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Georgetown area occurrences, Georgetown, Georgetown District, East Segment Mother Lode, Mother Lode Belt, El Dorado Co., California, USAi
Regional Level Types
Georgetown area occurrencesGroup of Occurrences
Georgetown- not defined -
Georgetown DistrictMining District
East Segment Mother LodeLode
Mother Lode BeltBelt
El Dorado Co.County
CaliforniaState
USACountry

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Key
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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 38° North , 120° West (est.)
Margin of Error:~2km
Locality type:Group of Occurrences
Köppen climate type:Csa : Hot-summer Mediterranean climate


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Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Mineralogical Record:31(4):345
Galena
Formula: PbS
Reference: Blake, Wm. P. (1857), Note on the occurrence of telluret of silver in California: California Academy of (Natural) Sciences Proceedings: 1: 270; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 218.
Hessite
Formula: Ag2Te
Description: A float specimen was found in 1854.
Reference: Blake, Wm. P. (1857), Note on the occurrence of telluret of silver in California: California Academy of (Natural) Sciences Proceedings: 1: 270; Blake, Wm. P. (1858), Report of a geological reconnaissance in California 370 pp., New York: 302, 303; Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp.: 229.
Ilmenite
Formula: Fe2+TiO3
Description: Occurs in placer sands including as beautiful and complex crystals with brilliant faces to 1 inch (2.5 cm) diameter.
Reference: Blake, Wm. P. (1858), Report of a geological reconnaissance in California 370 pp., New York: 303; Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp.: 260.; Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 105; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 226; Mineralogical Record (2000): 31(4): 345.
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: Occurs as an alteration product of nontronite.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 280.
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Reference: AmMin 64:728
Nontronite
Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Description: Occurs altered/altering to limonite.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 280.
Quartz
Formula: SiO2
Reference: Mineralogical Record:31(4):345

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Hessite2.BA.60Ag2Te
Group 4 - Oxides and Hydroxides
Ilmenite4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
Group 9 - Silicates
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Margarite9.EC.30CaAl2(Al2Si2O10)(OH)2
Nontronite9.EC.40Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Hessite2.4.2.1Ag2Te
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Margarite71.2.2c.1CaAl2(Al2Si2O10)(OH)2
Sheets of 6-membered rings with 2:1 clays
Nontronite71.3.1a.3Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H MargariteCaAl2(Al2Si2O10)(OH)2
H NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
H Limonite(Fe,O,OH,H2O)
OOxygen
O QuartzSiO2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O IlmeniteFe2+TiO3
O MargariteCaAl2(Al2Si2O10)(OH)2
O NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
O Limonite(Fe,O,OH,H2O)
NaSodium
Na NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al MargariteCaAl2(Al2Si2O10)(OH)2
Al NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
SiSilicon
Si QuartzSiO2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si MargariteCaAl2(Al2Si2O10)(OH)2
Si NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
SSulfur
S GalenaPbS
CaCalcium
Ca MargariteCaAl2(Al2Si2O10)(OH)2
TiTitanium
Ti IlmeniteFe2+TiO3
FeIron
Fe IlmeniteFe2+TiO3
Fe NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Fe Limonite(Fe,O,OH,H2O)
AgSilver
Ag HessiteAg2Te
TeTellurium
Te HessiteAg2Te
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Blake, Wm. P. (1857), Note on the occurrence of telluret of silver in California: California Academy of (Natural) Sciences Proceedings: 1: 270.
Blake, Wm. P. (1858), Report of a geological reconnaissance in California 370 pp., New York: 302, 303.
Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp. (includes catalog of minerals of California pp. 63-410), and miscellaneous observations on mineral products): 229, 260.
Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 105.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 218, 226, 280.


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