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Wiant's Quarry (Weiant Quarry), Pilot, State Line District, Cecil Co., Maryland, USAi
Regional Level Types
Wiant's Quarry (Weiant Quarry)Quarry
Pilot- not defined -
State Line DistrictMining District
Cecil Co.County

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Latitude & Longitude (WGS84): 39° 42' 32'' North , 76° 11' 21'' West
Latitude & Longitude (decimal): 39.70892,-76.18935
GeoHash:G#: dr1cfkb95
USGS MRDS Record:10266794
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate
Nearest Settlements:
Wakefield609 (2017)7.3km
Darlington409 (2011)7.8km
Little Britain372 (2017)10.0km
Rising Sun2,859 (2017)10.9km
Delta724 (2017)11.9km

A desilicated pegmatite in serpentine.

In the American Mineralogist Vol.12 Num. 11, Earl V. Shannon, 1927, states from Samuel G. Gordon's paper on Desilicated Granitic Pegmatites of the Vicinity of the Pennsylvania-Maryland State Line:

"That the albitite of Wiant's quarry, three quarters of a mile northeast of Pilot, Cecil County, Maryland, is filled with miarolitic cavities which are lined with minute, colorless, albite crystals. He further says that the minute, transparent, greenish, highly modified beryl crystals occur rarely implanted on the albite, while not infrequently the rest of the cavity is filled with matted masses of dark green actinolite needles.”

“Mr. Gordon then suggested that it was probable that the supposed beryl crystals were in reality apatite. Mr. Gordon very kindly forwarded the writer several specimens which he had previously collected. These have been studied in the Museum’s Laboratory and the mineral was found to be apatite.”

“The apatite crystals are sparsely scattered over the drusy crusts of colorless or brown, iron-stained albite crystals which line the narrow miarolitic cavities in massive white albite. Individual crystals of the apatites reach a length of 4 or 5 mm, with a thickness of 2 mm, although most of them are somewhat smaller. The larger ones are green while the smaller ones are colorless and are not easy to distinguish from the colorless albite crystals on which they rest. The longer apatite crystals show cleavage parallel to the base. Many of the larger ones are bluish-green, partly opaque, and rather soft and friable as though they had suffered partial disintegration through weathering.”
Deposit: The chrome bearing sand is covered by about 5 ft of overburden. The chromite content is said to be lo W and cr Fe ratio fair. No systematic sampling or investigation of the deposit seems to have been done. Date of comments 1975.

Regions containing this locality

North America PlateTectonic Plate

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

11 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Formula: Na(AlSi3O8)
Formula: (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Formula: Be3Al2(Si6O18)
Formula: CaCO3
'Chlorite Group'
Formula: Mg4Si3O10 · 6H2O ?
Formula: CaMg(CO3)2
Formula: MgCO3
Formula: SiO2 · nH2O
Formula: FeS2
Formula: SiO2
Quartz var: Chalcedony
Formula: SiO2
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Formula: Mg3Si4O10(OH)2
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Opal4.DA.10SiO2 · nH2O
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Group 9 - Silicates
Beidellite9.EC.40(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Beryl ?9.CJ.05Be3Al2(Si6O18)
Vermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Deweylite'-Mg4Si3O10 · 6H2O ?
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl ?
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Vermiculite71.2.2d.3Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Sheets of 6-membered rings with 2:1 clays
Beidellite71.3.1a.1(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
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
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Deweylite'-Mg4Si3O10 · 6H2O ?
var: Chalcedony
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

H Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
H TalcMg3Si4O10(OH)2
H DeweyliteMg4Si3O10 · 6H2O ?
H OpalSiO2 · nH2O
H Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Be BerylBe3Al2(Si6O18)
C MagnesiteMgCO3
C CalciteCaCO3
C DolomiteCaMg(CO3)2
O Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O AlbiteNa(AlSi3O8)
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
O TalcMg3Si4O10(OH)2
O DeweyliteMg4Si3O10 · 6H2O ?
O OpalSiO2 · nH2O
O Quartz (var: Chalcedony)SiO2
O MagnesiteMgCO3
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
O QuartzSiO2
O BerylBe3Al2(Si6O18)
Na AlbiteNa(AlSi3O8)
Na Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Mg Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Mg TalcMg3Si4O10(OH)2
Mg DeweyliteMg4Si3O10 · 6H2O ?
Mg MagnesiteMgCO3
Mg DolomiteCaMg(CO3)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al AlbiteNa(AlSi3O8)
Al VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Al Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Al BerylBe3Al2(Si6O18)
Si Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si AlbiteNa(AlSi3O8)
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Si TalcMg3Si4O10(OH)2
Si DeweyliteMg4Si3O10 · 6H2O ?
Si OpalSiO2 · nH2O
Si Quartz (var: Chalcedony)SiO2
Si Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Si QuartzSiO2
Si BerylBe3Al2(Si6O18)
S PyriteFeS2
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Mn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Fe PyriteFeS2
Ni Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Zn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

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

Paleozoic - Proterozoic
251.902 - 2500 Ma

ID: 2824500
Ultramafic Rocks

Age: to Triassic (251.902 - 2500 Ma)

Description: Chiefly serpentinite with partly to completely altered dunite, peridotite, pyroxenite, and massive to schistose soapstone; talc-carbonate rock and altered gabbro are common in some bodies.

Comments: Original map source: In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at

Lithology: Major:{serpentinite}, Incidental:{dunite, peridotite, pyroxenite, gabbro}

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]

485.4 - 541 Ma

ID: 3189717
Paleozoic sedimentary and volcanic rocks

Age: Cambrian (485.4 - 541 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

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, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Shannon, Earl V., (1927), Apatite Crystals from the Wiant's Quarry, near Pilot, Maryland. American Mineralogist: 12: 408-410.
Singewald, J. T. (1928) Notes on feldspar, quartz, chrome and manganese in Maryland: Maryland Geological Survey vol. 12 part 2: 91-194.
Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 813.
Pearre N Heyl a Jr USGS Bul (1082)k Pg 784 1960

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