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:
Brown Derby No. 4 Mine, Brown Derby Mine, Quartz Creek Pegmatite District, Gunnison Co., Colorado, USA

Oldest recorded age at locality: 1490
Youngest recorded age at locality: 1250

mindat Locality ID: 69270
mindat URL: http://www.mindat.org/loc-69270.html

Tectonic Settings:

Total number of sublocalities beneath "Brown Derby No. 4 Mine, Brown Derby Mine, Quartz Creek Pegmatite District, Gunnison Co., Colorado, USA": 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.

Beryl	Clay	Feldspar	Mica	None	Quartz	Topaz

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 F H K O Si

Elements from minerals reported directly at this locality: Al Be F H K O Si

Structural Groups for minerals in this locality:
Beryl Clay Feldspar Mica None Quartz Topaz

5 IMA Minerals at location:

Beryl ()*	Microcline ()*	Muscovite ()*	Quartz ()*	Topaz ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	1490	1250	4286
Microcline ()*	Feldspar	K(AlSi₃O₈)	1490	1250	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	1490	1250	17380
Quartz ()*	Quartz	SiO₂	1490	1250	61156
Topaz ()*	Topaz	Al₂SiO₄F₂	1490	1250	1476

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
	Alexandra-0309	1450	1250	1350 ± 100	Rb–Sr, K-Ar, U-Pb	Age of pegmatite		lepidolite, monazite, сolumbite, tantalite			Yes				5902	Brown Derby Mine, Quartz Creek Pegmatite District, Gunnison Co., Colorado, USA	Brown Derby	Aldrich et al. (1956)	10.1029/JZ061i002p00215	JGR61_215
	Bradley_2012_146	1490	1350	1420±70	Rb/Sr						Yes				5902	Brown Derby Mine, Quartz Creek Pegmatite District, Gunnison Co., Colorado, USA	Brown Derby	McCauley and Bradley (2014)	10.3749/canmin.52.2.183	CM52_183

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...