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:
Llano Co., Texas, USA

Oldest recorded age at locality: 1121.37
Youngest recorded age at locality: 964.22

mindat Locality ID: 9986
mindat URL: http://www.mindat.org/loc-9986.html

Tectonic Settings:

Total number of sublocalities beneath "Llano Co., Texas, USA": 65
Total number of bottom-level sublocalities: 56

Number of Child Localities: 54
Child Localities:
Babyhead Mountain Area
Bader Iron Deposit
Blount Mountain (Stewart Property)
Bluffton
Buchanan Lake
Calcite Prospect
Dixie Graphite Mine
Enchanted Rock State Park (Charles Moss Ranch)
Freeman And Hiilsmeier Properties
Garrett Property
Graphilter Corp. Pit And Plant
Graphite Mine
Gray Fowler Area
Green Mountain Quarry
Heath Gold Mine (Llano Gold & Rare Metal Mining Company; Dixie Graphite Company)
Honey Creek
Horse Mountain
Iron Mountain
Keener Branch Area
Kiam Pegmatite
Kingsland Area
Kingsland Granite Company Quarry (Petrick Quarry)
Kothman Tract
Liano Pyrite Site
Liano Region
Llanite Rhyolite Site
Llano
Mayes Pasture
Meramac Minerals Mine
Miller Mountain
Molybdenum Prospect
Moss Ranch
Olive Mine
Oxford
Oxford Area
Packsaddle Mountain Area
Parkinson Ranch
Pebble Beach Pegmatites
Riley Mts
Rode Ranch Pegmatite
Sandy Mountain
Schneider Prospect
Sheetons Place
Six Mile Quarry
Snead Quarry
Talc Occurrence
Texas Arch Aggregates Serpentine Quarry
Texas Graphite Mine
Texas Mines
Town Mountain Area
Unnamed Quarry
Vermiculite Occurrence
Williams Pegmatites (Williams Gardens)
Yearlinghead Mountain South (Carl Ranch)

Latitude: 30°42'14"N
Longitude: 98°38'39"W
Decimal Degree (lat, lon): 30.703888888889,-98.644166666667

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Acanthite	Allanite	Alunite	Amorphous	Amphibole	Andalusite	Apatite	Arsenic	Arsenopyrite	Autunite
Baryte	Beryl	Braunite	Calcite	Chalcanthite	Chalcopyrite	Clay	Clinozoisite	Cobaltite	Columbite
Copiapite	Copper	Corundum	Cristobalite	Diaspore	Epidote	Feldspar	Fluorite	Gadolinite	Garnet
Gypsum	Kaolinite	Malachite	Marcasite	Melanterite	Mica	Molybdenite	Nickeline	None	Not in a structural group
Olivine	Prehnite	Pyrite	Pyroxene	Quartz	Rocksalt	Rowlandite	Rutile	Scheelite	Smectite-vermiculite
Sphalerite	Spinel	Stibnite	Talc	Tetradymite	Tetrahedrite	Titanite	Topaz	Tourmaline	Vesuvianite
Wollastonite	Zircon

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: Ag Al As Au B Ba Be Bi C Ca Ce Co Cr Cu F Fe H K Mg Mn Mo Na Nb Ni O P Pb REE S Sb Si Sn Te Th Ti U W Y Zn Zr

Elements from minerals reported directly at this locality: C H Ni O

Structural Groups for minerals in this locality:
Acanthite Allanite Alunite Amorphous Amphibole Andalusite Apatite Arsenic Arsenopyrite Autunite
Baryte Beryl Braunite Calcite Chalcanthite Chalcopyrite Clay Clinozoisite Cobaltite Columbite
Copiapite Copper Corundum Cristobalite Diaspore Epidote Feldspar Fluorite Gadolinite Garnet
Gypsum Kaolinite Malachite Marcasite Melanterite Mica Molybdenite Nickeline None Not in a structural group
Olivine Prehnite Pyrite Pyroxene Quartz Rocksalt Rowlandite Rutile Scheelite Smectite-vermiculite
Sphalerite Spinel Stibnite Talc Tetradymite Tetrahedrite Titanite Topaz Tourmaline Vesuvianite
Wollastonite Zircon

103 IMA Minerals at location:

Acanthite ()*	Actinolite ()*	Albite ()*	Allanite-(Ce) ()*	Almandine ()*
Anatase ()*	Andalusite ()*	Andradite ()*	Anthophyllite ()*	Arsenopyrite ()*
Autunite ()*	Azurite ()*	Baryte ()*	Behoite ()*	Beryl ()*
Bismuth ()*	Bismuthinite ()*	Bornite ()*	Braunite ()*	Britholite-(Y) ()*
Calcite ()*	Cassiterite ()*	Chalcanthite ()*	Chalcocite ()*	Chalcopyrite ()*
Chromite ()*	Churchite-(Y) ()*	Cobaltite ()*	Copiapite ()*	Copper ()*
Cordierite ()*	Corundum ()*	Diopside ()*	Epidote ()*	Fergusonite-(Y) ()*
Ferrimolybdite ()*	Fluorapatite ()*	Fluorite ()*	Gadolinite-(Y) ()*	Galena ()*
Goethite ()*	Gold ()*	Graphite ()*	Grossular ()*	Hausmannite ()*
Hematite ()*	Ilmenite ()*	Jarosite ()*	Kaolinite ()*	Magnesite ()*
Magnetite ()*	Malachite ()*	Marcasite ()*	Melanterite ()*	Microcline ()*
Molybdenite ()*	Molybdite ()*	Montmorillonite ()*	Muscovite ()*	Nontronite ()*
Opal ()*	Orthoclase ()*	Phlogopite ()*	Piemontite ()*	Polycrase-(Y) ()*
Powellite ()*	Prehnite ()*	Pyrite ()*	Pyrrhotite ()*	Quartz ()*
Rowlandite-(Y) ()*	Rutile ()*	Samarskite-(Y) ()*	Sanidine ()*	Scheelite ()*
Schorl ()*	Siderite ()*	Sillimanite ()*	Silver ()*	Spessartine ()*
Sphalerite ()*	Synchysite-(Y) ()*	Talc ()*	Tephroite ()*	Tetradymite ()*
Tetrahedrite-(Zn) ()*	Thalénite-(Y) ()*	Thorite ()*	Titanite ()*	Topaz ()*
Torbernite ()*	Tremolite ()*	Tveitite-(Y) ()*	Uraninite ()*	Uranophane-α ()*
Vermiculite ()*	Vesuvianite ()*	Wollastonite ()*	Yttrialite-(Y) ()*	Yttrocrasite-(Y) ()*
Zaratite ()*	Zircon ()*	Zoisite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Acanthite ()*	Acanthite	Ag₂S			1	270685	2793
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂			1	270699	3419
Albite ()*	Feldspar	Na(AlSi₃O₈)			6	270659,270676,270679,270685,270697,270700	8803
Allanite-(Ce) ()*	Allanite Epidote	CaCe(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH)			2	270659,270700	706
Almandine ()*	Garnet	Fe²⁺₃Al₂(SiO₄)₃			3	270653,270654,270655	2353
Anatase ()*	Not in a structural group	TiO₂			1	270685	2162
Andalusite ()*	Andalusite	Al₂SiO₅			2	270695,270703	1310
Andradite ()*	Garnet	Ca₃Fe³⁺₂(SiO₄)₃			4	270653,270654,270655,270680	1534
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂			3	270675,270693,270694	718
Arsenopyrite ()*	Arsenopyrite	FeAsS			3	270679,270685,270699	9052
Autunite ()*	Autunite	Ca(UO₂)₂(PO₄)₂·10-12H₂O			1	270659	1272
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	1121.37	964.22	4	270653,270654,270655,270686	5509
Baryte ()*	Baryte	Ba(SO₄)			2	270656,270664	11547
Behoite ()*	Cristobalite	Be(OH)₂			2	270679,270700	24
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈			1	270676	4286
Bismuth ()*	Arsenic	Bi			1	270676	1966
Bismuthinite ()*	Stibnite	Bi₂S₃			1	270676	1935
Bornite ()*	None	Cu₅FeS₄			1	270685	5516
Braunite ()*	Braunite	Mn²⁺Mn³⁺₆O₈(SiO₄)			2	270673,270699	483
Britholite-(Y) ()*	Apatite	(Y,Ca)₅(SiO₄)₃(OH)			1	270679	28
Calcite ()*	Calcite	Ca(CO₃)			8	270657,270661,270676,270679,270695,270700,270704,270711	27770
Cassiterite ()*	Rutile	SnO₂			3	270654,270695,270703	5171
Chalcanthite ()*	Chalcanthite	Cu(SO₄)·5H₂O			1	270685	925
Chalcocite ()*	None	Cu₂S			5	270653,270654,270655,270685,270704	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			7	270653,270654,270655,270659,270679,270685,270704	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄			1	270693	3902
Churchite-(Y) ()*	Gypsum	Y(PO₄)·2H₂O			1	270685	70
Cobaltite ()*	Cobaltite	CoAsS			1	270685	966
Copiapite ()*	Copiapite	Fe²⁺Fe³⁺₄(SO₄)₆(OH)₂·20H₂O			1	270659	382
Copper ()*	Copper	Cu			1	270685	3846
Cordierite ()*	Beryl	Mg₂Al₄Si₅O₁₈			1	270695	1008
Corundum ()*	Corundum	Al₂O₃			1	270703	1797
Diopside ()*	Pyroxene	CaMgSi₂O₆			3	270657,270685,270703	4135
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	1082	1014	8	270653,270654,270655,270663,270682,270696,270699,270704	8173
Fergusonite-(Y) ()*	Scheelite	YNbO₄			2	270659,270679	196
Ferrimolybdite ()*	None	Fe³⁺₂(Mo⁶⁺O₄)₃·7H₂O			1	270659	345
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F			2	270679,270695	2740
Fluorite ()*	Fluorite	CaF₂			6	270659,270679,270685,270700,270703,270715	9617
Gadolinite-(Y) ()*	Gadolinite	Y₂Fe²⁺Be₂O₂(SiO₄)₂			1	270659	163
Galena ()*	Rocksalt	PbS			3	270654,270685,270699	24243
Goethite ()*	Diaspore	FeO(OH)			3	270665,270685,270697	7437
Gold ()*	Copper	Au			4	270654,270670,270676,270685	30554
Graphite ()*	None	C			8	270662,270666,270667,270670,270679,270695,270710,270711	2812
Grossular ()*	Garnet	Ca₃Al₂(SiO₄)₃			2	270657,270685	1544
Hausmannite ()*	Spinel	Mn²⁺Mn³⁺₂O₄			1	270673	350
Hematite ()*	Corundum	Fe₂O₃			10	270653,270654,270655,270659,270674,270679,270685,270695,270697,270700	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			1	270659	5433
Jarosite ()*	Alunite	KFe³⁺₃(SO₄)₂(OH)₆			2	270679,270685	2228
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄			1	270685	5591
Magnesite ()*	Calcite	Mg(CO₃)			6	270668,270669,270672,270687,270707,270711	1487
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			17	270653,270654,270655,270656,270659,270673,270674,270675,270679,270688,270691,270693,270694,270697,270699,270700,270716	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	1121.37	964.22	5	270653,270654,270655,270670,270686	12537
Marcasite ()*	Marcasite	FeS₂			1	270679	5674
Melanterite ()*	Melanterite	Fe(SO₄)·7H₂O			1	270685	915
Microcline ()*	Feldspar	K(AlSi₃O₈)	1082	1014	11	270659,270660,270663,270676,270679,270685,270695,270697,270700,270703,270715	4924
Molybdenite ()*	Molybdenite	MoS₂			5	270659,270670,270676,270679,270689	5800
Molybdite ()*	None	MoO₃			1	270659	140
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O			1	270700	1508
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			7	270659,270676,270679,270685,270699,270700,270703	17380
Nontronite ()*	Clay Smectite-vermiculite	Na_0.3Fe³⁺₂(Si,Al)₄O₁₀(OH)₂·nH₂O			1	270700	471
Opal ()*	Amorphous	SiO₂·nH₂O			5	270657,270659,270679,270700,270706	2994
Orthoclase ()*	Feldspar	K(AlSi₃O₈)			2	270659,270680	2349
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂			2	270659,270711	2273
Piemontite ()*	Epidote	Ca₂(Al₂Mn³⁺)[Si₂O₇][SiO₄]O(OH)			1	270673	260
Polycrase-(Y) ()*	Columbite	Y(Ti,Nb)₂(O,OH)₆			1	270659	121
Powellite ()*	Scheelite	Ca(MoO₄)			3	270659,270670,270679	494
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂			1	270657	1898
Pyrite ()*	Pyrite	FeS₂			11	270659,270670,270679,270681,270685,270691,270695,270699,270700,270705,270711	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈			2	270691,270711	9056
Quartz ()*	Quartz	SiO₂	1082	1014	21	270659,270660,270663,270670,270673,270676,270677,270679,270680,270683,270685,270693,270694,270695,270696,270697,270700,270703,270704,270712,270715	61156
Rowlandite-(Y) ()*	Rowlandite	Fe²⁺Y₄(Si₂O₇)₂F₂			1	270659	8
Rutile ()*	Rutile	TiO₂			5	270659,270679,270685,270697,270703	5614
Samarskite-(Y) ()*	Columbite	YFe³⁺Nb₂O₈			2	270676,270679	353
Sanidine ()*	Feldspar	K(AlSi₃O₈)			1	270679	598
Scheelite ()*	Scheelite	Ca(WO₄)	1082	1014	6	270663,270682,270685,270695,270696,270703	4894
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)			6	270670,270695,270697,270699,270703,270712	2705
Siderite ()*	Calcite	Fe(CO₃)			1	270665	6417
Sillimanite ()*	Not in a structural group	Al₂SiO₅			2	270671,270703	1516
Silver ()*	Copper	Ag			1	270685	5186
Spessartine ()*	Garnet	Mn²⁺₃Al₂(SiO₄)₃			1	270673	1214
Sphalerite ()*	Sphalerite	ZnS			1	270659	21482
Synchysite-(Y) ()*	None	CaY(CO₃)₂F			1	270685	55
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂			8	270654,270675,270677,270693,270694,270703,270708,270716	3337
Tephroite ()*	Olivine	Mn²⁺₂(SiO₄)			1	270680	240
Tetradymite ()*	Tetradymite	Bi₂Te₂S			1	270676	510
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃			4	270653,270654,270655,270695	5317
Thalénite-(Y) ()*	None	Y₃Si₃O₁₀F			1	270700	26
Thorite ()*	Zircon	Th(SiO₄)			1	270659	1006
Titanite ()*	Titanite	CaTi(SiO₄)O			2	270676,270685	4899
Topaz ()*	Topaz	Al₂SiO₄F₂			1	270703	1476
Torbernite ()*	None	Cu(UO₂)₂(PO₄)₂·12H₂O			1	270685	1059
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂			7	270675,270677,270694,270695,270703,270711,270716	2562
Tveitite-(Y) ()*	None	(Y,Na)₆(Ca,Na,REE)₁₂(Ca,Na)F₄₂			1	270659	8
Uraninite ()*	Fluorite	UO₂			4	270659,270679,270685,270700	2718
Uranophane-α ()*	None	Ca(UO₂)₂(SiO₃OH)₂·5H₂O			1	270685	890
Vermiculite ()*	Clay Smectite-vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄·8H₂O			2	270714,270716	652
Vesuvianite ()*	Vesuvianite	(Ca,Na)₁₉(Al,Mg,Fe)₁₃(SiO₄)₁₀(Si₂O₇)₄(OH,F,O)₁₀			8	270653,270654,270655,270657,270659,270685,270690,270703	1395
Wollastonite ()*	Wollastonite	CaSiO₃			3	270657,270685,270703	1247
Yttrialite-(Y) ()*	None	Y₂Si₂O₇			2	270659,270700	25
Yttrocrasite-(Y) ()*	Columbite	(Y,Th,Ca,U)(Ti,Fe)₂(O,OH)₆			1	270659	8
Zaratite ()*	Amorphous	Ni₃(CO₃)(OH)₄·4H₂O	1121.37	964.22	0		56
Zircon ()*	Zircon	Zr(SiO₄)			5	270659,270679,270685,270700,270703	5251
Zoisite ()*	Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)			3	270653,270654,270655	1025

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Jen_0000001	Postkinematic plutons forcibly intruded by metamorphic lithologies

7 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Dated Mineral	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
Jen_0000001	1082	1014	1048±34	Rb-Sr	Postkinematic pluton intrusion	whole rock		Nb>Ta, Y, REE, Zr, U, Th, Be	42305	Enchanted Rock State Park (Charles Moss Ranch), Llano Co., Texas, USA	Enchanted Rock Batholith	Černý (1991)	10.1016/0301-9268(91)90111-M	PR51_429	Postkinematic plutons forcibly intruded by metamorphic lithologies
Jen_0000149	1048.003	1047.997	1048±0.003	Rb-Sr					42305	Enchanted Rock State Park (Charles Moss Ranch), Llano Co., Texas, USA	Enchanted Rock Batholith, Texas	Anderson (1983)	10.1130/MEM161-p133	GSAM161_133	anorogenic
USGS-Rb-Sr-04860	1121.37	1071.37	1096.37±25	Rb-Sr	age of metamorphic crystallization	whole rock			274396	Mayes Pasture, Llano Co., Texas, USA		USGS-Rb-Sr		USGS-Rb-Sr
USGS-Rb-Sr-04861	964.22	964.22	964.22	Rb-Sr	age of later metamorphism	muscovite	Muscovite		274396	Mayes Pasture, Llano Co., Texas, USA		USGS-Rb-Sr		USGS-Rb-Sr
USGS-Rb-Sr-04862	1019.67	1019.67	1019.67	Rb-Sr	age of later metamorphism	microcline	Microcline		274396	Mayes Pasture, Llano Co., Texas, USA		USGS-Rb-Sr		USGS-Rb-Sr
USGS-Rb-Sr-04863	1019.67	1019.67	1019.67	Rb-Sr	age of later metamorphism	plagioclase			274396	Mayes Pasture, Llano Co., Texas, USA		USGS-Rb-Sr		USGS-Rb-Sr
USGS-Rb-Sr-04864	1019.67	1019.67	1019.67	Rb-Sr	age of later metamorphism	whole rock			274396	Mayes Pasture, Llano Co., Texas, USA		USGS-Rb-Sr		USGS-Rb-Sr

Sample	Source Locality	Reference URL
R130230	Rode Ranch Pegmatite, Llano Co., Texas, USA	https://rruff.info/R130230

All locality data graciously provided by mindat.org

All age data...