Challenge deposit, Redwood City, San Mateo County, California, USAi
| Regional Level Types | |
|---|---|
| Challenge deposit | Deposit |
| Redwood City | City |
| San Mateo County | County |
| California | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
37° 27' 57'' North , 122° 15' 16'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Emerald Lake Hills | 4,278 (2011) | 1.2km |
| Redwood City | 85,288 (2017) | 2.7km |
| Woodside | 5,561 (2017) | 4.0km |
| San Carlos | 29,931 (2017) | 4.6km |
| Atherton | 7,167 (2017) | 5.1km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Sequoia Gem and Mineral Society | Redwood City, California | 3km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 15km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 27km |
| East Bay Mineral and Lapidary Club | Hayward, California | 27km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 35km |
A former Hg deposit/mine located in the approximate center sec. 36, T5S, R4W, MDM, 2.7 km (1.7 miles) SW of Redwood City (center), just inside the western boundary of the city. Owned by A.F. Oddstad, Jr. First produced in 1955. MRDS database accuracy for this location is not stated. Now part of a housing development.
Mineralization is hosted in Late Jurassic-Late Cretaceous serpentinite of the Franciscan Formation. The ore body is irregular. Serpentine occurs as float. The ore is in slump rock and alluvium. Local alteration includes the silica carbonate alteration of serpentine. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 3 (Coast Ranges and Western Klamath Mountains).
Workings included surface openings with an overall width of 15.24 meters. Operations terminated in 1958 so that the area could be developed into a housing area.
Production statistics: Year: 1962 (period = until 1962): estimated ^6 to 10 pounds (3,614 grams) Hg/metric ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
17 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Calomel Formula: [Hg2]2+Cl2 |
| ⓘ Cinnabar Formula: HgS |
| ⓘ Dolomite Formula: CaMg(CO3)2 |
| ⓘ Edgarbaileyite Formula: [Hg2]2+3[Si2O7] |
| ⓘ Eglestonite Formula: [Hg2]2+3OCl3(OH) |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Metacinnabar Formula: HgS |
| ⓘ Montroydite Formula: HgO |
| ⓘ Mosesite Formula: (Hg2N)(Cl,SO4,MoO4) · H2O |
| ⓘ Native Mercury Formula: Hg |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Terlinguaite Formula: [Hg3]4+Hg2+Cl2O2 |
| ⓘ Tiemannite Formula: HgSe |
| ⓘ Tunisite Formula: NaCa2Al4(CO3)4(OH)8Cl |
| ⓘ Wattersite Formula: [Hg2]2+2Hg2+[CrO4]O2 |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Mercury | 1.AD.05 | Hg |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Metacinnabar | 2.CB.05a | HgS |
| ⓘ | Tiemannite | 2.CB.05a | HgSe |
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| Group 3 - Halides | |||
| ⓘ | Calomel | 3.AA.30 | [Hg2]2+Cl2 |
| ⓘ | Eglestonite | 3.DD.05 | [Hg2]2+3OCl3(OH) |
| ⓘ | Terlinguaite | 3.DD.20 | [Hg3]4+Hg2+Cl2O2 |
| ⓘ | Mosesite | 3.DD.30 | (Hg2N)(Cl,SO4,MoO4) · H2O |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Montroydite | 4.AC.15 | HgO |
| ⓘ | Magnesiochromite | 4.BB.05 | MgCr2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| ⓘ | Tunisite | 5.BB.15 | NaCa2Al4(CO3)4(OH)8Cl |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Wattersite | 7.FB.15 | [Hg2]2+2Hg2+[CrO4]O2 |
| Group 9 - Silicates | |||
| ⓘ | Edgarbaileyite | 9.BC.25 | [Hg2]2+3[Si2O7] |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Eglestonite | [Hg2]32+OCl3(OH) |
| H | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| H | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| C | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| N | Nitrogen | |
| N | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| O | ⓘ Edgarbaileyite | [Hg2]32+[Si2O7] |
| O | ⓘ Eglestonite | [Hg2]32+OCl3(OH) |
| O | ⓘ Magnesiochromite | MgCr2O4 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Montroydite | HgO |
| O | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Terlinguaite | [Hg3]4+Hg2+Cl2O2 |
| O | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| O | ⓘ Wattersite | [Hg2]22+Hg2+[CrO4]O2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Na | Sodium | |
| Na | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| Mg | Magnesium | |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Mg | ⓘ Magnesiochromite | MgCr2O4 |
| Al | Aluminium | |
| Al | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| Si | Silicon | |
| Si | ⓘ Edgarbaileyite | [Hg2]32+[Si2O7] |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Metacinnabar | HgS |
| S | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| Cl | Chlorine | |
| Cl | ⓘ Calomel | [Hg2]2+Cl2 |
| Cl | ⓘ Eglestonite | [Hg2]32+OCl3(OH) |
| Cl | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| Cl | ⓘ Terlinguaite | [Hg3]4+Hg2+Cl2O2 |
| Cl | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Ca | ⓘ Tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| Cr | Chromium | |
| Cr | ⓘ Magnesiochromite | MgCr2O4 |
| Cr | ⓘ Wattersite | [Hg2]22+Hg2+[CrO4]O2 |
| Fe | Iron | |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Se | Selenium | |
| Se | ⓘ Tiemannite | HgSe |
| Mo | Molybdenum | |
| Mo | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| Hg | Mercury | |
| Hg | ⓘ Calomel | [Hg2]2+Cl2 |
| Hg | ⓘ Cinnabar | HgS |
| Hg | ⓘ Edgarbaileyite | [Hg2]32+[Si2O7] |
| Hg | ⓘ Eglestonite | [Hg2]32+OCl3(OH) |
| Hg | ⓘ Native Mercury | Hg |
| Hg | ⓘ Metacinnabar | HgS |
| Hg | ⓘ Montroydite | HgO |
| Hg | ⓘ Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| Hg | ⓘ Terlinguaite | [Hg3]4+Hg2+Cl2O2 |
| Hg | ⓘ Tiemannite | HgSe |
| Hg | ⓘ Wattersite | [Hg2]22+Hg2+[CrO4]O2 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
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.
Challenge deposit, Redwood City, San Mateo County, California, USA