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:
Homa Mountain Complex, Homa Bay County, Kenya

Oldest recorded age at locality: 12
Youngest recorded age at locality: 1.3

mindat Locality ID: 209290
mindat URL: http://www.mindat.org/loc-209290.html

Tectonic Settings:

Total number of sublocalities beneath "Homa Mountain Complex, Homa Bay County, Kenya": 0
Total number of bottom-level sublocalities: 0

Latitude: 0°-23'0"N
Longitude: 34°30'0"E
Decimal Degree (lat, lon): -0.38333333333333,34.5

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	Baryte	Calcite	Feldspar	Garnet	None	Pyroxene	Spinel	Titanite
Tridymite	Wollastonite

Aegirine ()*	Albite ()*	Andradite ()*	Baryte ()*	Calcite ()*
Hydroxylapatite ()*	Magnesio-arfvedsonite ()*	Magnetite ()*	Microcline ()*	Nepheline ()*
Richterite ()*	Titanite ()*	Wollastonite ()*

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 Fe H K Mg Na O P S Si Ti

Elements from minerals reported directly at this locality: Al Ba C Ca Fe H K Mg Na O P S Si Ti

Structural Groups for minerals in this locality:
Amphibole Apatite Baryte Calcite Feldspar Garnet None Pyroxene Spinel Titanite
Tridymite Wollastonite

13 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	12	1.3	1022
Albite ()*	Feldspar	Na(AlSi₃O₈)	12	1.3	8803
Andradite ()*	Garnet	Ca₃Fe³⁺₂(SiO₄)₃	12	1.3	1534
Baryte ()*	Baryte	Ba(SO₄)	12	1.3	11547
Calcite ()*	Calcite	Ca(CO₃)	12	1.3	27770
Hydroxylapatite ()*	Apatite	Ca₅(PO₄)₃OH	12	1.3	367
Magnesio-arfvedsonite ()*	Amphibole	NaNa₂(Mg₄Fe³⁺)Si₈O₂₂(OH)₂	12	1.3	79
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	12	1.3	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)	12	1.3	4924
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	12	1.3	884
Richterite ()*	Amphibole	Na(NaCa)Mg₅Si₈O₂₂(OH)₂	12	1.3	148
Titanite ()*	Titanite	CaTi(SiO₄)O	12	1.3	4899
Wollastonite ()*	Wollastonite	CaSiO₃	12	1.3	1247

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Jen_0000407	carbonatite complex
Jen_0000592	MAGMATIC STYLE: Cone sheets, dykes, veins and extrusive pyroclastic deposits including bedded tuffs. ASSOCIATED SILICATE ROCKS: Ijolite, phonolite, nephelinite, breccia and fenite.
Jen_0000593	MAGMATIC STYLE: Cone sheets, dykes, veins and extrusive pyroclastic deposits including bedded tuffs. ASSOCIATED SILICATE ROCKS: Ijolite, phonolite, nephelinite, breccia and fenite.

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID
Jen_0000407	12	1.3	12-1.3	K-Ar		209290	Homa Mountain Complex, Homa Bay County, Kenya	Homa Mountain Complex	Ernst and Bell (2010)	10.1007/s00710-009-0074-1	MP98_55
Jen_0000592	6.6	6.6	6.6	K-Ar	whole rock, biotite	209290	Homa Mountain Complex, Homa Bay County, Kenya	Homa Mountain	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796
Jen_0000593	12	1.3	12-1.3	K-Ar	whole rock, biotite	209290	Homa Mountain Complex, Homa Bay County, Kenya	Homa Mountain	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...