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:
Groote Eylandt, East Arnhem Region, Northern Territory, Australia

Oldest recorded age at locality: 30
Youngest recorded age at locality: 16

mindat Locality ID: 257697
mindat URL: http://www.mindat.org/loc-257697.html

Tectonic Settings:

Total number of sublocalities beneath "Groote Eylandt, East Arnhem Region, Northern Territory, Australia": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
GEMCO Mine

Latitude: 14°'"S
Longitude: 136°30'0"E
Decimal Degree (lat, lon): -14,136.5

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 Ba Ca Fe H K Li Mg Mn Na O Si Sr Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
BrauniteClayCoronaditeKaoliniteNoneQuartzRamsdelliteRutile

13 IMA Minerals at location:
Birnessite  (*)Braunite  (*)Chalcophanite  (*)Cryptomelane  (*)Kaolinite  (*)
Lithiophorite  (*)Manganite  (*)Nsutite  (*)Pyrolusite  (*)Quartz  (*)
Romanèchite  (*)Todorokite  (*)Vernadite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Birnessite  (*)None(Na,Ca,K)0.6(Mn4+,Mn3+)2O4·1.5H2O3016110901178
Braunite  (*)BrauniteMn2+Mn3+6O8(SiO4)3016110901483
Chalcophanite  (*)NoneZnMn4+3O7·3H2O3016110901197
Cryptomelane  (*)CoronaditeK(Mn4+7Mn3+)O161816110901599
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)430161109015591
Lithiophorite  (*)None(Al,Li)(Mn4+,Mn3+)O2(OH)23016110901210
Manganite  (*)RutileMn3+O(OH)3016110901770
Nsutite  (*)RamsdelliteMn2+xMn4+1-xO2-2x(OH)2x3016110901121
Pyrolusite  (*)RutileMnO230161109013106
Quartz  (*)QuartzSiO2301611090161156
Romanèchite  (*)None(Ba,H2O)2(Mn4+,Mn3+)5O103030110901312
Todorokite  (*)None(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O3016110901433
Vernadite  (*)None(Mn,Fe,Ca,Na)(O,OH)2·nH2O301611090165



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
Scott-EG91_386-0001181618-16K-Arage of mineralizationwhole rock   CryptomelaneK, Mn, Ba125742GEMCO Mine, Groote Eylandt, East Arnhem Region, Northern Territory, AustraliaGEMCO MineDammer et al. (1996)10.2113/gsecongeo.91.2.386EG91_386age of precipitation, as a result of chemical weathering through widespread dissolution and in situ replacement of pisoliths and ooliths
Scott-EG91_386-0002303030K-Arage of mineralizationwhole rock   RomanechiteMn, Ba125742GEMCO Mine, Groote Eylandt, East Arnhem Region, Northern Territory, AustraliaGEMCO MineDammer et al. (1996)10.2113/gsecongeo.91.2.386EG91_386 


SampleSource LocalityReference URL


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