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:
Ruri Complex, Homa Bay County, Kenya

Oldest recorded age at locality: 11
Youngest recorded age at locality: 4.1

mindat Locality ID: 227741
mindat URL: http://www.mindat.org/loc-227741.html

Tectonic Settings:

Total number of sublocalities beneath "Ruri Complex, Homa Bay County, Kenya": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
North Ruri
South Ruri

Latitude: 0°-31'-48"N
Longitude: 34°20'3"E
Decimal Degree (lat, lon): -0.53,34.334166666667

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	Baryte	Calcite	Cancrinite	Eudialyte	Fluorite	None	Pyroxene	Spinel	Tridymite
Wollastonite

Aegirine ()*	Aegirine-augite ()*	Arfvedsonite ()*	Baryte ()*	Calcite ()*
Cancrinite ()*	Eudialyte ()*	Fluorite ()*	Götzenite ()*	Magnesio-arfvedsonite ()*
Magnetite ()*	Nepheline ()*	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 Cl F Fe H K Mg Na O S Si Ti Zr

Elements from minerals reported directly at this locality: Al Ba C Ca Cl F Fe H Na O S Si Ti Zr

Structural Groups for minerals in this locality:
Amphibole Baryte Calcite Cancrinite Eudialyte Fluorite None Pyroxene Spinel Tridymite
Wollastonite

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
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	11	4.1	2	77657,77658	1022
Aegirine-augite ()*	Pyroxene	(Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆	11	4.1	1	77657	286
Arfvedsonite ()*	Amphibole	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	11	4.1	1	77657	295
Baryte ()*	Baryte	Ba(SO₄)	11	4.1	0		11547
Calcite ()*	Calcite	Ca(CO₃)	11	4.1	1	77657	27770
Cancrinite ()*	Cancrinite	(Na,Ca, )₈(Al₆Si₆)O₂₄(CO₃,SO₄)₂·2H₂O	11	4.1	0		232
Eudialyte ()*	Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂	11	4.1	0		182
Fluorite ()*	Fluorite	CaF₂	11	4.1	0		9617
Götzenite ()*	None	Ca₄NaCa₂Ti(Si₂O₇)₂(OF)F₂	11	4.1	0		27
Magnesio-arfvedsonite ()*	Amphibole	NaNa₂(Mg₄Fe³⁺)Si₈O₂₂(OH)₂	11	4.1	1	77657	79
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	11	4.1	0		14899
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	11	4.1	2	77657,77658	884
Wollastonite ()*	Wollastonite	CaSiO₃	11	4.1	0		1247

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Jen_0000410	carbonatite complex
Jen_0000594	MAGMATIC STYLE: Adjacent, deeply eroded volcanic complexes with cone sheets, dykes and many irregular intrusions. Also extrusive and intrusive tuffs and agglomerates. ASSOCIATED SILICATE ROCKS: Nepheline syenite, phonolite and melanephelinite; ijolite blocks in agglomerates; fenite.
Jen_0000595	MAGMATIC STYLE: Adjacent, deeply eroded volcanic complexes with cone sheets, dykes and many irregular intrusions. Also extrusive and intrusive tuffs and agglomerates. ASSOCIATED SILICATE ROCKS: Nepheline syenite, phonolite and melanephelinite; ijolite blocks in agglomerates; fenite.

4 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_0000410	11	4.1	11-4.1	K-Ar		227741	Ruri Complex, Homa Bay County, Kenya	North and South Ruri	Ernst and Bell (2010)	10.1007/s00710-009-0074-1	MP98_55
Jen_0000594	7.5	7.5	7.5	K-Ar	whole rock	227741	Ruri Complex, Homa Bay County, Kenya	North and South Ruri	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796
Jen_0000595	11	4.1	11-4.1	K-Ar	whole rock	227741	Ruri Complex, Homa Bay County, Kenya	North and South Ruri	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796
ree-00397	11	4.1	4.1-11 Ma			227741	Ruri Complex, Homa Bay County, Kenya	Ruri Complex	Orris and Grauch (2002)		USGSOFR02_189

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...