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:
Gillespie Co., Texas, USA


mindat Locality ID: 32630
mindat URL: http://www.mindat.org/loc-32630.html

Tectonic Settings:

Total number of sublocalities beneath "Gillespie Co., Texas, USA": 12
Total number of bottom-level sublocalities: 10

Number of Child Localities: 10
Child Localities:
Althaus Pegmatite
Amethyst Hill
Big Branch Area
Coal Creek Serpentinite (Big Branch)
Davis Ranch
Fredericksburg
Fredricksburg Gypsum Company Mine (Cherry Mountain Mine)
Legion Creek Area
Moss Ranch
Northeast Corner

Latitude: 30°25'47"N
Longitude: 98°42'9"W
Decimal Degree (lat, lon): 30.429722222222,-98.7025
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 C Ca Cr F Fe H K Mg Na Ni O S Si W 

Elements from minerals reported directly at this locality: Al C Ca F Fe H Mg Na O Si 

Structural Groups for minerals in this locality: 
AmorphousAmphiboleBaryteCalciteClayClinozoisiteEpidoteFeldsparGarnetGypsum
NoneQuartzScheeliteSerpentineSmectite-vermiculiteSpinelStauroliteTalcVesuvianite

21 IMA Minerals at location:
Actinolite  (*)Almandine  (*)Anthophyllite  (*)Baryte  (*)Calcite  (*)
Chromite  (*)Chrysotile  (*)Epidote  (*)Graphite  (*)Gypsum  (*)
Lizardite  (*)Magnetite  (*)Microcline  (*)Quartz  (*)Scheelite  (*)
Staurolite  (*)Talc  (*)Tremolite  (*)Vermiculite  (*)Vesuvianite  (*)
Zaratite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)212702033419
Almandine  (*)GarnetFe2+3Al2(SiO4)302353
Anthophyllite  (*)Amphibole   Mg2Mg5Si8O22(OH)22270203,270209718
Baryte  (*)BaryteBa(SO4)127020411547
Calcite  (*)CalciteCa(CO3)127020227770
Chromite  (*)SpinelFe2+Cr2O412702033902
Chrysotile  (*)Serpentine ClayMg3Si2O5(OH)41270203951
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)2270204,2702108173
Graphite  (*)NoneC02812
Gypsum  (*)GypsumCa(SO4)·2H2O12702086890
Lizardite  (*)Serpentine ClayMg3Si2O5(OH)41270203359
Magnetite  (*)SpinelFe2+Fe3+2O44270202,270203,270204,27020914899
Microcline  (*)FeldsparK(AlSi3O8)2270200,2702114924
Quartz  (*)QuartzSiO25270200,270201,270203,270204,27021161156
Scheelite  (*)ScheeliteCa(WO4)2270204,2702104894
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)1270211978
Talc  (*)Clay TalcMg3Si4O10(OH)24270201,270202,270203,2702093337
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)22270203,2702092562
Vermiculite  (*)Clay Smectite-vermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4·8H2O1270203652
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)1001395
Zaratite  (*)AmorphousNi3(CO3)(OH)4·4H2O127020356


No ages have been assigned to this locality yet.

All locality data graciously provided by mindat.org

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