Club	Location	Distance
Gem, Lapidary, and Mineral Society of Montgomery County, MD., Inc.	Rockville, Maryland	14km
Northern Virginia Mineral Club, Inc.	Arlington, Virginia	16km
Gem and Mineral Hunters, Inc.	Manassas, Virginia	32km
Southern Maryland Rock and Mineral Club	Clinton, Maryland	38km
American Fossil Federation	Bowie, Maryland	45km

Near Potomac River
Ref: Minerals of Virginia

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

9 valid minerals.

Detailed Mineral List:

ⓘ 'Allanite Group'

Formula: {A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ Andalusite

Formula: Al₂(SiO₄)O

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ Andalusite var. Chiastolite

Formula: Al₂(SiO₄)O

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ Calcite

Formula: CaCO₃

Reference: Minerals of Virginia, 1990 by R. V. Dietrich

ⓘ 'Chlorite Group'

Reference: Minerals of Virginia, 1990 by R. V. Dietrich

ⓘ Epidote

Formula: {Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)

Reference: Minerals of Virginia, 1990 by R. V. Dietrich

ⓘ Hematite

Formula: Fe₂O₃

Reference: Minerals of Virginia, 1990 by R. V. Dietrich

ⓘ Hematite var. Specularite

Formula: Fe₂O₃

Reference: Minerals of Virginia, 1990 by R. V. Dietrich

ⓘ Kyanite

Formula: Al₂(SiO₄)O

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

Reference: Minerals of Virginia, 1990 by R. V. Dietrich

ⓘ Pyrite

Formula: FeS₂

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ Quartz

Formula: SiO₂

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ Sillimanite

Formula: Al₂(SiO₄)O

Reference: Minerals of Virginia 1990 by R. V. Dietrich

ⓘ 'Tourmaline'

Formula: AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

Reference: Minerals of Virginia 1990 by R. V. Dietrich

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 4 - Oxides and Hydroxides
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	var. Specularite	4.CB.05	Fe₂O₃
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Andalusite	9.AF.10	Al₂(SiO₄)O
ⓘ	var. Chiastolite	9.AF.10	Al₂(SiO₄)O
ⓘ	Epidote	9.BG.05a	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
ⓘ	Kyanite	9.AF.15	Al₂(SiO₄)O
ⓘ	Sillimanite	9.AF.05	Al₂(SiO₄)O
Unclassified Minerals, Rocks, etc.
ⓘ	'Allanite Group'	-	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Chlorite Group'	-
ⓘ	'Tourmaline'	-	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Allanite Group	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
H	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
B	Boron
B	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Quartz	SiO₂
O	ⓘ Allanite Group	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Kyanite	Al₂(SiO₄)O
O	ⓘ Andalusite var. Chiastolite	Al₂(SiO₄)O
O	ⓘ Calcite	CaCO₃
O	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
O	ⓘ Hematite var. Specularite	Fe₂O₃
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
O	ⓘ Sillimanite	Al₂(SiO₄)O
O	ⓘ Andalusite	Al₂(SiO₄)O
O	ⓘ Hematite	Fe₂O₃
F	Fluorine
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Al	Aluminium
Al	ⓘ Kyanite	Al₂(SiO₄)O
Al	ⓘ Andalusite var. Chiastolite	Al₂(SiO₄)O
Al	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Al	ⓘ Sillimanite	Al₂(SiO₄)O
Al	ⓘ Andalusite	Al₂(SiO₄)O
Si	Silicon
Si	ⓘ Quartz	SiO₂
Si	ⓘ Allanite Group	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
Si	ⓘ Kyanite	Al₂(SiO₄)O
Si	ⓘ Andalusite var. Chiastolite	Al₂(SiO₄)O
Si	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Si	ⓘ Sillimanite	Al₂(SiO₄)O
Si	ⓘ Andalusite	Al₂(SiO₄)O
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Pyrite	FeS₂
Cl	Chlorine
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	Calcium
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Fe	Iron
Fe	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Fe	ⓘ Hematite var. Specularite	Fe₂O₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Hematite	Fe₂O₃

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Piedmontia DomainDomain

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Difficult Run, Fairfax Co., Virginia, USAiRegional Level TypesDifficult Run- not defined - Fairfax Co.County VirginiaState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

Difficult Run, Fairfax Co., Virginia, USA i
Regional Level Types
Difficult Run - not defined -
Fairfax Co. County
Virginia State
USA Country