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:
Johnson Co., Nebraska, USA

Oldest recorded age at locality: 323
Youngest recorded age at locality: 323

mindat Locality ID: 46628
mindat URL: http://www.mindat.org/loc-46628.html

Tectonic Settings:

Total number of sublocalities beneath "Johnson Co., Nebraska, USA": 4
Total number of bottom-level sublocalities: 3

Number of Child Localities: 2
Child Localities:
Elk Creek
Tecumseh

Latitude: 40°19'15"N
Longitude: 96°11'20"W
Decimal Degree (lat, lon): 40.320833333333,-96.188888888889

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.

Apatite	Baryte	Calcite	Chalcopyrite	Chlorite	Clay	Corundum	Diaspore	Fluorite	Kaolinite
Marcasite	Mica	None	Not in a structural group	Pyrite	Quartz	Rocksalt	Rutile	Smectite-vermiculite	Sphalerite
Spinel	Tridymite

Anatase ()*	Ankerite ()*	Baryte ()*	Calcite ()*	Chalcopyrite ()*
Clinochlore ()*	Dolomite ()*	Fluorapatite ()*	Fluorite ()*	Galena ()*
Goethite ()*	Hematite ()*	Ilmenite ()*	Kaolinite ()*	Magnetite ()*
Marcasite ()*	Muscovite ()*	Nepheline ()*	Phlogopite ()*	Pyrite ()*
Quartz ()*	Rutile ()*	Sphalerite ()*	Vermiculite ()*

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 Ba C Ca Cu F Fe H K Mg Na O P Pb S Si Ti Zn

Elements from minerals reported directly at this locality: Fe S

Structural Groups for minerals in this locality:
Apatite Baryte Calcite Chalcopyrite Chlorite Clay Corundum Diaspore Fluorite Kaolinite
Marcasite Mica None Not in a structural group Pyrite Quartz Rocksalt Rutile Smectite-vermiculite Sphalerite
Spinel Tridymite

24 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
Anatase ()*	Not in a structural group	TiO₂	323	323	1	234447	2162
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂	323	323	2	234446,234447	3092
Baryte ()*	Baryte	Ba(SO₄)	323	323	2	234446,234447	11547
Calcite ()*	Calcite	Ca(CO₃)	323	323	1	234447	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	323	323	2	234446,234447	27198
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈	323	323	1	234447	1756
Dolomite ()*	None	CaMg(CO₃)₂	323	323	2	234446,234447	9895
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F	323	323	1	234447	2740
Fluorite ()*	Fluorite	CaF₂	323	323	2	234446,234447	9617
Galena ()*	Rocksalt	PbS	323	323	2	234446,234447	24243
Goethite ()*	Diaspore	FeO(OH)	323	323	1	234447	7437
Hematite ()*	Corundum	Fe₂O₃	323	323	2	234446,234447	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	323	323	1	234447	5433
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄	323	323	1	234446	5591
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	323	323	1	234447	14899
Marcasite ()*	Marcasite	FeS₂	323	323	0		5674
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	323	323	2	234446,234447	17380
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	323	323	1	234447	884
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂	323	323	2	234446,234447	2273
Pyrite ()*	Pyrite	FeS₂	323	323	2	234446,234447	39462
Quartz ()*	Quartz	SiO₂	323	323	3	234446,234447,234449	61156
Rutile ()*	Rutile	TiO₂	323	323	1	234447	5614
Sphalerite ()*	Sphalerite	ZnS	323	323	2	234446,234447	21482
Vermiculite ()*	Clay Smectite-vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄·8H₂O	323	323	1	234446	652

1 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
	ree-00656	323	323	Pre- Pennsylvanian											219396	Elk Creek Carbonatite, Elk Creek, Johnson Co., Nebraska, USA	Elk Creek	Orris and Grauch (2002)		USGSOFR02_189

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...