Pinnaroo meteorite, Pinnaroo, Murray Mallee, Murray Basin, South Australia, Australiai
Regional Level Types | |
---|---|
Pinnaroo meteorite | Meteorite Fall Location |
Pinnaroo | - not defined - |
Murray Mallee | - not defined - |
Murray Basin | Basin |
South Australia | State |
Australia | Country |
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Latitude & Longitude (WGS84):
35° 22' 60'' South , 140° 55' 0'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Pinnaroo | 587 (2013) | 13.5km |
Parilla | 319 (2012) | 24.5km |
Murrayville | 444 (2012) | 27.7km |
Lameroo | 885 (2013) | 36.8km |
Karte | 104 (2011) | 40.3km |
Mindat Locality ID:
264840
Long-form identifier:
mindat:1:2:264840:1
GUID (UUID V4):
f0ef32f6-b776-4767-b388-72cc7a364458
Stony-iron, Mesosiderite-A4
Find, 1927; 39.4 kg, a single mass
An unusual, rather large and roughly ellipsoidal mass (~37x29x17 cm) was plowed up 15 km from Pinnaroo. It was brought to the University of Adelaide for identification where it was sectioned into 3 pieces. The initial assay — silicates (51 vol%), metal (44 vol%), and troilite (4.5 vol%) — revealed a severely weathered stony-iron meteorite with some unusual features. Both the metal and silicates are found in the usually fine-grained matrix and as larger irregular grains and crystals. Masswise, of course, the Fe-Ni metal (Ni 7%) constitutes most of the meteorites mass (~60 wt%). The metal, mostly Kamacite, display a Widmanstätten pattern with prominent kamacite bands accompanied by narrow taenite ribbons in larger metallic nodules and is also present as very fine kamacite-taenite intergrowths within the matrix. The silicates are predominantly orthopyroxene (50%) and anorthitic plagioclase (~40%), but some of the larger olivine crystals draw immediate attention. Troilite (~10 wt%) is also prominent. All major components — Fe-Ni metal, silicates, and troilite — occur as clasts as well as matrix. Minor and trace constituents include additional silicates (augite, pigeonite, tridymite), phosphates, and several opaques. The troilite, often simultaneously contingent to both silicates and metal, is one of numerous signs that the Pinnaroo mass has been shock-melted. All mesosiderites are breccias of one sort or another, but of the ~40 fully classified mesosiderites only 7 have been characterized as petrologic type 4 (shock-melted).
Some caution is required in interpreting modal and volume analyses. Lawrencite and pentlandite in iron-rich meteorites are common products of terrestrial weathering and Pinnaroo is severely weathered on both the outside and in some interior regions. In this context, the observations of fragile oldhamite and daubréelite are mildly surprising, but not totally unexpected as weathering may be unusually irregular in brecciated meteorites.
Pinnaroo is classified as an Mesosiderites-A4 (high in plagioclase). Among the ~ 40 fully classified mesosiderites, Pinnaroo is the most massive of the 4 meteorites classified as mesosiderite-A4. Most of the mass (~25 kg) is with the University of Adelaide with less than 2 kg distributed among other scientific parties as of 2000.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
21 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:
ⓘ Anorthite Formula: Ca(Al2Si2O8) Description: Plagioclase in matrix & clasts is usually anorthite (An91-97)[Floran et al. (1978)]. References: |
ⓘ 'Apatite' Formula: Ca5(PO4)3(Cl/F/OH) |
ⓘ Augite Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ Chromite Formula: Fe2+Cr3+2O4 References: |
ⓘ 'Clinopyroxene Subgroup' References: |
ⓘ Copper Formula: Cu |
ⓘ Daubréelite Formula: Fe2+Cr3+2S4 |
ⓘ 'Fayalite-Forsterite Series' Description: Fo84-88 according to Delaney et al. (1980). References: |
ⓘ Ilmenite Formula: Fe2+TiO3 References: |
ⓘ Iron Formula: Fe References: |
ⓘ Iron var. Kamacite Formula: (Fe,Ni) References: |
ⓘ Isocubanite Formula: CuFe2S3 |
ⓘ Lawrencite Formula: (Fe2+,Ni)Cl2 Description: After some initial missteps, acetone washing was used to quell further deterioration. |
ⓘ Mackinawite Formula: FeS |
ⓘ Merrillite Formula: Ca9NaMg(PO4)7 |
ⓘ Oldhamite Formula: (Ca,Mg)S |
ⓘ 'Orthopyroxene Subgroup' References: |
ⓘ Pentlandite Formula: (NixFey)Σ9S8 Description: Pentlandite in weathered irons and stony-irons is usually a product of weathering. |
ⓘ Pigeonite Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 Description: Plagioclase in matrix & clasts is usually anorthite (An91-97)[Floran et al. (1978)]. However, normative analysis suggests that matrix plagioclase is more albitic than the larger lithic fragments. References: |
ⓘ 'Plessite' |
ⓘ Rutile Formula: TiO2 |
ⓘ Schreibersite Formula: (Fe,Ni)3P |
ⓘ Sphalerite Formula: ZnS References: |
ⓘ Taenite Formula: (Fe,Ni) References: |
ⓘ Tetrataenite Formula: FeNi |
ⓘ Tridymite Formula: SiO2 References: |
ⓘ Troilite Formula: FeS References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Copper | 1.AA.05 | Cu |
ⓘ | Iron | 1.AE.05 | Fe |
ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
ⓘ | Tetrataenite | 1.AE.10 | FeNi |
ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
ⓘ | Schreibersite | 1.BD.05 | (Fe,Ni)3P |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Pentlandite | 2.BB.15 | (NixFey)Σ9S8 |
ⓘ | Sphalerite | 2.CB.05a | ZnS |
ⓘ | Isocubanite | 2.CB.55b | CuFe2S3 |
ⓘ | Troilite | 2.CC.10 | FeS |
ⓘ | Mackinawite | 2.CC.25 | FeS |
ⓘ | Oldhamite | 2.CD.10 | (Ca,Mg)S |
ⓘ | Daubréelite | 2.DA.05 | Fe2+Cr3+2S4 |
Group 3 - Halides | |||
ⓘ | Lawrencite | 3.AB.20 | (Fe2+,Ni)Cl2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
ⓘ | Tridymite | 4.DA.10 | SiO2 |
ⓘ | Rutile | 4.DB.05 | TiO2 |
Group 8 - Phosphates, Arsenates and Vanadates | |||
ⓘ | Merrillite | 8.AC.45 | Ca9NaMg(PO4)7 |
Group 9 - Silicates | |||
ⓘ | Pigeonite | 9.DA.10 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ | Anorthite | 9.FA.35 | Ca(Al2Si2O8) |
Unclassified | |||
ⓘ | 'Clinopyroxene Subgroup' | - | |
ⓘ | 'Fayalite-Forsterite Series' | - | |
ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
ⓘ | 'Plessite' | - | |
ⓘ | 'Orthopyroxene Subgroup' | - | |
ⓘ | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
O | Oxygen | |
O | ⓘ Anorthite | Ca(Al2Si2O8) |
O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
O | ⓘ Chromite | Fe2+Cr23+O4 |
O | ⓘ Ilmenite | Fe2+TiO3 |
O | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
O | ⓘ Rutile | TiO2 |
O | ⓘ Tridymite | SiO2 |
O | ⓘ Merrillite | Ca9NaMg(PO4)7 |
O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
O | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
F | Fluorine | |
F | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
Na | Sodium | |
Na | ⓘ Merrillite | Ca9NaMg(PO4)7 |
Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Mg | Magnesium | |
Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Mg | ⓘ Oldhamite | (Ca,Mg)S |
Mg | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Mg | ⓘ Merrillite | Ca9NaMg(PO4)7 |
Al | Aluminium | |
Al | ⓘ Anorthite | Ca(Al2Si2O8) |
Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Si | Silicon | |
Si | ⓘ Anorthite | Ca(Al2Si2O8) |
Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Si | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Si | ⓘ Tridymite | SiO2 |
Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
P | Phosphorus | |
P | ⓘ Schreibersite | (Fe,Ni)3P |
P | ⓘ Merrillite | Ca9NaMg(PO4)7 |
P | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
S | Sulfur | |
S | ⓘ Daubréelite | Fe2+Cr23+S4 |
S | ⓘ Isocubanite | CuFe2S3 |
S | ⓘ Mackinawite | FeS |
S | ⓘ Oldhamite | (Ca,Mg)S |
S | ⓘ Pentlandite | (NixFey)Σ9S8 |
S | ⓘ Sphalerite | ZnS |
S | ⓘ Troilite | FeS |
Cl | Chlorine | |
Cl | ⓘ Lawrencite | (Fe2+,Ni)Cl2 |
Cl | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
Ca | Calcium | |
Ca | ⓘ Anorthite | Ca(Al2Si2O8) |
Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Ca | ⓘ Oldhamite | (Ca,Mg)S |
Ca | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Ca | ⓘ Merrillite | Ca9NaMg(PO4)7 |
Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Ca | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
Ti | Titanium | |
Ti | ⓘ Ilmenite | Fe2+TiO3 |
Ti | ⓘ Rutile | TiO2 |
Cr | Chromium | |
Cr | ⓘ Chromite | Fe2+Cr23+O4 |
Cr | ⓘ Daubréelite | Fe2+Cr23+S4 |
Fe | Iron | |
Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | ⓘ Daubréelite | Fe2+Cr23+S4 |
Fe | ⓘ Ilmenite | Fe2+TiO3 |
Fe | ⓘ Iron | Fe |
Fe | ⓘ Isocubanite | CuFe2S3 |
Fe | ⓘ Iron var. Kamacite | (Fe,Ni) |
Fe | ⓘ Lawrencite | (Fe2+,Ni)Cl2 |
Fe | ⓘ Mackinawite | FeS |
Fe | ⓘ Pentlandite | (NixFey)Σ9S8 |
Fe | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fe | ⓘ Schreibersite | (Fe,Ni)3P |
Fe | ⓘ Taenite | (Fe,Ni) |
Fe | ⓘ Tetrataenite | FeNi |
Fe | ⓘ Troilite | FeS |
Ni | Nickel | |
Ni | ⓘ Iron var. Kamacite | (Fe,Ni) |
Ni | ⓘ Lawrencite | (Fe2+,Ni)Cl2 |
Ni | ⓘ Pentlandite | (NixFey)Σ9S8 |
Ni | ⓘ Schreibersite | (Fe,Ni)3P |
Ni | ⓘ Taenite | (Fe,Ni) |
Ni | ⓘ Tetrataenite | FeNi |
Cu | Copper | |
Cu | ⓘ Copper | Cu |
Cu | ⓘ Isocubanite | CuFe2S3 |
Zn | Zinc | |
Zn | ⓘ Sphalerite | ZnS |
Other Regions, Features and Areas containing this locality
Australia
- Adelaide SuperbasinBasin
- Delamerian OrogenOrogen
- Murray BasinBasin
Australian PlateTectonic Plate
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