Unspecified road cuts, Intersection Texas routes 118 & 166, Nunn Hill, Jeff Davis County, Texas, USAi
| Regional Level Types | |
|---|---|
| Unspecified road cuts | Group of Road Cuttings |
| Intersection Texas routes 118 & 166 | - not defined - |
| Nunn Hill | Hill |
| Jeff Davis County | County |
| Texas | State |
| USA | Country |
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Latitude & Longitude (WGS84):
30° 47' North , 104° 10' West
Latitude & Longitude (decimal):
Type:
Group of Road Cuttings
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fort Davis | 1,201 (2011) | 33.9km |
| Valentine | 123 (2017) | 38.3km |
| Balmorhea | 523 (2017) | 46.0km |
| Marfa | 1,733 (2017) | 54.4km |
A series of road cuts on Texas Routes 118 and 166. The junction of these two roads is about 20 miles south of Kent, TX and 20 miles NW of Fort Davis, TX.
NOTE: Coordinates for the road intersection are provided in the file for that element of the locality string.
Steve Stuart obtained an egg carton of material from the giveaway table at the 2012 Rochester Symposium's Micromounter's Playroom. The locality was given as 'Route 166 Roadcut, 35-40 miles south of Kent, Jeff Davis County, Texas'. Minerals listed include cryptomelane, tridymite, opal and chalcedony. The material was contributed by Janet and Paul Clifford. Subsequent investigation indicates that the material may have been collected by Tom Tucker and Erich Grundel from 2007 through 2010. Mr. Grundel gave a presentation on the Texas roadcuts at the 2010 Rochester Mineralogical Symposium; an abstract appears in Rocks and Minerals, Vol. 86, No. 3, May/June 2011, p. 271. Communication with Tom puts the locality on Rte 118, about 1-2 miles NW of the intersection with Rte. 166. See the link to a Mindat thread Steve started after the Rochester Symposium, listed below.
Additional minerals to be found include:
Cryptomelane (XRD analysis by Tom Tucker)
Fluorite
Tridymite
Pyrite
Barite?
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Cryptomelane Formula: K(Mn4+7Mn3+)O16 |
| ⓘ Goethite Formula: Fe3+O(OH) |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Chalcedony Formula: SiO2 |
| ⓘ Zircon Formula: Zr(SiO4) |
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | Cryptomelane | 4.DK.05a | K(Mn4+7Mn3+)O16 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 9 - Silicates | |||
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Goethite | Fe3+O(OH) |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Cryptomelane | K(Mn74+Mn3+)O16 |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Zircon | Zr(SiO4) |
| Si | Silicon | |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Zircon | Zr(SiO4) |
| K | Potassium | |
| K | ⓘ Cryptomelane | K(Mn74+Mn3+)O16 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Mn | Manganese | |
| Mn | ⓘ Cryptomelane | K(Mn74+Mn3+)O16 |
| Fe | Iron | |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Permian BasinBasin
- Shawnee DomainDomain
- Sierra Madre OrientalWide Rift
- Tascotal BasinBasin
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Unspecified road cuts, Intersection Texas routes 118 & 166, Nunn Hill, Jeff Davis County, Texas, USA