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Slate Mountain District, Slate Mountains, El Dorado Co., California, USAi
Regional Level Types
Slate Mountain DistrictMining District
Slate MountainsMountain Range
El Dorado Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
38° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~1km
Locality type:


A few small lode mines and prospects exist in the general vicinity of Slate Mountain, which is in north-central El Dorado County about 10 miles northeast of Placerville and 10 miles southeast of Georgetown. The veins are narrow and occur in slate and schist. Years ago several small but rich surface pockets were recovered. There are several tungsten prospects in the area.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

10 valid minerals.

Detailed Mineral List:

Cacoxenite
Formula: Fe3+24AlO6(PO4)17(OH)12 · 75H2O
Description: Occurs as micro-balls and radiating spheres perched on wavellite.
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 313; www.mineralsocal.org
Crandallite
Formula: CaAl3(PO4)(PO3OH)(OH)6
Colour: Light buff to white
Description: Sugary.
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304; www.mineralsocal.org
Gold
Formula: Au
Hinsdalite
Formula: PbAl3(PO4)(SO4)(OH)6
Colour: Golden yellow to greenish yellow.
Description: Occurs as flakes and masses on quartz.
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 307.
Quartz
Formula: SiO2
Localities: Reported from at least 6 localities in this region.
Quartz var: Smoky Quartz
Formula: SiO2
Reference: www.mineralsocal.org
Rutile
Formula: TiO2
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304; www.mineralsocal.org
Strengite
Formula: FePO4 · 2H2O
Reference: www.mineralsocal.org
Turquoise
Formula: Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Reference: Mineralogical Research Company
Variscite
Formula: AlPO4 · 2H2O
Habit: Tabular; bladed; blocky
Description: Transparent to milky.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 380; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 311; www.mineralsocal.org
Wavellite
Formula: Al3(PO4)2(OH,F)3 · 5H2O
Habit: Prismatic
Colour: Colourless; pale green (massive material)
Description: Occurs as veins and crusts in quartz in well-formed prismatic crystals and massive material.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 383; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 311, 313; www.mineralsocal.org

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 8 - Phosphates, Arsenates and Vanadates
Cacoxenite8.DC.40Fe3+24AlO6(PO4)17(OH)12 · 75H2O
Crandallite8.BL.10CaAl3(PO4)(PO3OH)(OH)6
Hinsdalite8.BL.05PbAl3(PO4)(SO4)(OH)6
Strengite8.CD.10FePO4 · 2H2O
Turquoise8.DD.15Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Variscite8.CD.10AlPO4 · 2H2O
Wavellite8.DC.50Al3(PO4)2(OH,F)3 · 5H2O

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 4 - SIMPLE OXIDES
AX2
Rutile4.4.1.1TiO2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Strengite40.4.1.2FePO4 · 2H2O
Variscite40.4.1.1AlPO4 · 2H2O
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Crandallite42.7.3.1CaAl3(PO4)(PO3OH)(OH)6
(AB)7(XO4)4Zq·xH2O
Turquoise42.9.3.1Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
A3(XO4)2Zq·xH2O
Wavellite42.10.2.1Al3(PO4)2(OH,F)3 · 5H2O
Miscellaneous
Cacoxenite42.13.5.1Fe3+24AlO6(PO4)17(OH)12 · 75H2O
Group 43 - COMPOUND PHOSPHATES, ETC.
Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hinsdalite43.4.1.5PbAl3(PO4)(SO4)(OH)6
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
var: Smoky Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
H CrandalliteCaAl3(PO4)(PO3OH)(OH)6
H StrengiteFePO4 · 2H2O
H VarisciteAlPO4 · 2H2O
H WavelliteAl3(PO4)2(OH,F)3 · 5H2O
H HinsdalitePbAl3(PO4)(SO4)(OH)6
H TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
OOxygen
O CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
O CrandalliteCaAl3(PO4)(PO3OH)(OH)6
O Quartz (var: Smoky Quartz)SiO2
O RutileTiO2
O StrengiteFePO4 · 2H2O
O VarisciteAlPO4 · 2H2O
O WavelliteAl3(PO4)2(OH,F)3 · 5H2O
O QuartzSiO2
O HinsdalitePbAl3(PO4)(SO4)(OH)6
O TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
FFluorine
F WavelliteAl3(PO4)2(OH,F)3 · 5H2O
AlAluminium
Al CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
Al CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Al VarisciteAlPO4 · 2H2O
Al WavelliteAl3(PO4)2(OH,F)3 · 5H2O
Al HinsdalitePbAl3(PO4)(SO4)(OH)6
Al TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
SiSilicon
Si Quartz (var: Smoky Quartz)SiO2
Si QuartzSiO2
PPhosphorus
P CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
P CrandalliteCaAl3(PO4)(PO3OH)(OH)6
P StrengiteFePO4 · 2H2O
P VarisciteAlPO4 · 2H2O
P WavelliteAl3(PO4)2(OH,F)3 · 5H2O
P HinsdalitePbAl3(PO4)(SO4)(OH)6
P TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
SSulfur
S HinsdalitePbAl3(PO4)(SO4)(OH)6
CaCalcium
Ca CrandalliteCaAl3(PO4)(PO3OH)(OH)6
TiTitanium
Ti RutileTiO2
FeIron
Fe CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
Fe StrengiteFePO4 · 2H2O
Fe TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
CuCopper
Cu TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
AuGold
Au GoldAu
PbLead
Pb HinsdalitePbAl3(PO4)(SO4)(OH)6

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lindgren, Waldemar & Henry Ward Turner (1894), Description of the gold belt, California; description of the Placerville sheet: USGS Geol. Atlas, Placerville folio (Folio No. 3) 3 pp.; […(abstract): Jour. Geol.: 4: 248-250 (1896)].
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 120.

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