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:
Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA

Oldest recorded age at locality: 1702
Youngest recorded age at locality: 1702

mindat Locality ID: 121185
mindat URL: http://www.mindat.org/loc-121185.html

Tectonic Settings:

Total number of sublocalities beneath "Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 43°43'60"N
Longitude: 103°30'"W
Decimal Degree (lat, lon): 43.733333333333,-103.5

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	Andalusite	Beryl	Clay	Corundum	Feldspar	Mica	None	Not in a structural group	Pyroxene
Quartz	Spinel	Staurolite

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 Be Fe H K Li Na O Si

Elements from minerals reported directly at this locality: Al Be Fe H K Li Na O Si

Structural Groups for minerals in this locality:
Amphibole Andalusite Beryl Clay Corundum Feldspar Mica None Not in a structural group Pyroxene
Quartz Spinel Staurolite

12 IMA Minerals at location:

Albite ()*	Andalusite ()*	Beryl ()*	Grunerite ()*	Hematite ()*
Magnetite ()*	Microcline ()*	Muscovite ()*	Quartz ()*	Sillimanite ()*
Spodumene ()*	Staurolite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Albite ()*	Feldspar	Na(AlSi₃O₈)	1702	1702	8803
Andalusite ()*	Andalusite	Al₂SiO₅	1702	1702	1310
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	1702	1702	4286
Grunerite ()*	Amphibole	Fe²⁺₂Fe²⁺₅Si₈O₂₂(OH)₂	1702	1702	223
Hematite ()*	Corundum	Fe₂O₃	1702	1702	14640
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1702	1702	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)	1702	1702	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	1702	1702	17380
Quartz ()*	Quartz	SiO₂	1702	1702	61156
Sillimanite ()*	Not in a structural group	Al₂SiO₅	1702	1702	1516
Spodumene ()*	Pyroxene	LiAlSi₂O₆	1702	1702	688
Staurolite ()*	Staurolite	Fe²⁺₂Al₉Si₄O₂₃(OH)	1702	1702	978

2 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
	Be-00046	1702	1702	1702			high				Yes		Faheyite	Be	45259	Roosevelt Group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA		Dahl and Foland (2008)	10.2138/am.2008.2633	AM93_1215
	Be-00023	1702	1702	1702			high				Yes		Ehrleite, Fransoletite, Greifensteinite, Pahasapaite, Parafransoletite, Roscherite, Tiptopite	Be	4122	Tip Top Mine (Tip Top Pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA		Dahl and Foland (2008)	10.2138/am.2008.2633	AM93_1215

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...