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⇱ Clark Granite Quarry, Clark Island, Saint George, Knox County, Maine, USA

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Clark Granite Quarry, Clark Island, Saint George, Knox County, Maine, USAi
Regional Level Types
Clark Granite QuarryQuarry (Flooded)
Clark IslandIsland
Saint GeorgeTown
Knox CountyCounty
MaineState
USACountry

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Latitude & Longitude (WGS84):
43° North , 69° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~1km
Type:
Quarry (Flooded) - last checked 2026
Mindat Locality ID:
50108
Long-form identifier:
mindat:1:2:50108:9
GUID (UUID V4):
0


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Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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


Mineral List


7 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Entries shown in red are rocks recorded for this region.

Detailed Mineral List:

ⓘ Almandine
Formula: Fe2+3Al2(SiO4)3
References:
ⓘ Chamosite
Formula: Fe2+5Al(AlSi3O)10(OH)8
References:
ⓘ Fluorapatite
Formula: Ca5(PO4)3F
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Rutilated Quartz
Formula: SiO2
ⓘ Rutile
Formula: TiO2
ⓘ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Zircon
Formula: Zr(SiO4)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
ⓘvar. Rutilated Quartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
Group 8 - Phosphates, Arsenates and Vanadates
ⓘFluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
ⓘAlmandine9.AD.25Fe2+3Al2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘChamosite9.EC.55Fe2+5Al(AlSi3O)10(OH)8

List of minerals for each chemical element

HHydrogen
Hⓘ ChamositeFe52+Al(AlSi3O)10(OH)8
Hⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
Bⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
Oⓘ AlmandineFe32+Al2(SiO4)3
Oⓘ ChamositeFe52+Al(AlSi3O)10(OH)8
Oⓘ FluorapatiteCa5(PO4)3F
Oⓘ QuartzSiO2
Oⓘ Quartz var. Rutilated QuartzSiO2
Oⓘ RutileTiO2
Oⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ ZirconZr(SiO4)
FFluorine
Fⓘ FluorapatiteCa5(PO4)3F
NaSodium
Naⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Alⓘ AlmandineFe32+Al2(SiO4)3
Alⓘ ChamositeFe52+Al(AlSi3O)10(OH)8
Alⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Siⓘ AlmandineFe32+Al2(SiO4)3
Siⓘ ChamositeFe52+Al(AlSi3O)10(OH)8
Siⓘ QuartzSiO2
Siⓘ Quartz var. Rutilated QuartzSiO2
Siⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ ZirconZr(SiO4)
PPhosphorus
Pⓘ FluorapatiteCa5(PO4)3F
CaCalcium
Caⓘ FluorapatiteCa5(PO4)3F
TiTitanium
Tiⓘ RutileTiO2
FeIron
Feⓘ AlmandineFe32+Al2(SiO4)3
Feⓘ ChamositeFe52+Al(AlSi3O)10(OH)8
Feⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
ZrZirconium
Zrⓘ ZirconZr(SiO4)

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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