Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Loudon Marble Company Quarry, Loudoun County, Virginia, USAi
Regional Level Types
Loudon Marble Company QuarryQuarry
Loudoun CountyCounty
VirginiaState
USACountry

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Latitude & Longitude (WGS84):
39° 1' 30'' North , 77° 40' 56'' West
Latitude & Longitude (decimal):
39.02500,-77.68222
GeoHash:
G#: dqby02391
GRN:
N27W43
Type:
Quarry
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Middleburg807 (2017)7.8km
Hamilton609 (2017)12.3km
Purcellville9,232 (2017)12.7km
Brambleton9,845 (2011)13.3km
Bull Run Mountain Estates1,251 (2011)13.6km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Gem, Lapidary, and Mineral Society of Montgomery County, MD., Inc.Rockville, Maryland46km
Mindat Locality ID:
104175
Long-form identifier:
mindat:1:2:104175:3
GUID (UUID V4):
0


Commodities (Major) - Marble - Dimension
Development Status: Past Producer

This small quarry, one of 2 shown in the immediate area by Parker (1968), is more important geologically than mineralogically. Both quarries were in low grade metacarbonate rock interpreted by Hebert, et al (2010) to be a “cap carbonate”. “Cap carbonate” rocks occur at the top of glacial sequences and mark the end of a glacial episode. In the Goose Creek area the marble immediately underlies the basal flow of the Catoctin basalts. The onset of Catoctin volcanism has been dated at 571 mybp.

At this quarry pillows of basalt pushed downward into the carbonate mud. Some carbonate, incorporated into the basal few inches of the basalt was more intensely metamorphosed than the carbonate that was simply overridden. Reaction rims in carbonate masses within the basalt contain grossular and several other minerals.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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


Mineral List


6 valid minerals.

Detailed Mineral List:

ⓘ Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘ Calcite
Formula: CaCO3
ⓘ 'Chlorite Group'
ⓘ Dolomite
Formula: CaMg(CO3)2
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Grossular
Formula: Ca3Al2(SiO4)3
ⓘ Magnetite
Formula: Fe2+Fe3+2O4

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘDolomite5.AB.10CaMg(CO3)2
Group 9 - Silicates
ⓘGrossular9.AD.25Ca3Al2(SiO4)3
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘActinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Unclassified
ⓘ'Chlorite Group'-

List of minerals for each chemical element

HHydrogen
Hⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
CCarbon
Cⓘ CalciteCaCO3
Cⓘ DolomiteCaMg(CO3)2
OOxygen
Oⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oⓘ CalciteCaCO3
Oⓘ DolomiteCaMg(CO3)2
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ GrossularCa3Al2(SiO4)3
Oⓘ MagnetiteFe2+Fe23+O4
MgMagnesium
Mgⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Mgⓘ DolomiteCaMg(CO3)2
AlAluminium
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ GrossularCa3Al2(SiO4)3
SiSilicon
Siⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ GrossularCa3Al2(SiO4)3
CaCalcium
Caⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caⓘ CalciteCaCO3
Caⓘ DolomiteCaMg(CO3)2
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ GrossularCa3Al2(SiO4)3
FeIron
Feⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ MagnetiteFe2+Fe23+O4

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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