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Al Rais meteorite, Medina Region, Saudi Arabiai
| Regional Level Types | |
|---|---|
| Al Rais meteorite | Meteorite Fall Location |
| Medina Region | Region |
| Saudi Arabia | Country |
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Latitude & Longitude (WGS84):
24° 25' North , 39° 31' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Carbonaceous Chondrite (CR2-an; S1)
Fall, 10 December 1957; 160 g
Al Rais is a small member of the small group of CR (Renazzo-like) Carbonaceous Chondrites . Carbonaceous Chondrite groups are defined and subdivided by their bulk elemental composition and by oxygen isotope ratios. Within this framework, members of the CR chemical group are distinguished by abundant chondrules, fine-grained matrix, and relatively abundant metal. Al Rais is the smallest of the three witnessed CR falls. Indeed, Al Rais is somewhat of an outlier among the group (‘anomalous’). Its chondrule content is somewhat low (>30%), its brecciated matrix has been more hydrated more than other CRs, and it contains more volatiles.
Besides the usual problematics of understanding small and ancient rocks, the CR group and a few related meteorites possess unusually high amounts of Deuterium and Nitrogen-15. These isotopic anomalies and other oddities hint of more poorly understood variations in the ancient Solar Nebula [Cf. Krot et al., (2002) review of the ‘CR Clan’]. Which suggests that for Al Rais to be an oddball among oddballs may just make the science just that more interesting.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
3 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:
| ⓘ 'Chlorite Group' Description: In chondrule cores; rims are often altered |
| ⓘ 'Fayalite-Forsterite Series' Description: Forsteritic, peak abundances at Fa 0-2 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 Description: Mg-rich (similar to Olivine) |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Saponite Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O Description: Mostly accessory to Serpentine |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| Group 9 - Silicates | |||
| ⓘ | Saponite | 9.EC.45 | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Al | Aluminium | |
| Al | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| Si | Silicon | |
| Si | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Ca | Calcium | |
| Ca | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| Fe | Iron | |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Fe | ⓘ Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| Fe | ⓘ Fayalite-Forsterite Series | |
Other Regions, Features and Areas containing this locality
Arabian PeninsulaPeninsula
Arabian PlateTectonic Plate
- Arabian-Nubian ShieldShield
- Al Madinah TerraneVolcanic Arc
AsiaContinent
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