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Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA i
Regional Level Types
Martin Marietta Texas Quarry Quarry (Active)
Cockeysville Census-designated Place
Baltimore County County
Maryland State
USA Country

Regional Level Types
Martin Marietta Texas Quarry	Quarry (Active)
Cockeysville	Census-designated Place
Baltimore County	County
Maryland	State
USA	Country

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H. T. Campbell Quarry - Spring, 1978

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - 1967

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - Spring, 1967

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - Spring, 1978

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - 1967

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - Spring, 1967

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - Spring, 1978

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

H. T. Campbell Quarry - 1967

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

Latitude & Longitude (WGS84):

39° 28' 0'' North , 76° 39' 3'' West

Latitude & Longitude (decimal):

39.46667,-76.65111

GRN:

N27W43

Type:

Quarry (Active) - last checked 2026

Deposit first discovered:

1926 (approx.)

Köppen climate type:

Cfa : Humid subtropical climate

Nearest Settlements:

Place	Population	Distance
Cockeysville	20,776 (2011)	1.7km
Mays Chapel	11,420 (2011)	3.7km
Hunt Valley	23,915 (2012)	3.8km
Timonium	9,925 (2011)	4.3km
Lutherville-Timonium	15,814 (2017)	4.5km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Baltimore Mineral Society	Baltimore, Maryland	20km
Chesapeake Gem & Mineral Society	Baltimore, Maryland	20km
Gem Cutters Guild of Baltimore, Inc.	Baltimore, Maryland	20km
Central Maryland Rock and Mineral Collectors Exchange	Elkridge, Maryland	29km
Mason-Dixon Rock, Mineral, Gemological, & Lapidary Club	Hanover, Pennsylvania	47km

Mindat Locality ID:

9024

Long-form identifier:

mindat:1:2:9024:0

GUID (UUID V4):

Other/historical names associated with this locality:

Bluegrass Company Quarry; H.T. Campbell Quarry; Campbell Quarry; Texas Quarry

Quarrying commenced at the site in 1926.
Known for its limestone and marble.

Underground quarrying was also conducted in the quarry and to the areas northeast, east and southeast of the main pit.

A large quarry in the Cockeysville Marble, located near Cockeysville. Rock includes a finer dolomitic marble and coarser grained calcite marble. There are also calc-silicate zones and pegmatite pods.

Operated by Martin Marietta (2026).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

22 valid minerals.

Detailed Mineral List:

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃A

References:

Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.

ⓘ 'Asbestos'

References:

Rocks & Min.: 21:274-275.

ⓘ 'Asbestos var. Mountain Leather'

References:

Rocks & Min.: 21:274-275.

ⓘ Baryte

Formula: BaSO₄

References:

Rocks & Min.: 21:274-275.

ⓘ Calcite

Formula: CaCO₃

References:

Rocks & Min.:12:247

21:274-275.

ⓘ 'Chlorite Group'

References:

ⓘ Diopside

Formula: CaMgSi₂O₆

References:

ⓘ Dolomite

Formula: CaMg(CO₃)₂

References:

Rocks & Min.: 21:274-275.

ⓘ Dravite

Formula: NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

References:

Rocks & Min.: 21:274-275.

ⓘ Fluorite

Formula: CaF₂

References:

Rocks & Min.:12:247.

ⓘ Galena

Formula: PbS

References:

ⓘ Graphite

Formula: C

References:

ⓘ 'Limonite'

References:

ⓘ Margarite

Formula: CaAl₂(Al₂Si₂O₁₀)(OH)₂

References:

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

ⓘ Molybdenite ?

Formula: MoS₂

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

Rocks & Min.: 21:274-275.

ⓘ Muscovite var. Fuchsite

Formula: K(Al,Cr)₃Si₃O₁₀(OH)₂

References:

Rocks & Min.: 21:274-275.

ⓘ Phlogopite

Formula: KMg₃(AlSi₃O₁₀)(OH)₂

References:

Rocks & Min.: 12:247

21:274-275.

ⓘ Pyrite

Formula: FeS₂

References:

Rocks & Min.: 12:247

21:274-275.

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

Rocks & Min.: 21:274-275.

ⓘ Quartz

Formula: SiO₂

References:

Rocks & Min.:12:247.

ⓘ Quartz var. Smoky Quartz

Formula: SiO₂

References:

Rocks & Min.: 21:274-275.

ⓘ Rutile

Formula: TiO₂

References:

Bernstein, Lawrence R. (1976) Minerals of Washington, D.C. and vicinity. Open-File Report Vol. 76-849. US Geological Survey doi:10.3133/ofr76849

ⓘ 'Scapolite'

Colour: Gray and purple

References:

Rocks & Min.: 12:247

21:274-275.

ⓘ 'Scapolite var. Wernerite'

Colour: Gray and purple

References:

Rocks & Min.: 12:247

21:274-275.

ⓘ 'Serpentine Subgroup'

Formula: D₃[Si₂O₅](OH)₄

References:

ⓘ Sphalerite

Formula: ZnS

References:

Rocks & Min.:12:247.

ⓘ Talc

Formula: Mg₃Si₄O₁₀(OH)₂

References:

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

Rocks & Min.: 12:247

21:274-275.

ⓘ Tremolite

Formula: ◻Ca₂Mg₅(Si₈O₂₂)(OH)₂

References:

Rocks & Min.: 12:247

21:274-275.

ⓘ Wollastonite

Formula: Ca₃(Si₃O₉)

References:

Bernstein, Lawrence R. (1976) Minerals of Washington, D.C. and vicinity. Open-File Report Vol. 76-849. US Geological Survey doi:10.3133/ofr76849

Gallery:

CaMgSi₂O₆ⓘ Diopside

Diopside

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

Diopside

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

Diopside

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)ⓘ Dravite

Dravite, etc.

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

Dravite, etc.

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

Dravite, etc.

Martin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Graphite	1.CB.05a	C
Group 2 - Sulphides and Sulfosalts
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Galena	2.CD.10	PbS
ⓘ	Molybdenite ?	2.EA.30	MoS₂
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	var. Smoky Quartz	4.DA.05	SiO₂
ⓘ	Rutile	4.DB.05	TiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Dolomite	5.AB.10	CaMg(CO₃)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Dravite	9.CK.05	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Tremolite	9.DE.10	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
ⓘ	Wollastonite	9.DG.05	Ca₃(Si₃O₉)
ⓘ	Talc	9.EC.05	Mg₃Si₄O₁₀(OH)₂
ⓘ	Muscovite var. Fuchsite	9.EC.15	K(Al,Cr)₃Si₃O₁₀(OH)₂
ⓘ		9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Phlogopite	9.EC.20	KMg₃(AlSi₃O₁₀)(OH)₂
ⓘ	Margarite	9.EC.30	CaAl₂(Al₂Si₂O₁₀)(OH)₂
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
Unclassified
ⓘ	'Asbestos'	-
ⓘ	'Chlorite Group'	-
ⓘ	'Limonite'	-
ⓘ	'Scapolite var. Wernerite'	-
ⓘ	''	-
ⓘ	'Asbestos var. Mountain Leather'	-
ⓘ	'Serpentine Subgroup'	-	D₃[Si₂O₅](OH)₄
ⓘ	'Apatite'	-	Ca₅(PO₄)₃A

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
H	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
H	ⓘ Margarite	CaAl₂(Al₂Si₂O₁₀)(OH)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
H	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
H	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
H	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
B	Boron
B	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Dolomite	CaMg(CO₃)₂
C	ⓘ Graphite	C
C	ⓘ Scapolite var. Wernerite
O	Oxygen
O	ⓘ Baryte	BaSO₄
O	ⓘ Calcite	CaCO₃
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Dolomite	CaMg(CO₃)₂
O	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
O	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
O	ⓘ Margarite	CaAl₂(Al₂Si₂O₁₀)(OH)₂
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Rutile	TiO₂
O	ⓘ Quartz var. Smoky Quartz	SiO₂
O	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
O	ⓘ Scapolite var. Wernerite
O	ⓘ Wollastonite	Ca₃(Si₃O₉)
O	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
O	ⓘ Apatite	Ca₅(PO₄)₃A
F	Fluorine
F	ⓘ Fluorite	CaF₂
Na	Sodium
Na	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Na	ⓘ Scapolite var. Wernerite
Mg	Magnesium
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Dolomite	CaMg(CO₃)₂
Mg	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Mg	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Mg	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Mg	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Al	Aluminium
Al	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
Al	ⓘ Margarite	CaAl₂(Al₂Si₂O₁₀)(OH)₂
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Al	ⓘ Scapolite var. Wernerite
Si	Silicon
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Dravite	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Si	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
Si	ⓘ Margarite	CaAl₂(Al₂Si₂O₁₀)(OH)₂
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Quartz var. Smoky Quartz	SiO₂
Si	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Si	ⓘ Scapolite var. Wernerite
Si	ⓘ Wollastonite	Ca₃(Si₃O₉)
Si	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃A
S	Sulfur
S	ⓘ Baryte	BaSO₄
S	ⓘ Galena	PbS
S	ⓘ Molybdenite	MoS₂
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Sphalerite	ZnS
Cl	Chlorine
Cl	ⓘ Scapolite var. Wernerite
K	Potassium
K	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
K	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Dolomite	CaMg(CO₃)₂
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Margarite	CaAl₂(Al₂Si₂O₁₀)(OH)₂
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Ca	ⓘ Scapolite var. Wernerite
Ca	ⓘ Wollastonite	Ca₃(Si₃O₉)
Ca	ⓘ Apatite	Ca₅(PO₄)₃A
Ti	Titanium
Ti	ⓘ Rutile	TiO₂
Ti	ⓘ Titanite	CaTi(SiO₄)O
Cr	Chromium
Cr	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
Fe	Iron
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Mo	Molybdenum
Mo	ⓘ Molybdenite	MoS₂
Ba	Barium
Ba	ⓘ Baryte	BaSO₄
Pb	Lead
Pb	ⓘ Galena	PbS

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

PedmontiaAccretionary Complex
Piedmontia DomainDomain

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Jones, H. & W. Price (1937) R. & M. A. outing in Maryland: Rocks and Minerals: 12 (5): 247.

Ostrander, Charles W., Price, Jr, Walter E. (1940) Minerals of Maryland. The Natural History Society of Maryland, Baltimore, Maryland, USA. 14pp.

Leavey, H. (1946) Minerals of the H.T. Campbell Quarry of Texas, Md: Rocks and Minerals: 21 (5): 274-275.

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