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Fort Point, San Francisco, San Francisco County, California, USAi
Regional Level Types
Fort PointPoint
San FranciscoCity
San Francisco CountyCounty
CaliforniaState
USACountry

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PhotosMapsSearch
06697950017272256084337.jpg
Riebeckite

Fort Point, San Francisco, San Francisco County, California, USA
01589240017272256091037.jpg
Hydromagnesite

Fort Point, San Francisco, San Francisco County, California, USA
07701360017272256096882.jpg
Aragonite

Fort Point, San Francisco, San Francisco County, California, USA
06697950017272256084337.jpg
Riebeckite

Fort Point, San Francisco, San Francisco County, California, USA
01589240017272256091037.jpg
Hydromagnesite

Fort Point, San Francisco, San Francisco County, California, USA
07701360017272256096882.jpg
Aragonite

Fort Point, San Francisco, San Francisco County, California, USA
06697950017272256084337.jpg
Riebeckite

Fort Point, San Francisco, San Francisco County, California, USA
01589240017272256091037.jpg
Hydromagnesite

Fort Point, San Francisco, San Francisco County, California, USA
Latitude & Longitude (WGS84):
37° 48' 38'' North , 122° 28' 35'' West
Latitude & Longitude (decimal):
37.81056,-122.47639
GRN:
N26W69
Type:
Point
Köppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Sausalito7,156 (2017)5.4km
Chinatown100,574 (2017)6.2km
San Francisco864,816 (2017)6.4km
Belvedere2,121 (2018)7.0km
Marin City2,666 (2011)7.1km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
San Francisco Gem and Mineral Society, Inc.San Francisco, California6km
Northern California Geological SocietyOrinda, California27km
East Bay Mineral and Lapidary ClubHayward, California37km
Vallejo Gem & Mineral SocietyVallejo, California38km
Mineral & Gem Society of Castro ValleyHayward, California38km
Mindat Locality ID:
131293
Long-form identifier:
mindat:1:2:131293:8
GUID (UUID V4):
0


Both a cape and a historical military fort, with a beach (strand) area, under the southern terminus of the Golden Gate Bridge.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

15 valid minerals.

Detailed Mineral List:

ⓘ Antigorite
Formula: Mg3(Si2O5)(OH)4
ⓘ 'Apophyllite Group'
Formula: AB4[Si8O22]X · 8H2O
ⓘ Aragonite
Formula: CaCO3
Habit: Slender prisms
Colour: Colourless
Description: Occurs in seams in serpentine.
ⓘ Baryte
Formula: BaSO4
Habit: Tabular
Description: Occurs as crystals in seams in serpentine.
ⓘ Calcite
Formula: CaCO3
Description: Occurs as crystals exhibiting uncommon faces to several cm in size.
ⓘ Coalingite
Formula: Mg10Fe3+2(OH)24[CO3] · 2H2O
Colour: Golden-brown
Description: Occurs as veinlets 1 to 2 mm thick in serpentine that is largely altered to pyroaurite.
ⓘ Datolite
Formula: CaB(SiO4)(OH)
Colour: White
Description: Occurs as glassy crystals and white veins in an altered diabase dike in serpentine.
ⓘ Gyrolite
Formula: NaCa16Si23AlO60(OH)8 · 14H2O
Description: Occurs as spherical or massive with apophyllite; platy or plumose aggregates replacing wall rock in fissures of basalt.
ⓘ Hydromagnesite
Formula: Mg5(CO3)4(OH)2 · 4H2O
Description: Occurs as veins in basalt.
ⓘ Magnesite
Formula: MgCO3
Description: Occurs as seams in serpentine.
ⓘ Nesquehonite
Formula: MgCO3 · 3H2O
Colour: White
Description: Soft surface efflorescences in moist places in serpentine.
ⓘ Pectolite
Formula: NaCa2Si3O8(OH)
Description: Occurs as veins of fibrous material in an altered dike that intersects serpentine.
ⓘ Pyroaurite
Formula: Mg6Fe3+2(OH)16[CO3] · 4H2O
ⓘ 'Pyroaurite-2H'
Formula: Mg6Fe3+2(OH)16(CO3) · 4H2O
Description: Occurws as thin coatings with hydromagnesite on fractures in serpentine.
ⓘ Quartz
Formula: SiO2
Description: Occurs as pseudomorphs after apophyllite.
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Wollastonite
Formula: Ca3(Si3O9)
ⓘ Xonotlite
Formula: Ca6(Si6O17)(OH)2
Description: Occurs as veins in basalt.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘMagnesite5.AB.05MgCO3
ⓘAragonite5.AB.15CaCO3
ⓘNesquehonite5.CA.05MgCO3 · 3H2O
ⓘHydromagnesite5.DA.05Mg5(CO3)4(OH)2 · 4H2O
ⓘ'Pyroaurite-2H'5.DA.45Mg6Fe3+2(OH)16(CO3) · 4H2O
ⓘPyroaurite5.DA.50Mg6Fe3+2(OH)16[CO3] · 4H2O
ⓘCoalingite5.DA.55Mg10Fe3+2(OH)24[CO3] · 2H2O
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Group 9 - Silicates
ⓘDatolite9.AJ.20CaB(SiO4)(OH)
ⓘPectolite9.DG.05NaCa2Si3O8(OH)
ⓘWollastonite9.DG.05Ca3(Si3O9)
ⓘXonotlite9.DG.35Ca6(Si6O17)(OH)2
ⓘAntigorite9.ED.15Mg3(Si2O5)(OH)4
ⓘGyrolite9.EE.30NaCa16Si23AlO60(OH)8 · 14H2O
Unclassified
ⓘ'Apophyllite Group'-AB4[Si8O22]X · 8H2O
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ AntigoriteMg3(Si2O5)(OH)4
Hⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Hⓘ CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Hⓘ DatoliteCaB(SiO4)(OH)
Hⓘ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Hⓘ HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Hⓘ NesquehoniteMgCO3 · 3H2O
Hⓘ PectoliteNaCa2Si3O8(OH)
Hⓘ PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Hⓘ Pyroaurite-2HMg6Fe23+(OH)16(CO3) · 4H2O
Hⓘ XonotliteCa6(Si6O17)(OH)2
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
BBoron
Bⓘ DatoliteCaB(SiO4)(OH)
CCarbon
Cⓘ AragoniteCaCO3
Cⓘ CalciteCaCO3
Cⓘ CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Cⓘ HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Cⓘ MagnesiteMgCO3
Cⓘ NesquehoniteMgCO3 · 3H2O
Cⓘ PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Cⓘ Pyroaurite-2HMg6Fe23+(OH)16(CO3) · 4H2O
OOxygen
Oⓘ AntigoriteMg3(Si2O5)(OH)4
Oⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Oⓘ AragoniteCaCO3
Oⓘ BaryteBaSO4
Oⓘ CalciteCaCO3
Oⓘ CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Oⓘ DatoliteCaB(SiO4)(OH)
Oⓘ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Oⓘ HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Oⓘ MagnesiteMgCO3
Oⓘ NesquehoniteMgCO3 · 3H2O
Oⓘ PectoliteNaCa2Si3O8(OH)
Oⓘ PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Oⓘ QuartzSiO2
Oⓘ Pyroaurite-2HMg6Fe23+(OH)16(CO3) · 4H2O
Oⓘ WollastoniteCa3(Si3O9)
Oⓘ XonotliteCa6(Si6O17)(OH)2
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
NaSodium
Naⓘ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Naⓘ PectoliteNaCa2Si3O8(OH)
MgMagnesium
Mgⓘ AntigoriteMg3(Si2O5)(OH)4
Mgⓘ CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Mgⓘ HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Mgⓘ MagnesiteMgCO3
Mgⓘ NesquehoniteMgCO3 · 3H2O
Mgⓘ PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Mgⓘ Pyroaurite-2HMg6Fe23+(OH)16(CO3) · 4H2O
AlAluminium
Alⓘ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
SiSilicon
Siⓘ AntigoriteMg3(Si2O5)(OH)4
Siⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Siⓘ DatoliteCaB(SiO4)(OH)
Siⓘ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Siⓘ PectoliteNaCa2Si3O8(OH)
Siⓘ QuartzSiO2
Siⓘ WollastoniteCa3(Si3O9)
Siⓘ XonotliteCa6(Si6O17)(OH)2
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
SSulfur
Sⓘ BaryteBaSO4
CaCalcium
Caⓘ AragoniteCaCO3
Caⓘ CalciteCaCO3
Caⓘ DatoliteCaB(SiO4)(OH)
Caⓘ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Caⓘ PectoliteNaCa2Si3O8(OH)
Caⓘ WollastoniteCa3(Si3O9)
Caⓘ XonotliteCa6(Si6O17)(OH)2
FeIron
Feⓘ CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Feⓘ PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Feⓘ Pyroaurite-2HMg6Fe23+(OH)16(CO3) · 4H2O
BaBarium
Baⓘ BaryteBaSO4

Localities in this Region

USA
  • California

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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

www.dvminerals.com/thumbs.html
www.missourigeologists.org/Min-Loc1-2005.pdf.
rruff.geo.arizona.edu/doclib/hom/hydromagnesite.pdf
Mining and Scientific Press (1881), Formation of the San Francisco peninsula: Mining and Scientific Press: 42: 28
Eakle, Arthur Starr (1901), Mineralogical notes; with chemical analyses by W.T. Schaller: University of California, Department of Geological Science Bulletin: 2: 316, 317.
Schaller, Waldemar Theodore (1904), Notes on some California minerals: American Journal of Science, 4th. Series: 17: 191-194
Kunz, George F. (1905) Gems, Jewelers' Materials, and Ornamental Stones of California. Bulletin 37 (2nd ed.) California State Mining Bureau
Schaller, Waldemar Theodore (1905b), Mineralogical notes: USGS Bulletin 262: 121-144.
Schaller, W. T. (1911) Mineralogical notes, series 1. Bulletin 490. US Geological Survey 109 pp. doi:10.3133/b490 p.103
Bailey, Edgar H. (1941) Skeletonized apophyllite from Crestmore and Riverside, California. American Mineralogist, 26 (9) 565-567
Learned, E. (1965) Sjogrenite confirmed from California. Gems and Minerals: 332: 54
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 80, 82, 98, 118, 166, 212, 222, 249, 285, 315, 340, 387.
Schlocker, J. (1974) Geology of the San Francisco North quadrangle. USGS Professional Paper 782, 109 pp.: 59, 60, 62.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Cook, Robert B. (2010) Connoisseur's Choice: Datolite, Dalnegorsk, Primorskiy Kray, Russia. Rocks & Minerals, 85 (4). 338-345 doi:10.1080/00357529.2010.492658
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