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:
North Ruri, Ruri Complex, Homa Bay County, Kenya

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

mindat Locality ID: 209291
mindat URL: http://www.mindat.org/loc-209291.html

Tectonic Settings:

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

Latitude: 0°0'0"N
Longitude: 0°0'0"E
Decimal Degree (lat, lon): 0,0

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	Calcite	None	Pyroxene	Tridymite

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 C Ca Fe H K Mg Na O Si

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

Structural Groups for minerals in this locality:
Amphibole Calcite None Pyroxene Tridymite

6 IMA Minerals at location:

Aegirine ()*	Aegirine-augite ()*	Arfvedsonite ()*	Calcite ()*	Magnesio-arfvedsonite ()*
Nepheline ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	11	4.1	1022
Aegirine-augite ()*	Pyroxene	(Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆	11	4.1	286
Arfvedsonite ()*	Amphibole	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	11	4.1	295
Calcite ()*	Calcite	Ca(CO₃)	11	4.1	27770
Magnesio-arfvedsonite ()*	Amphibole	NaNa₂(Mg₄Fe³⁺)Si₈O₂₂(OH)₂	11	4.1	79
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	11	4.1	884

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.

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	Age from other Locality	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		Yes	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	Yes	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	Yes	227741	Ruri Complex, Homa Bay County, Kenya	North and South Ruri	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...