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

AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe 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.

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: 
BerylClayFeldsparMicaNoneQuartzTopaz

5 IMA Minerals at location:
Beryl  (*)Microcline  (*)Muscovite  (*)Quartz  (*)Topaz  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Beryl  (*)BerylBe3Al2Si6O181490125004286
Microcline  (*)FeldsparK(AlSi3O8)1490125004924
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)214901250017380
Quartz  (*)QuartzSiO214901250061156
Topaz  (*)TopazAl2SiO4F21490125001476



2 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
Alexandra-0309145012501350 ± 100Rb–Sr, K-Ar, U-PbAge of pegmatitelepidolite, monazite, сolumbite, tantalite  Yes  5902Brown Derby Mine, Quartz Creek Pegmatite District, Gunnison Co., Colorado, USABrown DerbyAldrich et al. (1956)10.1029/JZ061i002p00215JGR61_215 
Bradley_2012_146149013501420±70Rb/Sr    Yes  5902Brown Derby Mine, Quartz Creek Pegmatite District, Gunnison Co., Colorado, USABrown DerbyMcCauley and Bradley (2014)10.3749/canmin.52.2.183CM52_183 


SampleSource LocalityReference URL


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