Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.

Locality Name:
Howard Co., Maryland, USA

Oldest recorded age at locality: 1231.5
Youngest recorded age at locality: 938

mindat Locality ID: 26593
mindat URL: http://www.mindat.org/loc-26593.html

Tectonic Settings:

Total number of sublocalities beneath "Howard Co., Maryland, USA": 85
Total number of bottom-level sublocalities: 74

Number of Child Localities: 67
Child Localities:
Albert Sandusky Quarries
Arlington No. 1 Quarry
Arlington No. 2 Quarry
Atholton
Baltimore Feldspar Company Quarries (1)
Baltimore Feldspar Company Quarry (2)
Baugh And Sons Company Quarry
Biddison Pegmatite Deposit
Brighton Dam Road Quarry (Howard-Montgomery Quarry)
Brooks Ore Bank
Brown Ore Banks
Brown Quarries
Carrolls Mill
Clarksville
Columbia Area
Cooksville
Cordy Quarry
Daniels (Alberton)
Davis
Dorseys Run Quarry No. 1
Dorseys Run Quarry No. 2
East Marriottsville Quarry
Ellicott City
Fagan Quarries
Feazer Quarry
Fisher And Carozza Quarries
Gary Quarry
Glenelg
Gudelsky Farm Prospect
Hanna Quarry
Harold Stromberg Quarry
Haslup Ore Bank
Highe Quarry No. 1
Highe Quarry No. 2
Hobbs Ore Bank
Ilchester
Marriottsville
Marriottsville Quarry
Mathews Quarry
Melvin Quarry
Melvin Quarry No. 1
Melvin Quarry No. 2
Moody Quarry
O'Connor Farm Quarries
Patapsco Quarry
Perry Quarries
Piccirilli Quarries (Marriotsville Quarry)
Pindell Quarries No. 1
Pindell Quarries No. 2
Pine Orchard
Product Sales Company Quarry
Rice Ore Bank (Rice Magnetite Mine)
Savage
Scaggsville
Shipley Quarry
Simpsonville
South Marriottsville Quarry
Streker Quarry
Talbott Ore Bank
Theis Quarry No. 1
Theis Quarry No. 2
Theis Quarry No. 3
Warfield Quarry
Wharton Quarry
Woodstock
Wright Quarry
Zepp Quarry

Latitude: 39°17'18"N
Longitude: 76°50'54"W
Decimal Degree (lat, lon): 39.288333333333,-76.848333333333

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
	This mineral's age has not yet been recorded.

Amphibole	Apatite	Autunite	Beryl	Calcite	Chalcopyrite	Clay	Clinozoisite	Copper	Corundum
Epidote	Feldspar	Garnet	Malachite	Mica	Nickeline	None	Not in a structural group	Pyrite	Pyrophyllite
Pyroxene	Quartz	Rocksalt	Rutile	Smectite-vermiculite	Spinel	Staurolite	Talc	Titanite	Tourmaline
Zircon

Actinolite ()*	Albite ()*	Anthophyllite ()*	Autunite ()*	Beryl ()*
Calcite ()*	Chalcopyrite ()*	Clinozoisite ()*	Diopside ()*	Dolomite ()*
Dravite ()*	Epidote ()*	Ferro-hornblende ()*	Fluorapatite ()*	Gahnite ()*
Galena ()*	Gold ()*	Hematite ()*	Ilmenite ()*	Kyanite ()*
Mackinawite ()*	Magnetite ()*	Malachite ()*	Microcline ()*	Muscovite ()*
Nontronite ()*	Orthoclase ()*	Phlogopite ()*	Pyrite ()*	Pyrophyllite ()*
Pyrrhotite ()*	Quartz ()*	Rutile ()*	Schorl ()*	Sillimanite ()*
Spessartine ()*	Staurolite ()*	Talc ()*	Titanite ()*	Tremolite ()*
Vermiculite ()*	Zircon ()*

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al Au B Be C Ca Cu F Fe H K Mg Mn Na Ni O P Pb S Si Ti U Zn Zr

Elements from minerals reported directly at this locality: Au

Structural Groups for minerals in this locality:
Amphibole Apatite Autunite Beryl Calcite Chalcopyrite Clay Clinozoisite Copper Corundum
Epidote Feldspar Garnet Malachite Mica Nickeline None Not in a structural group Pyrite Pyrophyllite
Pyroxene Quartz Rocksalt Rutile Smectite-vermiculite Spinel Staurolite Talc Titanite Tourmaline
Zircon

42 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂			2	218851,218895	3419
Albite ()*	Feldspar	Na(AlSi₃O₈)			4	218853,218859,218897,218904	8803
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂			1	218851	718
Autunite ()*	Autunite	Ca(UO₂)₂(PO₄)₂·10-12H₂O			2	218891,218897	1272
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈			3	218853,218897,218898	4286
Calcite ()*	Calcite	Ca(CO₃)			3	218840,218857,218895	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			2	218840,218857	27198
Clinozoisite ()*	Clinozoisite Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)			1	218853	1025
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	218853	4135
Dolomite ()*	None	CaMg(CO₃)₂			1	218840	9895
Dravite ()*	Tourmaline	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)			1	218840	648
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	1231.5	938	3	218835,218859,218913	8173
Ferro-hornblende ()*	Amphibole	Ca₂(Fe²⁺₄Al)(Si₇Al)O₂₂(OH)₂			1	218853	271
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F			1	218853	2740
Gahnite ()*	Spinel	ZnAl₂O₄			1	218897	445
Galena ()*	Rocksalt	PbS			1	218857	24243
Gold ()*	Copper	Au	1231.5	938	0		30554
Hematite ()*	Corundum	Fe₂O₃			2	218897,218903	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			1	218903	5433
Kyanite ()*	Not in a structural group	Al₂OSiO₄			2	218844,218878	1507
Mackinawite ()*	None	(Fe,Ni)_1+xS (x = 0-0.07)			1	218840	451
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			4	218889,218890,218893,218895	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂			1	218840	12537
Microcline ()*	Feldspar	K(AlSi₃O₈)			8	218832,218833,218853,218859,218873,218897,218903,218904	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			15	218832,218833,218840,218853,218859,218860,218873,218878,218885,218889,218890,218897,218898,218903,218904	17380
Nontronite ()*	Clay Smectite-vermiculite	Na_0.3Fe³⁺₂(Si,Al)₄O₁₀(OH)₂·nH₂O			1	218858	471
Orthoclase ()*	Feldspar	K(AlSi₃O₈)			1	218859	2349
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂			3	218840,218853,218875	2273
Pyrite ()*	Pyrite	FeS₂	1231.5	938	6	218840,218857,218878,218895,218903,218913	39462
Pyrophyllite ()*	Clay Pyrophyllite	Al₂Si₄O₁₀(OH)₂			1	218903	771
Pyrrhotite ()*	Nickeline	Fe₇S₈			2	218840,218853	9056
Quartz ()*	Quartz	SiO₂	1231.5	938	20	218832,218833,218835,218840,218845,218846,218853,218857,218859,218860,218873,218878,218885,218889,218890,218897,218900,218903,218904,218913	61156
Rutile ()*	Rutile	TiO₂			1	218840	5614
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)			9	218832,218833,218860,218873,218876,218885,218897,218900,218903	2705
Sillimanite ()*	Not in a structural group	Al₂SiO₅			1	218844	1516
Spessartine ()*	Garnet	Mn²⁺₃Al₂(SiO₄)₃			2	218835,218897	1214
Staurolite ()*	Staurolite	Fe²⁺₂Al₉Si₄O₂₃(OH)			1	218878	978
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂			3	218840,218875,218877	3337
Titanite ()*	Titanite	CaTi(SiO₄)O	1231.5	938	3	218853,218895,218913	4899
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂			2	218840,218875	2562
Vermiculite ()*	Clay Smectite-vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄·8H₂O			1	218875	652
Zircon ()*	Zircon	Zr(SiO₄)			2	218835,218859	5251

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
USGS-U-Th-Pb-00758_206_238	968	938	953±15	206_238	zircon	Zircon	43888	Woodstock, Howard Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00758_207_206	1231.5	1201.5	1216.5±15	207_206	zircon	Zircon	43888	Woodstock, Howard Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00758_207_235	1051.3	1021.3	1036.3±15	207_235	zircon	Zircon	43888	Woodstock, Howard Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...