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Gilgoin meteorite, Brewarrina, Clyde Co., New South Wales, Australiai
| Regional Level Types | |
|---|---|
| Gilgoin meteorite | Meteorite Fall Location |
| Brewarrina | - not defined - |
| Clyde Co. | County |
| New South Wales | State |
| Australia | Country |
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Latitude & Longitude (WGS84):
30° 22' 59'' South , 147° 12' 0'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Carinda | 195 (2013) | 47.2km |
| Brewarrina | 1,185 (2012) | 57.2km |
Ordinary Chondrite (H5; S4)
Find,1889; 147 kg
Seven meteoritic stones were found over an area of ~10 sq. km (the largest 30.6 kg). An additional 11.9 kg was found in 1920. Olivine and low-Ca pyroxene compositions (Fa18, Fs16) are characteristic of H (high iron) class ordinary chondrites. The meteorite has experienced strong shock exhibited, particularly, with pervasive small parallel fractures and some unusual inclusions. Mosaicism in both olivine and pyroxene are characteristic of S4 level shock. A cosmic ray exposure age of 6.1 Ma has been reported.
The majority of the mass [75 kg] has been held at the Australian Museum in Sydney [as of 2000]. A 13 kg mass has been at Arizona State University in Tempe for several decades with several other moderate-sized masses distributed elsewhere.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
7 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' Description: Olivine (Fa18) and Ca-poor pyroxene (Fs16) typical of H chondrites (Mason, 1974). References: |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ 'Maskelynite' Description: Plagioclase normative glass indicates that all or most of the glass is maskelynite. |
| ⓘ Native Copper Formula: Cu |
| ⓘ Native Iron Formula: Fe |
| ⓘ Native Iron var. Kamacite Formula: (Fe,Ni) |
| ⓘ 'Orthopyroxene Subgroup' Description: Very early classification as 'Olivine-bronzite chondrite' and conspicuous granulation indicate conversion of (most) pyroxene to orthopyroxene. |
| ⓘ 'Plessite' |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 Description: Pyroxene is presumptively mostly Ca-poor orthopyroxene (bronzite), but shocked grains of Ca-poor clinopyroxene quite possible. |
| ⓘ Taenite Formula: (Fe,Ni) |
| ⓘ Tetrataenite Formula: FeNi |
| ⓘ Troilite Formula: FeS References: |
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) |
| ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
| ⓘ | Tetrataenite | 1.AE.10 | FeNi |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Troilite | 2.CC.10 | FeS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| Unclassified | |||
| ⓘ | 'Maskelynite' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Plessite' | - | |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| Mg | Magnesium | |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Si | Silicon | |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| S | Sulfur | |
| S | ⓘ Troilite | FeS |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Native Iron | Fe |
| Fe | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Fe | ⓘ Taenite | (Fe,Ni) |
| Fe | ⓘ Tetrataenite | FeNi |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Fayalite-Forsterite Series | |
| Ni | Nickel | |
| Ni | ⓘ Native Iron var. Kamacite | (Fe,Ni) |
| Ni | ⓘ Taenite | (Fe,Ni) |
| Ni | ⓘ Tetrataenite | FeNi |
| Cu | Copper | |
| Cu | ⓘ Native Copper | Cu |
Other Regions, Features and Areas containing this locality
Australia
- Lachlan OrogenOrogen
- Central NSW - Omeo ProvinceGeologic Province
- Surat BasinBasin
Australian PlateTectonic Plate
- North Delamerian OrogenOrogenic Belt
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References
www.encyclopedia-of-meteorites.com (n.d.) http://www.encyclopedia-of-meteorites.com/test/Gilgoin_don_edwards.JPG
astromaterials.ca (n.d.) http://astromaterials.ca/wp-content/uploads/2013/12/9_Flemming_In-situ-X-ray-diffraction-in-Meteoritics.pdf
Mason, Brian (1963) Olivine composition in chondrites. Geochimica et Cosmochimica Acta, 27 (10) 1011-1023 doi:10.1016/0016-7037(63)90062-0