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General Trimble's Mine, East Whiteland Township, Chester Co., Pennsylvania, USA

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Latitude & Longitude (WGS84): 40° 0' 50'' North , 75° 38' 14'' West
Latitude & Longitude (decimal): 40.01389,-75.63722
GeoHash:G#: dr45wu69u
Locality type:Mine
Köppen climate type:Cfa : Humid subtropical climate


A 19th Century Iron mine, located in East Whiteland Township (an historical locale) near Downingtown, which exploited residual deposits of Goethite and Limonite that formed along Shenandoah Limestone.

Located about 1/4 mile NW of the railway Planebrook Station.

Note on the mineral list: for "coeruleolactite" see references and information given for planerite, all turquoise group minerals are found to be planerite at this locality.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

'Coeruleolactite'
Description: See also planerite entry for this locality. This material is cuprian planerite or "half-empty" turquoise. Published analysis indicates that the vacany in the 'A' site is between 0.51-0.54 atom fraction, the balance in Cu-0.40 and Zn-0.06 to 0.09, so this is indeed planerite.
Reference: Foord, E.E. & Taggart, J.E. (1998): A reexamination of the turquoise group; the mineral aheylite, planerite (redefined), turquoise and coeruleolactite. Mineralogical Magazine, 62, 93-111
Gibbsite
Formula: Al(OH)3
Reference: The Mineralogy of Pennsylvania - 1922; Samuel G. Gordon pg.170; Genth, F.A. (1875) Preliminary Report on the Mineralogy of Pennsylvania. Second Geological Survey of Pennsylvania, Harrisburg.
Goethite
Formula: α-Fe3+O(OH)
Reference: The Mineralogy of Pennsylvania - 1922; Samuel G. Gordon pg.170
Hematite
Formula: Fe2O3
Reference: Dana 6:1068; Dana 7:II:961.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: The Mineralogy of Pennsylvania - 1922; Samuel G. Gordon pg.170
Matulaite
Formula: (Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
Reference: Handbook of Mineralogy
Planerite
Formula: Al6(PO4)2(HPO4)2(OH)8 · 4 H2O
Description: Was originally reported to be coeruleolactite. Cuprian planerite or "half-empty" turquoise. Published analysis indicates that the vacany in the 'A' site is between 0.51-0.54 atom fraction, the balance in Cu-0.40 and Zn-0.06 to 0.09, so this is indeed planerite.
Reference: Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 1068; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 961. Foord, E.E. & Taggart, J.E. (1998): A reexamination of the turquoise group; the mineral aheylite, planerite (redefined), turquoise and coeruleolactite. Mineralogical Magazine, 62, 93-111.
Wavellite
Formula: Al3(PO4)2(OH,F)3 · 5H2O
Reference: Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 1068; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 961, 964.; Genth, F.A. (1875) Preliminary Report on the Mineralogy of Pennsylvania. Second Geological Survey of Pennsylvania, Harrisburg.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Gibbsite'4.FE.10Al(OH)3
'Goethite'4.00.α-Fe3+O(OH)
'Hematite'4.CB.05Fe2O3
Group 8 - Phosphates, Arsenates and Vanadates
'Matulaite'8.DK.30(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
'Planerite'8.DD.15Al6(PO4)2(HPO4)2(OH)8 · 4 H2O
'Wavellite'8.DC.50Al3(PO4)2(OH,F)3 · 5H2O
Unclassified Minerals, Rocks, etc.
'Coeruleolactite' ?-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
X(OH)3
Gibbsite6.3.1.1Al(OH)3
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)7(XO4)4Zq·xH2O
'Coeruleolactite' ?42.9.3.2
Planerite42.9.3.6Al6(PO4)2(HPO4)2(OH)8 · 4 H2O
A3(XO4)2Zq·xH2O
Wavellite42.10.2.1Al3(PO4)2(OH,F)3 · 5H2O
Miscellaneous
Matulaite42.13.3.1(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H GibbsiteAl(OH)3
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
H PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
H WavelliteAl3(PO4)2(OH,F)3 · 5H2O
OOxygen
O GibbsiteAl(OH)3
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O Limonite(Fe,O,OH,H2O)
O Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
O PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
O WavelliteAl3(PO4)2(OH,F)3 · 5H2O
FFluorine
F WavelliteAl3(PO4)2(OH,F)3 · 5H2O
AlAluminium
Al GibbsiteAl(OH)3
Al Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
Al PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
Al WavelliteAl3(PO4)2(OH,F)3 · 5H2O
PPhosphorus
P Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
P PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
P WavelliteAl3(PO4)2(OH,F)3 · 5H2O
FeIron
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe Limonite(Fe,O,OH,H2O)
Fe Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 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

Paleozoic
251.902 - 541 Ma



ID: 3025822
Octoraro Formation

Age: Phanerozoic (251.902 - 541 Ma)

Stratigraphic Name: Octoraro Formation

Description: Includes albite-chlorite schist, phyllite, some hornblende gneiss, and granitized members.

Comments: Digital map differences from 1980 printed map: name and map symbol changed from (Wissahickon Formation, albite-chlorite schist) (Xwc). Original map source: Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

Lithology: Major:{schist,phyllite}, Minor:{hornblende gneiss,granitic}

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]

Cambrian
485.4 - 541 Ma



ID: 3192822
Paleozoic sedimentary rocks

Age: Cambrian (485.4 - 541 Ma)

Lithology: Sedimentary 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)
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 1068.
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania: 170.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 961, 964.
Foord, E.E. & Taggart, J.E. (1998): A reexamination of the turquoise group; the mineral aheylite, planerite (redefined), turquoise and coeruleolactite. Mineralogical Magazine, 62, 93-111.


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