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Arcadia meteorite, Valley County, Nebraska, USAi
| Regional Level Types | |
|---|---|
| Arcadia meteorite | Meteorite Fall Location |
| Valley County | County |
| Nebraska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 25' North , 99° 6' West
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Arcadia | 303 (2017) | 2.3km |
| Loup City | 1,012 (2017) | 19.2km |
| Ord | 2,061 (2017) | 25.3km |
| Mason City | 168 (2017) | 27.3km |
| Ansley | 426 (2017) | 27.5km |
Ordinary chondrite, veined (LL6; S1; W)
Find,1937; 19.4 kg
A weathered meteoritic stone with prominent 0.5-1.0 µm thick veins was recovered. Equilibrated olivine (Fa29) and low Ca-orthopyroxene compositions are characteristic of the LL-chondrite geochemical group. Mineralogically, the meteorite consists primarily of olivine and lesser pyroxene with minor amounts of plagioclase, troilite, and Fe-Ni metal. Troilite is more abundant than Fe-Ni (predominantly or exclusively kamacite). Troilite is usually more abundant than Fe-Ni metal in LL chondrites — but extensive weathering has presumably altered the original pre-terrestrial proportions. Accessory chromite, copper, and ilmenite are also reported. Sharp extinction of olivine and plagioclase are consistent with relatively mild level S1 shock. Weathering of the troilite has produced both goethite and marcasite.
The LL (relatively very low in total iron) chondrites are the third largest group of ordinary chondrites and represent ~8% of all recovered and classified witnessed falls. A cosmic ray exposure (CRE) age of 6.8 Ma has been reported.
Moderately large specimens are held at The Center for Meteorite Studies at Arizona State University (2.3035 kg in 2016) and the United States National Museum in Washington, D.C (1.465 kg in 2017).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
8 valid minerals.
Meteorite/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 DiagramDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Goethite Formula: Fe3+O(OH) |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Marcasite Formula: FeS2 Description: Terrestrial weatherate. |
| ⓘ Native Copper Formula: Cu |
| ⓘ Native Iron Formula: Fe |
| ⓘ Native Iron var. Kamacite Formula: (Fe,Ni) |
| ⓘ 'Orthopyroxene Subgroup' Description: Orthopyroxene (variety, hypersthene) consistent with LL classification. |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ Troilite Formula: FeS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Copper | 1.AA.05 | Cu |
| ⓘ | Native Iron | 1.AE.05 | Fe |
| ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Troilite | 2.CC.10 | FeS |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Goethite | Fe3+O(OH) |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Na | Sodium | |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mg | Magnesium | |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Al | Aluminium | |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | Silicon | |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| S | Sulfur | |
| S | ⓘ Marcasite | FeS2 |
| S | ⓘ Troilite | FeS |
| Ca | Calcium | |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Native Iron | Fe |
| Fe | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Marcasite | FeS2 |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Fayalite-Forsterite Series | |
| Ni | Nickel | |
| Ni | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Cu | Copper | |
| Cu | ⓘ Native Copper | Cu |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Great Plains DomainDomain
- Yavapai TerraneVolcanic Arc
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