Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org

Important Update News

The RRUFF Project has been migrated to RRUFF.net. Please update your bookmarks immediately, if you have not done so.

The data on this website is already three years out of date, and the entire website will be taken offline before the end of the year.

We are grateful to NASA for the funding of this effort.




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:
Sandy Mountain, Llano Co., Texas, USA


mindat Locality ID: 250614
mindat URL: http://www.mindat.org/loc-250614.html

Tectonic Settings:

Total number of sublocalities beneath "Sandy Mountain, Llano Co., Texas, USA": 2
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Sandy Mountain Pegmatites

Latitude: 30°34'47"N
Longitude: 98°25'15"W
Decimal Degree (lat, lon): 30.579722222222,-98.420833333333
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 B Ca F Fe H K Mg Na O Si Sn Ti W Zr 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleAndalusiteClayCorundumFeldsparFluoriteMicaNoneNot in a structural groupPyroxene
QuartzRutileScheeliteTalcTopazTourmalineVesuvianiteWollastoniteZircon

18 IMA Minerals at location:
Andalusite  (*)Cassiterite  (*)Corundum  (*)Diopside  (*)Fluorite  (*)
Microcline  (*)Muscovite  (*)Quartz  (*)Rutile  (*)Scheelite  (*)
Schorl  (*)Sillimanite  (*)Talc  (*)Topaz  (*)Tremolite  (*)
Vesuvianite  (*)Wollastonite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Andalusite  (*)AndalusiteAl2SiO512707031310
Cassiterite  (*)RutileSnO212707035171
Corundum  (*)CorundumAl2O312707031797
Diopside  (*)PyroxeneCaMgSi2O612707034135
Fluorite  (*)FluoriteCaF212707039617
Microcline  (*)FeldsparK(AlSi3O8)12707034924
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2127070317380
Quartz  (*)QuartzSiO2127070361156
Rutile  (*)RutileTiO212707035614
Scheelite  (*)ScheeliteCa(WO4)12707034894
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)12707032705
Sillimanite  (*)Not in a structural groupAl2SiO512707031516
Talc  (*)Clay TalcMg3Si4O10(OH)212707033337
Topaz  (*)TopazAl2SiO4F212707031476
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)212707032562
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)1012707031395
Wollastonite  (*)WollastoniteCaSiO312707031247
Zircon  (*)ZirconZr(SiO4)12707035251


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

All locality data graciously provided by mindat.org

All age data...

Other copyright data...