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:
Riley Mts, Llano Co., Texas, USA


mindat Locality ID: 250611
mindat URL: http://www.mindat.org/loc-250611.html

Tectonic Settings:

Total number of sublocalities beneath "Riley Mts, Llano Co., Texas, USA": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Boyd Mine (Almagres Mine)

Latitude: 30°36'41"N
Longitude: 98°36'15"W
Decimal Degree (lat, lon): 30.611388888889,-98.604166666667
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 As B Ca Fe H K Mg Mn Na O Pb S Si 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleArsenopyriteBrauniteClayClinozoisiteEpidoteMicaNonePyriteRocksalt
SpinelTourmaline

9 IMA Minerals at location:
Actinolite  (*)Arsenopyrite  (*)Braunite  (*)Epidote  (*)Galena  (*)
Magnetite  (*)Muscovite  (*)Pyrite  (*)Schorl  (*)
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)212706993419
Arsenopyrite  (*)ArsenopyriteFeAsS12706999052
Braunite  (*)BrauniteMn2+Mn3+6O8(SiO4)1270699483
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)12706998173
Galena  (*)RocksaltPbS127069924243
Magnetite  (*)SpinelFe2+Fe3+2O4127069914899
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2127069917380
Pyrite  (*)PyriteFeS2127069939462
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)12706992705


No ages have been assigned to this locality yet.
SampleSource LocalityReference URL

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