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Cactus Jack pegmatite, Burnet Co., Texas, USAi
Regional Level Types
Cactus Jack pegmatitePegmatite
Burnet Co.County
TexasState
USACountry

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Key
Latitude & Longitude (WGS84):
30° North , 98° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~41km
Locality type:
Köppen climate type:


Named by Franklin Roberts, co-developer of this location, in honor of "Cactus" Jack Carson, also a co-developer. Jack was the owner-operator of Cactus Canyon Quarries, Inc and was something of a local Texas legend since the 1950's. He and his son Andy Carson were instrumental in helping Mr. Roberts with the initial excavation of the new pegmatite. Without their heavy equipment and experience, H'd still be out in a sweltering Texas cow pasture trying to dig a hole in solid rock with nothing but a pick and shovel. Cactus Jack passed away within a year of excavating the pegmatite.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


24 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Self-Collected by Franklin Roberts
Beryl
Formula: Be3Al2(Si6O18)
Habit: Hexagonal
Colour: green, blue-green
Fluorescence: none
Description: Tapered hexagonal crystal segments up to 12 cm between opposite faces. Some specimens found growing from milky quartz matrix. Deeper material may be of gem guality.
Reference: Self-collected by Franklin Roberts
Beryl var. Aquamarine
Formula: Be3Al2Si6O18
Habit: Hexagonal
Colour: green, blue-green
Fluorescence: none
Description: Tapered hexagonal crystal segments up to 12 cm between opposite faces. Some specimens found growing from milky quartz matrix. Deeper material may be of gem guality.
Reference: Self-collected by Franklin Roberts
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
Habit: Hexagonal books to 2 cm in thickness, 10 cm in girth.
Colour: Black, Golden (when weathered)
Fluorescence: None
Description: Occurs in the graphic granite zone of the pegmatite. Tiny cyrtolite zircons sometimes found between biotite laminae.
Reference: Self-Collected by Franklin Roberts
Euxenite-(Y)
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Reference: Self-Collected by Franklin Roberts
Fluorite
Formula: CaF2
Reference: Franklin Roberts
Fluorite var. Chlorophane
Formula: CaF2
Reference: Franklin Roberts
Galena
Formula: PbS
Habit: Massive, fracture-filling
Colour: Dark gray
Fluorescence: None
Description: Occurs as radiogenic galena in the interstitial spaces of radioactive rare-earth minerals from orange clay-filled crystal pockets in the pegmatite.
Reference: Self-Collected by Franklin Roberts
Ilmenite
Formula: Fe2+TiO3
Reference: Self-Collected by Franklin Roberts
Ixiolite
Formula: (Ta,Nb,Sn,Fe,Mn)4O8
Reference: Self-Collected by Franklin Roberts
Microcline
Formula: K(AlSi3O8)
Reference: Self-Collected by Franklin Roberts
'Microlite Group'
Formula: A2-mTa2X6-wZ-n
Reference: Self-Collected by Franklin Roberts
Monazite-(Ce)
Formula: Ce(PO4)
Habit: Tabular, Monoclinic, Masses to 2.4 kg
Colour: Brick-red, Brown, Tan
Fluorescence: None
Description: Exceptionally large, euhedral crystals with pronounced radioactivity. Polished section microprobe analysis indicates a high degree of homogeneity. Th content is 8-16 weight percent.
Reference: F Roberts, 2006
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: Tetragonal, tapering foliated columnar, curved faces
Colour: Metallic silver with black mottling
Fluorescence: None
Description: Occurs as tapered columns of curved tetragonal flakes to 3cm length, 1-2cm girth. This variety is also known as "ball-peen" mica due to its resemblance to decorative hammered metal.
Reference: F Roberts, 2006
Opal
Formula: SiO2 · nH2O
Reference: Self-Collected by Franklin Roberts
Opal var. Opal-AN
Formula: SiO2 · nH2O
Reference: Personally collected by Franklin Roberts
Polycrase-(Y)
Formula: Y(Ti,Nb)2(O,OH)6
Reference: Self-Collected by Franklin Roberts
Quartz
Formula: SiO2
Reference: F Roberts, 2006
Quartz var. Milky Quartz
Formula: SiO2
Description: Forms the central dike of the pegmatite. Large crystal pockets occur in this dike that are lined with euhedral water-clear quartz crystals and possibly beryl.
Reference: Self-Collected by Franklin Roberts : Roselle M. Girard (1964) Texas Rocks and Minerals : Bureau of Economic Geology Guidebook No.6
Quartz var. Smoky Quartz
Formula: SiO2
Reference: F Roberts, 2006
Rutile
Formula: TiO2
Reference: Self-Collected by Franklin Roberts
Samarskite-(Y)
Formula: YFe3+Nb2O8
Reference: Self-Collected by Franklin Roberts
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: Self-Collected by Franklin Roberts
Tanteuxenite-(Y)
Formula: Y(Ta,Nb,Ti)2(O,OH)6
Habit: metamict
Fluorescence: none
Description: Occurs in mixed-phase rare-earth mineral nodules from orange clay-filled pockets at quartz-microcline contacts.
Reference: Self-Collected by Franklin Roberts
Thorianite
Formula: ThO2
Reference: Self-Collected by Franklin Roberts
Thorite
Formula: Th(SiO4)
Reference: F Roberts, 2006
Uraninite
Formula: UO2
Reference: Self-Collected by Franklin Roberts
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Reference: Self-Collected by Franklin Roberts
Uranopolycrase
Formula: (U4+,Y)(Ti,Nb)2O6
Habit: metamict
Fluorescence: none
Description: Occurs in mixed-phase rare-earth mineral nodules from orange clay-filled pockets at quartz-microcline contacts.
Reference: Self-Collected by Franklin Roberts
'Wad'
Habit: Earthy
Colour: brown, black, bluish-black
Fluorescence: none
Description: Normally found as thick weathered alteration coatings on euhedral spessartine garnets in the graphic granite zone of the pegmatite.
Reference: Self-collected by Franklin Roberts, confirmed by wet chemical tests
Xenotime-(Yb)
Formula: Yb(PO4)
Habit: Massive, Tetragonal Bipyramidal
Colour: gray, black
Fluorescence: None
Description: Found as radioactive 1-3 cm nodules and 3-10 mm crystals at quartz-blocky microcline contacts and in orange clay-filled pockets near these zones.
Reference: Self-collected by Franklin Roberts
Zircon
Formula: Zr(SiO4)
Reference: Self-Collected by Franklin Roberts

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Group 3 - Halides
Fluorite3.AB.25CaF2
var. Chlorophane3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Euxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ilmenite4.CB.05Fe2+TiO3
Ixiolite4.DB.25(Ta,Nb,Sn,Fe,Mn)4O8
'Microlite Group'4.00.A2-mTa2X6-wZ-n
Opal4.DA.10SiO2 · nH2O
var. Opal-AN4.DA.10SiO2 · nH2O
Polycrase-(Y)4.DG.05Y(Ti,Nb)2(O,OH)6
Quartz4.DA.05SiO2
var. Milky Quartz4.DA.05SiO2
var. Smoky Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Samarskite-(Y)4.DB.25YFe3+Nb2O8
Tanteuxenite-(Y)4.DG.05Y(Ta,Nb,Ti)2(O,OH)6
Thorianite4.DL.05ThO2
Uraninite4.DL.05UO2
Uranopolycrase4.DG.05(U4+,Y)(Ti,Nb)2O6
Group 8 - Phosphates, Arsenates and Vanadates
Monazite-(Ce)8.AD.50Ce(PO4)
Xenotime-(Yb)8.AD.35Yb(PO4)
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Beryl9.CJ.05Be3Al2(Si6O18)
var. Aquamarine9.CJ.05Be3Al2Si6O18
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Thorite9.AD.30Th(SiO4)
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
'Wad'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Rutile4.4.1.1TiO2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Thorianite5.1.1.2ThO2
Uraninite5.1.1.1UO2
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Ixiolite8.1.10.1(Ta,Nb,Sn,Fe,Mn)4O8
Samarskite-(Y)8.1.11.1YFe3+Nb2O8
A2B2O6(O,OH,F)
'Microlite Group'8.2.2.1A2-mTa2X6-wZ-n
AB2O6
Euxenite-(Y)8.3.8.2(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Polycrase-(Y)8.3.8.1Y(Ti,Nb)2(O,OH)6
Tanteuxenite-(Y)8.3.8.3Y(Ta,Nb,Ti)2(O,OH)6
Uranopolycrase8.3.8.5(U4+,Y)(Ti,Nb)2O6
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
Monazite-(Ce)38.4.3.1Ce(PO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Zircon51.5.2.1Zr(SiO4)
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Uranophane53.3.1.2Ca(UO2)2(SiO3OH)2 · 5H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Beryl
var. Aquamarine
-Be3Al2Si6O18
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
Fluorite
var. Chlorophane
-CaF2
Opal
var. Opal-AN
-SiO2 · nH2O
Quartz
var. Milky Quartz
-SiO2
var. Smoky Quartz-SiO2
'Wad'-
Xenotime-(Yb)-Yb(PO4)

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
H Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
H Uranopolycrase(U4+,Y)(Ti,Nb)2O6
H Polycrase-(Y)Y(Ti,Nb)2(O,OH)6
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H OpalSiO2 · nH2O
H Opal var. Opal-ANSiO2 · nH2O
BeBeryllium
Be Beryl var. AquamarineBe3Al2Si6O18
Be BerylBe3Al2(Si6O18)
OOxygen
O Monazite-(Ce)Ce(PO4)
O MuscoviteKAl2(AlSi3O10)(OH)2
O Xenotime-(Yb)Yb(PO4)
O Beryl var. AquamarineBe3Al2Si6O18
O BerylBe3Al2(Si6O18)
O Quartz var. Smoky QuartzSiO2
O ThoriteTh(SiO4)
O SpessartineMn32+Al2(SiO4)3
O Quartz var. Milky QuartzSiO2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
O MicroclineK(AlSi3O8)
O Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
O Samarskite-(Y)YFe3+Nb2O8
O Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
O Uranopolycrase(U4+,Y)(Ti,Nb)2O6
O ZirconZr(SiO4)
O IlmeniteFe2+TiO3
O Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
O RutileTiO2
O ThorianiteThO2
O Polycrase-(Y)Y(Ti,Nb)2(O,OH)6
O AlbiteNa(AlSi3O8)
O UraniniteUO2
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O OpalSiO2 · nH2O
O Opal var. Opal-ANSiO2 · nH2O
O QuartzSiO2
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
F Fluorite var. ChlorophaneCaF2
F FluoriteCaF2
NaSodium
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Beryl var. AquamarineBe3Al2Si6O18
Al BerylBe3Al2(Si6O18)
Al SpessartineMn32+Al2(SiO4)3
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
SiSilicon
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Beryl var. AquamarineBe3Al2Si6O18
Si BerylBe3Al2(Si6O18)
Si Quartz var. Smoky QuartzSiO2
Si ThoriteTh(SiO4)
Si SpessartineMn32+Al2(SiO4)3
Si Quartz var. Milky QuartzSiO2
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
Si MicroclineK(AlSi3O8)
Si ZirconZr(SiO4)
Si AlbiteNa(AlSi3O8)
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si OpalSiO2 · nH2O
Si Opal var. Opal-ANSiO2 · nH2O
Si QuartzSiO2
PPhosphorus
P Monazite-(Ce)Ce(PO4)
P Xenotime-(Yb)Yb(PO4)
SSulfur
S GalenaPbS
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
K MicroclineK(AlSi3O8)
CaCalcium
Ca Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Ca Fluorite var. ChlorophaneCaF2
Ca FluoriteCaF2
TiTitanium
Ti BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
Ti Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ti Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Ti Uranopolycrase(U4+,Y)(Ti,Nb)2O6
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
Ti Polycrase-(Y)Y(Ti,Nb)2(O,OH)6
MnManganese
Mn SpessartineMn32+Al2(SiO4)3
Mn Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
FeIron
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3[AlSi3O10(OH)2
Fe Samarskite-(Y)YFe3+Nb2O8
Fe IlmeniteFe2+TiO3
YYttrium
Y Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Y Samarskite-(Y)YFe3+Nb2O8
Y Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Y Uranopolycrase(U4+,Y)(Ti,Nb)2O6
Y Polycrase-(Y)Y(Ti,Nb)2(O,OH)6
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nb Samarskite-(Y)YFe3+Nb2O8
Nb Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Nb Uranopolycrase(U4+,Y)(Ti,Nb)2O6
Nb Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
Nb Polycrase-(Y)Y(Ti,Nb)2(O,OH)6
CeCerium
Ce Monazite-(Ce)Ce(PO4)
Ce Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
YbYtterbium
Yb Xenotime-(Yb)Yb(PO4)
TaTantalum
Ta Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ta Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Ta Microlite GroupA2-mTa2X6-wZ-n
Ta Uranopolycrase(U4+,Y)(Ti,Nb)2O6
Ta Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
PbLead
Pb GalenaPbS
ThThorium
Th ThoriteTh(SiO4)
Th Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Th ThorianiteThO2
UUranium
U Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
U Uranopolycrase(U4+,Y)(Ti,Nb)2O6
U UraniniteUO2
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Franklin Roberts postings.

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