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:
Acton District, Los Angeles Co., California, USA

Oldest recorded age at locality: 17.5
Youngest recorded age at locality: 16.5

mindat Locality ID: 3492
mindat URL: http://www.mindat.org/loc-3492.html

Tectonic Settings:

Total number of sublocalities beneath "Acton District, Los Angeles Co., California, USA": 31
Total number of bottom-level sublocalities: 26

Number of Child Localities: 1
Child Localities:
Acton

Latitude: 34°28'14"N
Longitude: 118°12'52"W
Decimal Degree (lat, lon): 34.470555555556,-118.21444444444

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.

Amorphous	Calcite	Chalcopyrite	Clay	Copper	Garnet	Malachite	Mica	None	Not in a structural group
Quartz	Titanite

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 Au C Ca Cu Fe H K O S Si Ti

Elements from minerals reported directly at this locality: Al Au Fe H K O Si

Structural Groups for minerals in this locality:
Amorphous Calcite Chalcopyrite Clay Copper Garnet Malachite Mica None Not in a structural group
Quartz Titanite

12 IMA Minerals at location:

Almandine ()*	Azurite ()*	Bornite ()*	Calcite ()*	Chalcocite ()*
Chalcopyrite ()*	Gold ()*	Malachite ()*	Muscovite ()*	Opal ()*
Quartz ()*	Titanite ()*

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
Almandine ()*	Garnet	Fe²⁺₃Al₂(SiO₄)₃	17.5	16.5	0		2353
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂			1	161076	5509
Bornite ()*	None	Cu₅FeS₄			2	161058,161076	5516
Calcite ()*	Calcite	Ca(CO₃)			1	161075	27770
Chalcocite ()*	None	Cu₂S			1	161076	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			1	161076	27198
Gold ()*	Copper	Au	17.5	16.5	0		30554
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂			2	161058,161076	12537
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	17.5	16.5	0		17380
Opal ()*	Amorphous	SiO₂·nH₂O	17.5	16.5	1	161053	2994
Quartz ()*	Quartz	SiO₂	17.5	16.5	3	161053,161058,161068	61156
Titanite ()*	Titanite	CaTi(SiO₄)O			1	161076	4899

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
	NAVDAT-31416	17.5	16.5	17±0.5				whole rock	31416						81190	Collecting Site Mine, Antelope Valley, Acton, Acton District, Los Angeles Co., California, USA		NAVDAT		NAVDAT

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...