pb per NH017. 298+/-2 U/Pb per J.N. Aleinikoff, oral commun., Dec. 24, 1992. Effingham pluton = 325+/-? Rb/Sr per NH026.

Comments: Original map source: Bennett, D.S., Wittkop, C.A., and Dicken, C.L., 2006, Bedrock Geologic Map of New Hampshire - A Digital Representation of the Lyons and others 1997 map and ancillary files: U.S. Geological Survey Data Series 215, CD-ROM, scale 1:250,000.

Lithology: Major:{granite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Devonian - Silurian
358.9 - 443.8 Ma



ID: 3185212
Paleozoic intrusive rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Pennington, Mary Engle (1895). Derivatives of Columbium and Tantalum (Analysis of Wakefield Columbite). Journal of the American Chemical Society:: 1,(Part 1): 38-66.
Bardill (1943): Weeks Feldspar Quarry, USBM War Minerals Report 81.
Chayes, Felix (1944): Occurence of Chrysoberyl at Wakefield, Carroll County, New Hampshire, American Mineralogist: 29: 320-323.
Cameron, Eugene N.; and others (1954) Pegmatite Investigations, 1942-45, in New England. USGS Professional Paper 255.
Morong, Dana (1983). New Hampshire Mineral Localities, Durham, NH (privately published): 14.
Bearss, Gene T. (1984). The Weeks (Ham) Mine, Wakefield, NH, Micromounters of New England newsletter.
Smith, Arthur and Bearss, Gene (1991): The Weeks Pegmatite Mine, Wakefield, Carroll County, New Hampshire, Rocks & Minerals: 66: 129-135.
Smith, Arthur (2002): Hunting for Uranium Minerals in the Hamm-Weeks Pegmatite, Wakefield, Carroll County, New Hampshire. Mineral News: 18(4)(April).

External Links

http://www.micromountersofnewengland.org/pdfs/weeks-ham-mine.pdf [Bearss, Gene T. (1984). The Weeks (Ham) Mine, Wakefield, NH; Micromounters of New England newsletter]



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