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Reeser's Summit, Frogtown, York Co., Pennsylvania, USAi
Regional Level Types
Reeser's Summit- not defined -
Frogtown- not defined -
York Co.County
PennsylvaniaState
USACountry

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Key
Latitude & Longitude (WGS84):
40° 12' 2'' North , 76° 52' 2'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
New Market816 (2017)2.8km
New Cumberland7,295 (2017)3.8km
Lower Allen6,694 (2017)4.0km
Steelton5,932 (2017)4.4km
Enhaut1,007 (2017)4.9km


A PGM occurrence located about 2.3 km (7,400 feet) NNW of Frogtown, in the Steelton quadrangle.

PGM minerals are found as micron-sized grains in ferrogabbro phase of the York Haven Diabase. Also found are unnamed Pd3Sb2, (Pd,Pt)(As,Sb) and an uytenbogaardite-like mineral.

NOTE: The andradite image shown above this entry as of 2/22/2012 is from a different, unrelated occurrence.

On 5/14/2012, R. C. Smith, II and J.H. Barnes identified a single, 2x2 micron euhedral grain of sperrylite containing 1.35 % Co, 0.32 Ni, 44.61 As, 0.66 Pd, 1.93 Ir, and 51.12 Pt. It was closely associated with as yet, unidentified (Ni,Fe,Co)4(As,S)3 and (Ni,Fe,Co)3(As,S)2. This sample, as those previously studied, was from 246 to 260 m from the upper contact of the York Haven Diabase on the east side of I-83, Fairview Township, York County, Pennsylvania.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

Bornite
Formula: Cu5FeS4
Reference: Pennsylvania Geology, vol. 39(1), 2009 - PA Geol. Survey
Chalcopyrite
Formula: CuFeS2
Reference: Pennsylvania Geology, vol. 39(1), 2009 - PA Geol. Survey
Cobaltite
Formula: CoAsS
Reference: Pennsylvania Geology, vol. 39(1), 2009 - PA Geol. Survey
Fayalite
Formula: Fe2+2SiO4
Habit: Millimeter sized grains with a pebbly surface, high relief
Colour: nearly colorless to very pale yellowish green
Description: Occuring in Quartz ferrogabbo, Fayalite has been observed only in thin section. Millimeter sized grains with a pebbly surface, high relief. The grains are nearly colorless to very pale yellowish green with pastel interfefence colors under crossed nicols.
Reference: Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of PA, Inc.: 35; Smith, Robert C., II and Rose, Arthur W. (1972), "Major and Trace Elements in Differentiates of Triassic Diabase and T
Galena
Formula: PbS
Reference: Pennsylvania Geology, vol. 39(1), 2009 - PA Geol. Survey
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Econ Geol (1985) 80:418-443
Safflorite
Formula: (Co,Ni,Fe)As2
Reference: Pennsylvania Geology, vol. 39(1), 2009 - PA Geol. Survey
Sperrylite
Formula: PtAs2
Reference: Robwert C. Smith, II Ph.D. P.G.
Sphalerite
Formula: ZnS
Reference: Smith and Barnes (2008): Mineralogy, petrology, and mineralization of the Valley Quaries, Inc., Gettysburg Quarry, formerly the H. T. Campbel Quary, Adams County, Guidebook 73 rd Field Conference of Pennsylvania Geologists, p. 79 - 81.
Sudburyite
Formula: (Pd,Ni)Sb
Reference: Pennsylvania Geology, vol. 39(1), 2009 - PA Geol. Survey
Ulvöspinel
Formula: TiFe2O4
Description: Discovered in microprobe analysis, accepted from analysis by Robert C. Smith (1973), however no evidence has been presented for a specimen containing greater than 50 mol-percent Ulvöspinel.
Reference: Reed, Juliet C. (1976), Annotated Biblio. of Mins. New to the Pa List 1965-1974, The Mineralogical Soc. of PA, Inc.: 35, 75; Smith, R. C., II (1973), "Geochemistry of Triassic Diabase from SE Pennsylvania," unpub. PhD Dissertation, 262 p., PA State Univ.;
Ungavaite
Formula: Pd4Sb3
Reference: Smith and Barnes (2011) Table 4.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcopyrite2.CB.10aCuFeS2
Cobaltite2.EB.25CoAsS
Galena2.CD.10PbS
Safflorite2.EB.15a(Co,Ni,Fe)As2
Sperrylite2.EB.05aPtAs2
Sphalerite2.CB.05aZnS
Sudburyite2.CC.05(Pd,Ni)Sb
Ungavaite2.AC.35bPd4Sb3
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Ulvöspinel4.BB.05TiFe2O4
Group 9 - Silicates
Fayalite9.AC.05Fe2+2SiO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Cobaltite2.12.3.1CoAsS
Safflorite2.12.2.11(Co,Ni,Fe)As2
Sperrylite2.12.1.13PtAs2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Ulvöspinel7.2.5.2TiFe2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Fayalite51.3.1.1Fe2+2SiO4
Unclassified Minerals, Mixtures, etc.
Sudburyite-(Pd,Ni)Sb
Ungavaite-Pd4Sb3

List of minerals for each chemical element

OOxygen
O MagnetiteFe2+Fe23+O4
O FayaliteFe22+SiO4
O UlvöspinelTiFe2O4
SiSilicon
Si FayaliteFe22+SiO4
SSulfur
S BorniteCu5FeS4
S ChalcopyriteCuFeS2
S CobaltiteCoAsS
S GalenaPbS
S SphaleriteZnS
TiTitanium
Ti UlvöspinelTiFe2O4
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe FayaliteFe22+SiO4
Fe UlvöspinelTiFe2O4
CoCobalt
Co CobaltiteCoAsS
Co Safflorite(Co,Ni,Fe)As2
CuCopper
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AsArsenic
As CobaltiteCoAsS
As Safflorite(Co,Ni,Fe)As2
As SperrylitePtAs2
PdPalladium
Pd Sudburyite(Pd,Ni)Sb
Pd UngavaitePd4Sb3
SbAntimony
Sb Sudburyite(Pd,Ni)Sb
Sb UngavaitePd4Sb3
PtPlatinum
Pt SperrylitePtAs2
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Smith, Robert C., II and Rose, Arthur W. (1972), "Major and Trace Elements in Differentiates of Triassic Diabase and Their Relationship to Cornwall-Type Magnetite Ores," Geological Society of America Abstracts with Programs: 4(7): 671.
Smith, Robert C., II (1973), "Geochemistry of Triassic Diabase from Southeastern Pennsylvania," unpublished PhD Dissertation, 262 p., Pennsylvania State University.
Grant, Raymond W. (1973), "Revised Pennsylvania Mineral Lists and Index, Keystone Newsletter: in Pennsylvania Minerals (PM) (Feb. & Mar.): 122 & 123.
Grant, Raymond (1974), Pennsylvania Minerals (PM) (May & Jun): 137 & 138.
Reed, Juliet C. (1976), Annotated Bibliography of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of Pennsylvania, Inc.: 35, 75.
Smith, II, R. C. and Barnes, J. H. (2009) Sudburyite, safflorite, and other microminerals in the Platinum-Group Element Enriched Ferrogabbro, York Haven Diabase, Reesers Summit, York County, Pennsylvania, Pennsylvania Geology, vol. 39(1), p. 6 - 15.
Smith, II, R. C. and Barnes, J. H. (2011) Geochemistry and Mineralogy of Platinum Group Elements in Some Chromite Occurrences in the State Line District [Pennsylvania] Pennsylvania Geology, v. 41, no. 3/4, p. 3-13 plus 4 Tables with 18 p. of minerals confirmed and data tables. l

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