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:
Calhoun Co., Michigan, USA

mindat Locality ID: 125403
mindat URL: http://www.mindat.org/loc-125403.html

Tectonic Settings:

Total number of sublocalities beneath "Calhoun Co., Michigan, USA": 4
Total number of bottom-level sublocalities: 4

Number of Child Localities: 4
Child Localities:
Alpha Portland Cement Company Clay Pit
Battle Creek
David Allwood Pit (David Alwood)
William Case Marl Pit

Latitude: 42°12'1"N
Longitude: 85°5'51"W
Decimal Degree (lat, lon): 42.200277777778,-85.0975

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.

Calcite	Clay	Diaspore	Marcasite	None	Not in a structural group	Pyrite	Rocksalt	Rutile	Smectite-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 Cl Fe H Mg Mn Na O S Si

Elements from minerals reported directly at this locality: Al Ca Cl H Mg Na O S Si

Structural Groups for minerals in this locality:
Calcite Clay Diaspore Marcasite None Not in a structural group Pyrite Rocksalt Rutile Smectite-vermiculite

9 IMA Minerals at location:

Anhydrite ()*	Calcite ()*	Goethite ()*	Halite ()*	Marcasite ()*
Montmorillonite ()*	Pyrite ()*	Pyrolusite ()*	Romanèchite ()*

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Anhydrite ()*	Not in a structural group	Ca(SO₄)	0		1588
Calcite ()*	Calcite	Ca(CO₃)	1	220120	27770
Goethite ()*	Diaspore	FeO(OH)	1	220120	7437
Halite ()*	Rocksalt	NaCl	0		1398
Marcasite ()*	Marcasite	FeS₂	1	220120	5674
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O	0		1508
Pyrite ()*	Pyrite	FeS₂	1	220120	39462
Pyrolusite ()*	Rutile	MnO₂	1	220120	3106
Romanèchite ()*	None	(Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀	1	220120	312

No ages have been assigned to this locality yet.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...