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Twin Knobs No. 1 Mine, Murfreesboro, Pike County, Arkansas, USAi
Regional Level Types
Twin Knobs No. 1 MineMine
Murfreesboro- not defined -
Pike CountyCounty
ArkansasState
USACountry

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Latitude & Longitude (WGS84):
34° 0' 0'' North , 93° 41' 59'' West
Latitude & Longitude (decimal):
34.00000,-93.70000
GeoHash:
G#: 9yj37v98r
GRN:
N23W56
Type:
Mine
KΓΆppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Murfreesboro1,580 (2017)7.0km
Nashville4,479 (2017)14.8km
Blevins308 (2017)18.2km
Delight268 (2017)18.5km
Mineral Springs1,161 (2017)24.1km
Mindat Locality ID:
25536
Long-form identifier:
mindat:1:2:25536:6
GUID (UUID V4):
8d1ff11d-77a1-4389-a229-8fe043f59fe8


A diamond property consisting of 13 acres.

Located 2 miles SW of the Crater of Diamonds.

Mineralization is in a lamproite diatreme.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


18 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:

β“˜ Almandine
Formula: Fe2+3Al2(SiO4)3
β“˜ Baryte
Formula: BaSO4
β“˜ Calcite
Formula: CaCO3
β“˜ Chromite
Formula: Fe2+Cr3+2O4
β“˜ 'Clinopyroxene Subgroup'
β“˜ Diamond
Formula: C
β“˜ Diopside
Formula: CaMgSi2O6
β“˜ Enstatite
Formula: Mg2Si2O6
β“˜ 'Fayalite-Forsterite Series'
β“˜ 'Feldspar Group'
β“˜ 'Garnet Group'
Formula: X3Z2(SiO4)3
β“˜ Ilmenite
Formula: Fe2+TiO3
β“˜ Ilmenite var. Picroilmenite
Formula: (Fe2+,Mg)TiO3
β“˜ 'Leucoxene'
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Muscovite var. Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
β“˜ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ 'Olivine Group'
Formula: M2SiO4
β“˜ 'Orthopyroxene Subgroup'
β“˜ Perovskite
Formula: CaTiO3
β“˜ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
β“˜ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
β“˜ 'Potassium richterite'
β“˜ Priderite
Formula: K(Ti4+7Fe3+)O16
β“˜ Pyrope
Formula: Mg3Al2(SiO4)3
β“˜ Pyrope var. Chromium-bearing Pyrope
Formula: Mg3(Al,Cr)2(SiO4)3
β“˜ 'Pyroxene Group'
Formula: ADSi2O6
β“˜ Quartz
Formula: SiO2
β“˜ Rutile
Formula: TiO2
β“˜ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
β“˜ Spinel
Formula: MgAl2O4
β“˜ Talc
Formula: Mg3Si4O10(OH)2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Diamond1.CB.10aC
Group 4 - Oxides and Hydroxides
β“˜Chromite4.BB.05Fe2+Cr3+2O4
β“˜Spinel4.BB.05MgAl2O4
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Ilmenite
var. Picroilmenite		4.CB.05(Fe2+,Mg)TiO3
β“˜4.CB.05Fe2+TiO3
β“˜Perovskite4.CC.30CaTiO3
β“˜Quartz4.DA.05SiO2
β“˜Rutile4.DB.05TiO2
β“˜Priderite4.DK.05bK(Ti4+7Fe3+)O16
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Baryte7.AD.35BaSO4
Group 9 - Silicates
β“˜Pyrope
var. Chromium-bearing Pyrope		9.AD.25Mg3(Al,Cr)2(SiO4)3
β“˜9.AD.25Mg3Al2(SiO4)3
β“˜Almandine9.AD.25Fe2+3Al2(SiO4)3
β“˜Enstatite9.DA.05Mg2Si2O6
β“˜Diopside9.DA.15CaMgSi2O6
β“˜Talc9.EC.05Mg3Si4O10(OH)2
β“˜Muscovite
var. Illite		9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
β“˜var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Unclassified
β“˜'Orthopyroxene Subgroup'-
β“˜'Olivine Group'-M2SiO4
β“˜'Serpentine Subgroup'-D3[Si2O5](OH)4
β“˜'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
β“˜'Garnet Group'-X3Z2(SiO4)3
β“˜'Pyroxene Group'-ADSi2O6
β“˜'Fayalite-Forsterite Series'-
β“˜'Clinopyroxene Subgroup'-
β“˜'Leucoxene'-
β“˜'Feldspar Group'-
β“˜'Potassium richterite'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Hβ“˜ TalcMg3Si4O10(OH)2
Hβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Hβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ DiamondC
OOxygen
Oβ“˜ AlmandineFe32+Al2(SiO4)3
Oβ“˜ BaryteBaSO4
Oβ“˜ CalciteCaCO3
Oβ“˜ ChromiteFe2+Cr23+O4
Oβ“˜ DiopsideCaMgSi2O6
Oβ“˜ EnstatiteMg2Si2O6
Oβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Oβ“˜ IlmeniteFe2+TiO3
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ PerovskiteCaTiO3
Oβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Oβ“˜ PrideriteK(Ti74+Fe3+)O16
Oβ“˜ PyropeMg3Al2(SiO4)3
Oβ“˜ QuartzSiO2
Oβ“˜ RutileTiO2
Oβ“˜ SpinelMgAl2O4
Oβ“˜ TalcMg3Si4O10(OH)2
Oβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oβ“˜ Pyroxene GroupADSi2O6
Oβ“˜ Garnet GroupX3Z2(SiO4)3
Oβ“˜ Ilmenite var. Picroilmenite(Fe2+,Mg)TiO3
Oβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
Oβ“˜ Olivine GroupM2SiO4
Oβ“˜ Pyrope var. Chromium-bearing PyropeMg3(Al,Cr)2(SiO4)3
NaSodium
Naβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgβ“˜ DiopsideCaMgSi2O6
Mgβ“˜ EnstatiteMg2Si2O6
Mgβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgβ“˜ PyropeMg3Al2(SiO4)3
Mgβ“˜ SpinelMgAl2O4
Mgβ“˜ TalcMg3Si4O10(OH)2
Mgβ“˜ Ilmenite var. Picroilmenite(Fe2+,Mg)TiO3
Mgβ“˜ Pyrope var. Chromium-bearing PyropeMg3(Al,Cr)2(SiO4)3
AlAluminium
Alβ“˜ AlmandineFe32+Al2(SiO4)3
Alβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Alβ“˜ PyropeMg3Al2(SiO4)3
Alβ“˜ SpinelMgAl2O4
Alβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Alβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Alβ“˜ Pyrope var. Chromium-bearing PyropeMg3(Al,Cr)2(SiO4)3
SiSilicon
Siβ“˜ AlmandineFe32+Al2(SiO4)3
Siβ“˜ DiopsideCaMgSi2O6
Siβ“˜ EnstatiteMg2Si2O6
Siβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Siβ“˜ PyropeMg3Al2(SiO4)3
Siβ“˜ QuartzSiO2
Siβ“˜ TalcMg3Si4O10(OH)2
Siβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siβ“˜ Pyroxene GroupADSi2O6
Siβ“˜ Garnet GroupX3Z2(SiO4)3
Siβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
Siβ“˜ Olivine GroupM2SiO4
Siβ“˜ Pyrope var. Chromium-bearing PyropeMg3(Al,Cr)2(SiO4)3
SSulfur
Sβ“˜ BaryteBaSO4
KPotassium
Kβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Kβ“˜ PrideriteK(Ti74+Fe3+)O16
Kβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ DiopsideCaMgSi2O6
Caβ“˜ PerovskiteCaTiO3
Caβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiβ“˜ IlmeniteFe2+TiO3
Tiβ“˜ PerovskiteCaTiO3
Tiβ“˜ PrideriteK(Ti74+Fe3+)O16
Tiβ“˜ RutileTiO2
Tiβ“˜ Ilmenite var. Picroilmenite(Fe2+,Mg)TiO3
CrChromium
Crβ“˜ ChromiteFe2+Cr23+O4
Crβ“˜ Pyrope var. Chromium-bearing PyropeMg3(Al,Cr)2(SiO4)3
FeIron
Feβ“˜ AlmandineFe32+Al2(SiO4)3
Feβ“˜ ChromiteFe2+Cr23+O4
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PrideriteK(Ti74+Fe3+)O16
Feβ“˜ Ilmenite var. Picroilmenite(Fe2+,Mg)TiO3
BaBarium
Baβ“˜ BaryteBaSO4

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Mullen & Murphy (1985).
Dummett, H. T. (1987). Geology and petrography of the Twin Knobs# 1 lamproite, Pike County, Arkansas. Mantle Metasomatism and Alkaline Magmatism, 215, 205.
Rocks & Minerals (1988) 63, 118.
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