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Yedlin Locality, Topsham, Sagadahoc Co., Maine, USA

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Latitude & Longitude (WGS84): 43° 55' 18'' North , 69° 58' 44'' West
Latitude & Longitude (decimal): 43.92167,-69.97889
GeoHash:G#: dry1zedym
Köppen climate type:Dfb : Warm-summer humid continental climate


Two shallow feldspar prospect pits. Brunswick pegmatite field. Granite Pegmatite. Very radioactive bedrock in the area.

Critical Areas Status:

The Yedlin Locality is a small prospect area recognized by Neal Yedlin as containing good crystals of what was then identified as "samarskite". The locality was described by him in Rocks and Minerals magazine. Because of the article, the locality became known as the Yedlin Prospect. Subsequently, the mineral of interest was re-identified as ishakawaite and it was then that the locality acquired international status for having specimens that are world class size and quality. The locality is an area that is inventoried by the USA Critical Mineral Areas program and designated as a Most Important Site needing protection from development. This habitat is also the only place in Maine where fergusonite-(Y) has been found. The largest xenotime-(Y) crystal from Maine is from this locality. The habitat consists of an area comprising about 1 hectare. The area is also noted as one where the bedrock contains naturally significantly radioactive minerals.

May 11, 2014; the area on the north side of the water filled trench (toward the large water tank and new road) has been cleared for development, but not the primary dump side of the trench (south side). Ishikawaite crystals were found in dumps on both sides of the trench, however.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


19 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Autunite
Formula: Ca(UO2)2(PO4)2 · 11H2O
Reference: No reference listed
Beryl
Formula: Be3Al2(Si6O18)
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
'Biotite'
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Columbite-(Fe)
Formula: FeNb2O6
Habit: elongated, flattened prisms
Colour: black with iridescence
Description: Epitaxial micro-crystals in parallel growth on ishikawaite.
Reference: Harold Moritz observations; Fred E. Davis XRF analysis
Fergusonite-(Y)
Formula: YNbO4
Reference: King & Foord, 1994. Mineralogy of Maine, V. 1.; King and Foord, 2000, Addenda to Volume 1, Mineralogy of Maine, v. 2.
Hematite
Formula: Fe2O3
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Ishikawaite
Formula: U4+Fe2+Nb2O8
Reference: King, V. and Foord,E., 1994, 2000, Mineralogy of Maine.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Meta-autunite
Formula: Ca(UO2)2(PO4)2 · 6-8H2O
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Microcline
Formula: K(AlSi3O8)
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Monazite-(Ce)
Formula: Ce(PO4)
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Nontronite
Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Reference: King & Foord, 1994: Mineralogy of Maine, V.1
Opal
Formula: SiO2 · nH2O
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Opal var: Opal-AN
Formula: SiO2 · nH2O
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Quartz
Formula: SiO2
Reference: "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
Xenotime-(Y)
Formula: Y(PO4)
Reference: King & Foord, 1994. Mineralogy of Maine, V. 1.; King and Foord, 2000, Addenda to Volume 1, Mineralogy of Maine, v. 2.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Columbite-(Fe)'4.DB.35FeNb2O6
'Hematite'4.CB.05Fe2O3
'Ishikawaite'4.DB.25U4+Fe2+Nb2O8
'Magnetite'4.BB.05Fe2+Fe3+2O4
'Opal'4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Fergusonite-(Y)'7.GA.05YNbO4
Group 8 - Phosphates, Arsenates and Vanadates
'Autunite'8.EB.05Ca(UO2)2(PO4)2 · 11H2O
'Meta-autunite'8.EB.10Ca(UO2)2(PO4)2 · 6-8H2O
'Monazite-(Ce)'8.AD.50Ce(PO4)
Xenotime-(Y)8.AD.35Y(PO4)
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
'Allanite-(Ce)'9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
'Annite'9.EC.20KFe2+3(AlSi3O10)(OH)2
'Beryl'9.CJ.05Be3Al2(Si6O18)
'Microcline'9.FA.30K(AlSi3O8)
'Muscovite'9.EC.15KAl2(AlSi3O10)(OH)2
'Nontronite'9.EC.40Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Unclassified Minerals, Rocks, etc.
'Biotite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Fergusonite-(Y)8.1.1.1YNbO4
Ishikawaite8.1.4.1U4+Fe2+Nb2O8
AB2O6
Columbite-(Fe)8.3.2.2FeNb2O6
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
Monazite-(Ce)38.4.3.1Ce(PO4)
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Autunite40.2a.1.1Ca(UO2)2(PO4)2 · 11H2O
Meta-autunite40.2a.1.2Ca(UO2)2(PO4)2 · 6-8H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
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)
Allanite-(Ce)58.2.1a.1{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Annite71.2.2b.3KFe2+3(AlSi3O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Sheets of 6-membered rings with 2:1 clays
Nontronite71.3.1a.3Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
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.
'Biotite'-
Opal
var: Opal-AN
-SiO2 · nH2O
Xenotime-(Y)-Y(PO4)

List of minerals for each chemical element

HHydrogen
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H AnniteKFe32+(AlSi3O10)(OH)2
H AutuniteCa(UO2)2(PO4)2 · 11H2O
H Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
H OpalSiO2 · nH2O
H Opal (var: Opal-AN)SiO2 · nH2O
BeBeryllium
Be BerylBe3Al2(Si6O18)
OOxygen
O AlbiteNa(AlSi3O8)
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O AlmandineFe32+Al2(SiO4)3
O AnniteKFe32+(AlSi3O10)(OH)2
O AutuniteCa(UO2)2(PO4)2 · 11H2O
O BerylBe3Al2(Si6O18)
O Columbite-(Fe)FeNb2O6
O Fergusonite-(Y)YNbO4
O HematiteFe2O3
O IshikawaiteU4+Fe2+Nb2O8
O MagnetiteFe2+Fe23+O4
O Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
O MicroclineK(AlSi3O8)
O Monazite-(Ce)Ce(PO4)
O MuscoviteKAl2(AlSi3O10)(OH)2
O NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
O OpalSiO2 · nH2O
O Opal (var: Opal-AN)SiO2 · nH2O
O QuartzSiO2
O Xenotime-(Y)Y(PO4)
NaSodium
Na AlbiteNa(AlSi3O8)
Na NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
AlAluminium
Al AlbiteNa(AlSi3O8)
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Al AlmandineFe32+Al2(SiO4)3
Al AnniteKFe32+(AlSi3O10)(OH)2
Al BerylBe3Al2(Si6O18)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
SiSilicon
Si AlbiteNa(AlSi3O8)
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si AlmandineFe32+Al2(SiO4)3
Si AnniteKFe32+(AlSi3O10)(OH)2
Si BerylBe3Al2(Si6O18)
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Si OpalSiO2 · nH2O
Si Opal (var: Opal-AN)SiO2 · nH2O
Si QuartzSiO2
PPhosphorus
P AutuniteCa(UO2)2(PO4)2 · 11H2O
P Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
P Monazite-(Ce)Ce(PO4)
P Xenotime-(Y)Y(PO4)
KPotassium
K AnniteKFe32+(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca AutuniteCa(UO2)2(PO4)2 · 11H2O
Ca Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
FeIron
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe AlmandineFe32+Al2(SiO4)3
Fe AnniteKFe32+(AlSi3O10)(OH)2
Fe Columbite-(Fe)FeNb2O6
Fe HematiteFe2O3
Fe IshikawaiteU4+Fe2+Nb2O8
Fe MagnetiteFe2+Fe23+O4
Fe NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
YYttrium
Y Fergusonite-(Y)YNbO4
Y Xenotime-(Y)Y(PO4)
NbNiobium
Nb Columbite-(Fe)FeNb2O6
Nb Fergusonite-(Y)YNbO4
Nb IshikawaiteU4+Fe2+Nb2O8
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ce Monazite-(Ce)Ce(PO4)
UUranium
U AutuniteCa(UO2)2(PO4)2 · 11H2O
U IshikawaiteU4+Fe2+Nb2O8
U Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O

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

Ordovician - Neoproterozoic
443.8 - 1000 Ma



ID: 2790238
Ordovician - Precambrian Z Cushing Formation

Age: Neoproterozoic to Ordovician (443.8 - 1000 Ma)

Stratigraphic Name: Cushing Formation

Description: W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist facies; Protolith W - Mafic to felsic volcanic rocks

Comments: Original map source: Digital bedrock data downloaded from Maine Office of GIS in September 2005; permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006. Based on 1985 paper geologic map (Reference ME002).

Lithology: Major:{felsic volcanic,mafic volcanic}

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]

Ordovician - Cambrian
443.8 - 541 Ma



ID: 3189709
Paleozoic sedimentary rocks

Age: Paleozoic (443.8 - 541 Ma)

Lithology: Limestone,shale

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)
Lane, Alfred C. (1937) Exhibit 7; Work at Harvard University (in Lane, A. C. and Marble, J. P.), Report of the Committee on the Measurement of Geologic Time, National Research Council, Washington, DC, p. 59-61.
Yedlin, Leo Neal (1942) Standpipe Hill, Topsham, Maine, Rocks and Minerals, 17:206-208.
King, Vandall T. (1993) Critical Areas Program. Preliminary Report to the Eastern Federation of Mineralogical and Lapidary Societies, Rochester Academy of Science, Rochester, NY, pp. 42.
Hanson, S. L., Simmons, W. B., and Falster, A. U. (1995) Ishikawaite, Polycrase, or "Samarskite" in Maine Pegmatites?, Rochester Mineral Symposium, Program and Abstracts, 22:14-15.
Hanson, S. L., Simmons W. B. and Falster, A. U. (1998) New Data on Nb-Ta-Ti Oxides from the Topsham Pegmatite District, Eastern Maine. Canadian Mineralogist. 36, p.601-608.
Hanson, S. L., Simmons, W. B., Falster, A. U., Foord, E. E., and Lichte, F. E. (1999) Proposed Nomenclature for Samarskite Group Minerals: New Data on Ishakawaite and Calciosamarskite, Mineralogical Magazine, 63: 27-37.
Nemetz, Janet and King, Van (2014) Re-investigation of the Yedlin Locality, Topsham, Sagadahoc County, Maine, USA, Rochester Mineral Symposium, Program and Abstracts, 41:22-23.


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