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:
Patapsco Mines, Finksburg, Sykesville, Carroll Co., Maryland, USA

Oldest recorded age at locality: 540
Youngest recorded age at locality: 444

mindat Locality ID: 253760
mindat URL: http://www.mindat.org/loc-253760.html

Tectonic Settings:

Total number of sublocalities beneath "Patapsco Mines, Finksburg, Sykesville, Carroll Co., Maryland, USA": 4
Total number of bottom-level sublocalities: 4

Number of Child Localities: 4
Child Localities:
Elms Farm
Patapsco Mine (Finksburg Mine; Orchard Mine)
Patapsco Mine East Adit
Wildesen Mine

Latitude: 39°29'21"N
Longitude: 76°52'37"W
Decimal Degree (lat, lon): 39.489166666667,-76.876944444444

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.

Chalcopyrite	Corundum	Covellite	None	Pyrite	Sphalerite	Spinel

Carrollite ()*	Chalcocite ()*	Chalcopyrite ()*	Chromite ()*	Covellite ()*
Gahnite ()*	Hematite ()*	Linnaeite ()*	Magnetite ()*	Pyrite ()*
Siegenite ()*	Sphalerite ()*	Violarite ()*

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 Co Cr Cu Fe Ni O S Zn

Elements from minerals reported directly at this locality: Co Fe Ni S

Structural Groups for minerals in this locality:
Chalcopyrite Corundum Covellite None Pyrite Sphalerite Spinel

13 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
Carrollite ()*	Spinel	CuCo₂S₄	540	444	2	218637,218639	154
Chalcocite ()*	None	Cu₂S	540	444	1	218637	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	540	444	2	218637,218639	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	540	444	1	218637	3902
Covellite ()*	Covellite	CuS	540	444	1	218637	4165
Gahnite ()*	Spinel	ZnAl₂O₄	540	444	1	218637	445
Hematite ()*	Corundum	Fe₂O₃	540	444	1	218637	14640
Linnaeite ()*	Spinel	Co²⁺Co³⁺₂S₄	540	444	1	218637	249
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	540	444	2	218637,218639	14899
Pyrite ()*	Pyrite	FeS₂	540	444	1	218639	39462
Siegenite ()*	Spinel	CoNi₂S₄	540	444	0		249
Sphalerite ()*	Sphalerite	ZnS	540	444	1	218637	21482
Violarite ()*	Spinel	FeNi₂S₄	540	444	0		380

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Emily000556	540	444	Cambrian-Ordovician							Yes				24179	Sykesville, Carroll Co., Maryland, USA	Sykesville	Rast and Horton (1989)	10.1130/SPE228-p1	GSA288_1
	Emily000557	488	470	479±9				zircon			Yes	Zircon	Zircon		24179	Sykesville, Carroll Co., Maryland, USA	Sykesville	Horton et al. (2010)	10.1130/2010.1206(25)	GSA206_621

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...