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Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA

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Detailed Mineral List:
Albite
Formula: NaAlSi3O8
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 2 other localities in this region.
Albite var: Cleavelandite
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Amblygonite
Formula: LiAl(PO4)F
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Andalusite
Formula: Al2(SiO4)O
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 1 other locality in this region.
'Apatite'
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Beryl
Formula: Be3Al2(Si6O18)
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Localities: Recorded from at least 2 other localities in this region.
Cassiterite
Formula: SnO2
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
'Columbite'
Formula: (Fe,Mn)(Nb,Ta)2O6
Localities: Beecher Lode Bond Claim (Beecher No. 1; Bond Lode), Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
'Columbite-Tantalite'
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: R&M 75:3 pp 156-169
Fluorapatite
Formula: Ca2Ca3(PO4)3F
Reference: R&M 75:3 pp 156-169
Grunerite
Formula: ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Hematite
Formula: Fe2O3
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
'Lepidolite'
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Localities: Recorded from at least 1 other locality in this region.
'Limonite'
Formula: FeO(OH) · nH2O
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Magnetite
Formula: Fe2+Fe3+2O4
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
'Mica Group'
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Microcline
Formula: KAlSi3O8
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 1 other locality in this region.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 2 other localities in this region.
'Perthite'
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Pyrrhotite
Formula: Fe1-xS (x = 0 to 0.17)
Reference: R&M 75:3 pp 156-169
Quartz
Formula: SiO2
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 2 other localities in this region.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: R&M 75:3 pp 156-169
Sillimanite
Formula: Al2(SiO4)O
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
Spodumene
Formula: LiAlSi2O6
Reference: R&M 75:3 pp 156-169; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 32 (Table A-1).
Localities: Recorded from at least 3 other localities in this region.
Spodumene var: Kunzite
Reference: R&M 75:3 pp 156-169
Staurolite
Formula: (Fe2+,Mg,Zn)1.5-2Al9(SiO4)4O6(OH,O)2
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 1 other locality in this region.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Locality: Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA


28 entries listed. 18 valid minerals.
Mineral and/or Locality  
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