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Pennsylvania Mine, Sugarloaf Mountain, Black Wonder Mining District, Santa Clara County, California, USAi
Regional Level Types
Pennsylvania MineMine
Sugarloaf MountainMountain
Black Wonder Mining DistrictMining District
Santa Clara CountyCounty
CaliforniaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
37° 20' 11'' North , 121° 29' 30'' West
Latitude & Longitude (decimal):
37.33639,-121.49167
GeoHash:
G#: 9q9s7kukn
GRN:
N25W70
Type:
Mine
Köppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Diablo Grande826 (2017)19.9km
Morgan Hill42,948 (2017)27.0km
East Foothills8,269 (2011)29.2km
Alum Rock15,536 (2018)29.8km
San Martin7,027 (2011)29.9km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Santa Clara Valley Gem & Mineral SocietySan Jose, California36km
Livermore Valley LithophilesLivermore, California45km
Mindat Locality ID:
25078
Long-form identifier:
mindat:1:2:25078:7
GUID (UUID V4):
9cb4b85c-a2c4-4ff2-a1e8-1869e3029a36


A Mn occurrence/mine located in the center SW¼ sec. 12, T7S, R4E, MDM, on the divide between Bollinger Canyon on the N and Arroyo Bayo on the S, W of Jumpoff Creek, on private land (private lease). Discovered in 1917. Owned by M. M. O. Day, California (1974). Operated by Noble Electric Steel Company (1974). MRDS database stated accuracy for this location is 500 meters.

Mineralization is hosted in Late Cretaceous chert. The orebody is a thick, stumpy lens enclosed in thick-bedded white to buff chert. The main lens is 30 feet (ca. 9 m) long with a maximum thickness of 6 feet (1.83 m), striking N15W and dipping 60SW. The chert is in a fault and in contact with Franciscan sandstone. Very little Mn oxide is present in the main orebody, mainly along seams and cracks. The ore is principally brown bementite, some with rhodochrosite. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).

Workings include surface openings.

Analytical data results: The average grade of the ore is 25% Mn.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


19 valid minerals. 2 (TL) - type locality of 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:

ⓘ Baryte
Formula: BaSO4
ⓘ Bementite
Formula: Mn7Si6O15(OH)8
References:
Locality descriptionIdentification: Visual Identification
ⓘ Braunite
Formula: Mn2+Mn3+6(SiO4)O8
ⓘ Calcite
Formula: CaCO3
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Copper
Formula: Cu
ⓘ Cristobalite
Formula: SiO2
ⓘ Franciscanite (TL)
Formula: Mn2+6(V5+,◻)2(SiO4)2(O,OH)6
Type Locality:
ⓘ Gageite
Formula: Mn21(Si4O12)2O3(OH)20
ⓘ Harmotome
Formula: Ba2(Si12Al4)O32 · 12H2O
ⓘ Hausmannite
Formula: Mn2+Mn3+2O4
ⓘ Howieite
Formula: Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Description: Manganoan material.
ⓘ Kutnohorite
Formula: CaMn2+(CO3)2
Description: Calcian material.
ⓘ Quartz
Formula: SiO2
ⓘ Rhodochrosite
Formula: MnCO3
ⓘ Rhodonite
Formula: CaMn3Mn[Si5O15]
Description: Calcian material.
ⓘ Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘ Santaclaraite (TL)
Formula: CaMn4[Si5O14OH](OH) · H2O
Type Locality:
Colour: Pink
ⓘ Sonolite
Formula: Mn2+9(SiO4)4(OH)2
ⓘ 'Wad'

Gallery:

Mn2+6(V5+,◻)2(SiO4)2(O,OH)6ⓘ Franciscanite (TL)
Mn21(Si4O12)2O3(OH)20ⓘ Gageite
CaMn4[Si5O14OH](OH) · H2Oⓘ Santaclaraite (TL)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘCopper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2
Group 4 - Oxides and Hydroxides
ⓘHausmannite4.BB.10Mn2+Mn3+2O4
ⓘQuartz4.DA.05SiO2
ⓘCristobalite4.DA.15SiO2
Group 5 - Nitrates and Carbonates
ⓘRhodochrosite5.AB.05MnCO3
ⓘCalcite5.AB.05CaCO3
ⓘKutnohorite5.AB.10CaMn2+(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Group 9 - Silicates
ⓘSonolite9.AF.55Mn2+9(SiO4)4(OH)2
ⓘFranciscanite (TL)9.AF.75Mn2+6(V5+,◻)2(SiO4)2(O,OH)6
ⓘBraunite9.AG.05Mn2+Mn3+6(SiO4)O8
ⓘRiebeckite9.DE.25◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘGageite9.DH.35Mn21(Si4O12)2O3(OH)20
ⓘHowieite9.DH.65Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
ⓘRhodonite9.DK.05CaMn3Mn[Si5O15]
ⓘSantaclaraite (TL)9.DK.10CaMn4[Si5O14OH](OH) · H2O
ⓘBementite9.EE.05Mn7Si6O15(OH)8
ⓘHarmotome9.GC.10Ba2(Si12Al4)O32 · 12H2O
Unclassified
ⓘ'Wad'-

List of minerals for each chemical element

HHydrogen
Hⓘ BementiteMn7Si6O15(OH)8
Hⓘ FranciscaniteMn62+(V5+,◻)2(SiO4)2(O,OH)6
Hⓘ GageiteMn21(Si4O12)2O3(OH)20
Hⓘ HarmotomeBa2(Si12Al4)O32 · 12H2O
Hⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Hⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Hⓘ SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
Hⓘ SonoliteMn92+(SiO4)4(OH)2
CCarbon
Cⓘ CalciteCaCO3
Cⓘ KutnohoriteCaMn2+(CO3)2
Cⓘ RhodochrositeMnCO3
OOxygen
Oⓘ BaryteBaSO4
Oⓘ BementiteMn7Si6O15(OH)8
Oⓘ BrauniteMn2+Mn63+(SiO4)O8
Oⓘ CalciteCaCO3
Oⓘ CristobaliteSiO2
Oⓘ FranciscaniteMn62+(V5+,◻)2(SiO4)2(O,OH)6
Oⓘ GageiteMn21(Si4O12)2O3(OH)20
Oⓘ HarmotomeBa2(Si12Al4)O32 · 12H2O
Oⓘ HausmanniteMn2+Mn23+O4
Oⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Oⓘ KutnohoriteCaMn2+(CO3)2
Oⓘ QuartzSiO2
Oⓘ RhodochrositeMnCO3
Oⓘ RhodoniteCaMn3Mn[Si5O15]
Oⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Oⓘ SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
Oⓘ SonoliteMn92+(SiO4)4(OH)2
NaSodium
Naⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Naⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
AlAluminium
Alⓘ HarmotomeBa2(Si12Al4)O32 · 12H2O
Alⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
SiSilicon
Siⓘ BementiteMn7Si6O15(OH)8
Siⓘ BrauniteMn2+Mn63+(SiO4)O8
Siⓘ CristobaliteSiO2
Siⓘ FranciscaniteMn62+(V5+,◻)2(SiO4)2(O,OH)6
Siⓘ GageiteMn21(Si4O12)2O3(OH)20
Siⓘ HarmotomeBa2(Si12Al4)O32 · 12H2O
Siⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Siⓘ QuartzSiO2
Siⓘ RhodoniteCaMn3Mn[Si5O15]
Siⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Siⓘ SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
Siⓘ SonoliteMn92+(SiO4)4(OH)2
SSulfur
Sⓘ BaryteBaSO4
Sⓘ ChalcopyriteCuFeS2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ KutnohoriteCaMn2+(CO3)2
Caⓘ RhodoniteCaMn3Mn[Si5O15]
Caⓘ SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
VVanadium
Vⓘ FranciscaniteMn62+(V5+,◻)2(SiO4)2(O,OH)6
MnManganese
Mnⓘ BementiteMn7Si6O15(OH)8
Mnⓘ BrauniteMn2+Mn63+(SiO4)O8
Mnⓘ FranciscaniteMn62+(V5+,◻)2(SiO4)2(O,OH)6
Mnⓘ GageiteMn21(Si4O12)2O3(OH)20
Mnⓘ HausmanniteMn2+Mn23+O4
Mnⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Mnⓘ KutnohoriteCaMn2+(CO3)2
Mnⓘ RhodochrositeMnCO3
Mnⓘ RhodoniteCaMn3Mn[Si5O15]
Mnⓘ SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
Mnⓘ SonoliteMn92+(SiO4)4(OH)2
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Feⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
CuCopper
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ CopperCu
BaBarium
Baⓘ BaryteBaSO4
Baⓘ HarmotomeBa2(Si12Al4)O32 · 12H2O

Other Databases

Link to USGS MRDS:10111042

Other Regions, Features and Areas containing this locality

North America
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.

References

U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060850031.
Davis, Fenelon Francis and C.W. Jennings (1954) Mines and mineral resources of Santa Clara County, California. California Journal of Mines and Geology (Report 50): 50(2): 415.
Ohashi, Yoshikazu, Finger, Larry W. (1981) The crystal structure of santaclaraite, CaMn4[Si5O14(OH)](OH)·H2O: the role of hydrogen atoms in the pyroxenoid structure. American Mineralogist, 66 (1-2) 154-168
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Erd, R.C., Ohashi, Y. (1984) Santaclaraite, a new calcium-manganese silicate hydrate from California. American Mineralogist, 69(1-2), 200-206.
Dunn, Pete J., Peacor, Donald R., Erd, Richard C., Ramik, Robert A. (1986) Franciscanite and ürebroite, two new minerals from California and Sweden, related to redefined welinite. American Mineralogist, 71 (11-12) 1522-1526
www.mineralsocal.org (n.d.) http://www.mineralsocal.org/scfm/index.html
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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