SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Georgetown District, East Segment Mother Lode, Mother Lode Belt, El Dorado Co., California, USAi
Regional Level Types
Georgetown DistrictMining District
East Segment Mother LodeLode
Mother Lode BeltBelt
El Dorado Co.County
CaliforniaState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
Key
Latitude & Longitude (WGS84):
38° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~2km
Locality type:


Location
The Georgetown district is in northwestern El Dorado County at the north end of the northeast segment of the Mother Lode belt. It extends from just north of Garden Valley north through Georgetown and the Georgia Slide area to the Middle Fork of the American River. It is both a lode- and placer-mining district.

History
Mining began here in 1849 by a party of placer miners from Oregon. The site was first known as Growlersburg, but was soon changed to Georgetown. It is reported to have been named for either George Ehrenhaft, who laid out the town, or George Phipps, a sailor-prospector. The placers were highly productive during the 1850s. The seam deposits at Georgia Slide were mined on a large scale by hydraulicking from 1853 to about 1895. There was some activIty during the early 1900s, and in the 1930s the Beebe and Alpine mines were worked on a fairly large scale. There has been minor prospecting and skin diving in the district since.

Geology
This district is in the northern end of the Mother Lode gold belt (see fig. 4). There is a two-mile wide north- and northwest-trending belt of Mariposa slate (Upper Jurassic) in the central portion of the district, with greenstone and green schist to the west and mica schist, slate, quartzite, amphibolite, and serpentine to the east. In places, especially at Georgia Slide, the bedrock is deeply weathered. Several patches of Tertiary gravel overlain by andesite are exposed on some hills in the northern part.

Ore Deposits
The ore deposits consist of thick zonettf mineralized schist and slate that contain numerous quartz veins and veinlets. Where deeply weathered the gold became concentrated and such deposits were worked by placer-mining methods. These are known as "seam" deposits. Below the weathered zone they were mined as lode deposits. The seam deposit at Georgia Slide was 1000 feet long and 500 feet wide. Usually the milling ore yielded from 1/7 to 1/5 ounce to the ton, but many high-grade pockets were encountered. In addition, there are several wide quartz veins containing finely disseminated free gold and pyrite. These veins contained ore shoots with stoping lengths of up to 500 feet. The Tertiary gravel patches have yielded gold.

MinesLode-seam: Alpine ($500,000+), Alma, Barney, Beebe ($2 million), California Jack, Cove Hill, Georgia Slide ($6 million), Mamaluke, Mount Hope.
Placer: Anderson, Bottle Hill, Cary, Cement Hill, Holmes, Jones Hill, Little Chief, Mulvey Point, Patterson, Rowe, Shoemaker, Tanksley, Trimble.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

29 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10086458.
Anatase
Formula: TiO2
Reference: Mineralogical Record (2000): 31(4): 345.
Brookite
Formula: TiO2
Reference: Mineralogical Record (2000): 31(4): 345.
Calcite
Formula: CaCO3
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10086458.
'Chlorite Group'
Chromite
Formula: Fe2+Cr3+2O4
Chrysotile
Formula: Mg3(Si2O5)(OH)4
Reference: Logan, Clarence August (1938), Mineral resources of El Dorado County: California Journal of Mines and Geology, California Division Mines (Report 34): 34(3): 207; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 335.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Clinochlore var: Chromian Clinochlore
Formula: Mg5(Al,Cr)2Si3O10(OH)8
Reference: Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951), Chromite deposits of El Dorado County, California: California Division Mines Bulletin 134, part III, Chapter 4: 122-162; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 434.
Copper
Formula: Cu
Diopside
Formula: CaMgSi2O6
Colour: White
Description: Massive material and lath-like crystals to 7 mm wide; resembles vesuvianite.
Reference: Pabst, Adolf (1936), Vesuvianite from Georgetown, California: American Mineralogist: 21: 2; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 386, 489; www.mineralsocal.org.; Len Pisciotta (2019) White grossular from near the Stifle claim, Georgetown, El Dorado County, California. Mineralogical Record 50:713-717
Enargite
Formula: Cu3AsS4
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 175.
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.
Gold
Formula: Au
Localities: Reported from at least 37 localities in this region.
Graphite
Formula: C
Reference: Guidott, C.V., Post, J.L., and Cheney, J.T. (1979) Margarite pseudomorphs after chiastolite in the Georgetown area, California. American Mineralogist: 64: 728-732; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 431.
Grossular
Formula: Ca3Al2(SiO4)3
Habit: trapezohedral
Colour: Pure white
Fluorescence: Bright pink-orange in LW
Description: Occurs in veinlets in serpentine.
Reference: Pabst, Adolf (1936), Vesuvianite from Georgetown, California: American Mineralogist: 21: 2; Deer, W.A., R.A. Howie, and J. Sussman (1962) Rock-forming Minerals, volume I, John Wiley and Sons, New York: 94; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 495; www.mineralsocal.org.; Len Pisciotta (2019) White grossular from near the Stifle claim, Georgetown, El Dorado County, California. Mineralogical Record 50:713-717
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)
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as sericite schist surrounding fine-grained chert.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030033.
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.
Opal
Formula: SiO2 · nH2O
Reference: Len Pisciotta (2019) White grossular from near the Stifle claim, Georgetown, El Dorado County, California. Mineralogical Record 50:713-717
Paragonite
Formula: NaAl2(AlSi3O10)(OH)2
Description: Occurs in graphitic metapelites.
Reference: Guidott, C.V., Post, J.L., and Cheney, J.T. (1979) Margarite pseudomorphs after chiastolite in the Georgetown area, California. American Mineralogist: 64: 728-732; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 431.
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Description: Occurs in veinlets.
Reference: Pabst, Adolf (1936), Vesuvianite from Georgetown, California: American Mineralogist: 21: 2; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 386, 489; www.mineralsocal.org.; Len Pisciotta (2019) White grossular from near the Stifle claim, Georgetown, El Dorado County, California. Mineralogical Record 50:713-717
'Psilomelane'
Formula: Mn, O
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030033.
Pyrite
Formula: FeS2
Pyrite var: Auriferous Pyrite
Formula: FeS2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310587.
Pyrolusite
Formula: Mn4+O2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030033.
Quartz
Formula: SiO2
Localities: Reported from at least 29 localities in this region.
Quartz var: Smoky Quartz
Formula: SiO2
Reference: A&M photo
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Pabst, Adolf (1936), Vesuvianite from Georgetown, California: American Mineralogist: 21: 2; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 193.
'Serpentine Subgroup var: Picrolite'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Collected by Matthew Stanley in 2014
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: Len Pisciotta (2019) White grossular from near the Stifle claim, Georgetown, El Dorado County, California. Mineralogical Record 50:713-717
Uvarovite
Formula: Ca3Cr2(SiO4)3
Reference: Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951), Chromite deposits of El Dorado County, California: California Division Mines Bulletin 134, part III, Chapter 4: 122-162; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 495.
Vesuvianite
Formula: Ca19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Wulfenite
Formula: Pb(MoO4)
Description: Occurs as small grains.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 388.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Gold1.AA.05Au
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
Enargite2.KA.05Cu3AsS4
Galena2.CD.10PbS
Hessite2.BA.60Ag2Te
Pyrite2.EB.05aFeS2
var: Auriferous Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Brookite4.DD.10TiO2
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Opal4.DA.10SiO2 · nH2O
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Wulfenite7.GA.05Pb(MoO4)
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Chrysotile9.ED.15Mg3(Si2O5)(OH)4
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Chromian Clinochlore9.EC.55Mg5(Al,Cr)2Si3O10(OH)8
Diopside9.DA.15CaMgSi2O6
Grossular9.AD.25Ca3Al2(SiO4)3
Margarite9.EC.30CaAl2(Al2Si2O10)(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Nontronite9.EC.40Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Paragonite9.EC.15NaAl2(AlSi3O10)(OH)2
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Uvarovite9.AD.25Ca3Cr2(SiO4)3
Vesuvianite9.BG.35Ca19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)
'Psilomelane'-Mn, O
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
'var: Picrolite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Gold1.1.1.1Au
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Hessite2.4.2.1Ag2Te
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 4
Enargite3.2.1.1Cu3AsS4
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Anatase4.4.4.1TiO2
Brookite4.4.5.1TiO2
Pyrolusite4.4.1.4Mn4+O2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Grossular51.4.3b.2Ca3Al2(SiO4)3
Uvarovite51.4.3b.3Ca3Cr2(SiO4)3
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Vesuvianite58.2.4.1Ca19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Chrysotile71.1.5.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Margarite71.2.2c.1CaAl2(Al2Si2O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Paragonite71.2.2a.2NaAl2(AlSi3O10)(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 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(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)
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
Clinochlore
var: Chromian Clinochlore
-Mg5(Al,Cr)2Si3O10(OH)8
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Psilomelane'-Mn, O
Pyrite
var: Auriferous Pyrite
-FeS2
Quartz
var: Smoky Quartz
-SiO2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
'var: Picrolite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H MargariteCaAl2(Al2Si2O10)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H PrehniteCa2Al2Si3O10(OH)2
H VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
H ParagoniteNaAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
H NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
H Limonite(Fe,O,OH,H2O)
H ChrysotileMg3(Si2O5)(OH)4
H Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H OpalSiO2 · nH2O
CCarbon
C GraphiteC
C CalciteCaCO3
OOxygen
O WulfenitePb(MoO4)
O QuartzSiO2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O IlmeniteFe2+TiO3
O MargariteCaAl2(Al2Si2O10)(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O DiopsideCaMgSi2O6
O GrossularCa3Al2(SiO4)3
O PrehniteCa2Al2Si3O10(OH)2
O VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
O ChromiteFe2+Cr23+O4
O PyrolusiteMn4+O2
O PsilomelaneMn, O
O ParagoniteNaAl2(AlSi3O10)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
O UvaroviteCa3Cr2(SiO4)3
O AnataseTiO2
O BrookiteTiO2
O NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
O Limonite(Fe,O,OH,H2O)
O ChrysotileMg3(Si2O5)(OH)4
O Quartz (var: Smoky Quartz)SiO2
O Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O AlbiteNa(AlSi3O8)
O CalciteCaCO3
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O OpalSiO2 · nH2O
NaSodium
Na ParagoniteNaAl2(AlSi3O10)(OH)2
Na NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg DiopsideCaMgSi2O6
Mg VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Mg Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Mg ChrysotileMg3(Si2O5)(OH)4
Mg Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al MargariteCaAl2(Al2Si2O10)(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al GrossularCa3Al2(SiO4)3
Al PrehniteCa2Al2Si3O10(OH)2
Al VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Al ParagoniteNaAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Al NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Al Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al AlbiteNa(AlSi3O8)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si MargariteCaAl2(Al2Si2O10)(OH)2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si DiopsideCaMgSi2O6
Si GrossularCa3Al2(SiO4)3
Si PrehniteCa2Al2Si3O10(OH)2
Si VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Si ParagoniteNaAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Si UvaroviteCa3Cr2(SiO4)3
Si NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Si ChrysotileMg3(Si2O5)(OH)4
Si Quartz (var: Smoky Quartz)SiO2
Si Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si AlbiteNa(AlSi3O8)
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si OpalSiO2 · nH2O
SSulfur
S PyriteFeS2
S EnargiteCu3AsS4
S GalenaPbS
S Pyrite (var: Auriferous Pyrite)FeS2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CaCalcium
Ca MargariteCaAl2(Al2Si2O10)(OH)2
Ca DiopsideCaMgSi2O6
Ca GrossularCa3Al2(SiO4)3
Ca PrehniteCa2Al2Si3O10(OH)2
Ca VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Ca UvaroviteCa3Cr2(SiO4)3
Ca CalciteCaCO3
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
TiTitanium
Ti IlmeniteFe2+TiO3
Ti AnataseTiO2
Ti BrookiteTiO2
CrChromium
Cr ChromiteFe2+Cr23+O4
Cr Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Cr UvaroviteCa3Cr2(SiO4)3
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mn PyrolusiteMn4+O2
Mn PsilomelaneMn, O
Mn Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe IlmeniteFe2+TiO3
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9
Fe ChromiteFe2+Cr23+O4
Fe PyriteFeS2
Fe NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Fe Limonite(Fe,O,OH,H2O)
Fe Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe Pyrite (var: Auriferous Pyrite)FeS2
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Ni Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu CopperCu
Cu EnargiteCu3AsS4
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Zn Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
AsArsenic
As EnargiteCu3AsS4
MoMolybdenum
Mo WulfenitePb(MoO4)
AgSilver
Ag HessiteAg2Te
TeTellurium
Te HessiteAg2Te
AuGold
Au GoldAu
PbLead
Pb WulfenitePb(MoO4)
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Irelan, William, Jr. (1888b), Eighth annual report of the State Mineralogist [includes mineral resources of the State, with contributions by W.A. Goodyear, H.A. Whiting, and Stephen Bowers]: California Mining Bureau. (Report 8), 946 pp.: 167-168.
Clark, W. B., and Carlson, D. W., (1956), El Dorado County, Seam deposits and Georgetown area: California Journal of Mines and Geology (Report 52): 52: 431, 435-437.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 51.

Localities in this Region

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

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.
 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: December 7, 2019 16:41:36 Page generated: November 23, 2019 05:10:27
Go to top of page