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Sete Lagoas meteorite, Sete Lagoas, Minas Gerais, Brazili
Regional Level Types
Sete Lagoas meteoriteMeteorite Fall Location
Sete LagoasCity
Minas GeraisState
BrazilCountry

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Key
Latitude & Longitude (WGS84):
19° 28' South , 44° 13' West
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Sete Lagoas201,334 (2012)3.1km
Matozinhos30,843 (2012)17.4km
Pedro Leopoldo49,261 (2012)24.8km
Esmeraldas103,206 (2012)34.4km
Ribeirão das Neves406,802 (2012)36.0km


Ordinary chondrite, black (H4; S3)
Fall, 15 December 1908; 350 g

Detonations were followed by the immediate recovery of 4 small rounded stones. Over time a total of at 14 stones, usually with complete or nearly complete fusion crusts, were recovered. Inspection reveal distinct chondrules with various textures (apparent size range of 0.1-2.0 mm). The chondrules and chondrule fragments are embedded in a fine-grained and sometimes glassy matrix. The stones are compositionally dominated by variable olivine and pyroxene, accompanied by Fe-Ni metal (kamacite and taenite). Subordinate amounts of troilite and albitic plagioclase ('oligoclase') are present. The mean compositions of the [nearly equilibrated] olivine (Fa~19) and low Ca-pyroxene (Fs17.1) compositions are characteristic of the H-chondrite geochemical group. The incomplete equilibration and the residual glass within chondrules are consistent with its H4 petrologic type designation. Indicators of moderate shock (S3 is the most common shock stage for meteorites) include planar fractures and the 'blackened' texture color resulting from tiny grains of dispersed Fe-Ni metal and sulfide. Limonite rims are found around Fe-Ni grains of some specimens.

A cosmic ray exposure age of 4.9 Ma has been measured, but the isotopic profiles are somewhat disturbed as the preterrestrial meteoroid has apparently experienced more than one significant impact during its relatively recent history as a very small body before its eventual earth impact.

The H (relatively high in total iron) chondrites are the second largest group of ordinary chondrites and represent ~40% of classified witnessed falls. H4 chondrites represent less than 20 % of the H chondrites. Sete Lagoas is the least massive of the five witnessed H4 Brazilian falls and is only 44 on the list of 51 meteorite falls classified exactly as H4 chondrites at the end of May 2016.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Albite-Anorthite Series'
Description: Plagioclase composition [An12.2Ab82.1Or5.7], Gomes & Keil (1980).
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Chromite
Formula: Fe2+Cr3+2O4
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
'Fayalite-Forsterite Series'
Description: Olivine Composition — Fa19.4 [Gomes&Keil,1978], Fa19 [Mason, 1963].
Reference: Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).; Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
'Glass'
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Iron
Formula: Fe
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: Hydrous Fe-oxides around metal rims (weatherate).
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Merrillite
Formula: Ca9NaMg(PO4)7
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
'Orthopyroxene Subgroup'
Description: 'Bronzite' (Fs17.1)
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. 162 pages.
Taenite
Formula: (Fe,Ni)
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Troilite
Formula: FeS
Reference: Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Group 8 - Phosphates, Arsenates and Vanadates
Merrillite8.AC.45Ca9NaMg(PO4)7
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Glass'-
'Limonite'-(Fe,O,OH,H2O)
'Orthopyroxene Subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)3(XO4)2
Merrillite38.3.4.4Ca9NaMg(PO4)7
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Glass'-
Iron-Fe
'Limonite'-(Fe,O,OH,H2O)
'Orthopyroxene Subgroup'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O ChromiteFe2+Cr23+O4
O Limonite(Fe,O,OH,H2O)
O MerrilliteCa9NaMg(PO4)7
NaSodium
Na MerrilliteCa9NaMg(PO4)7
MgMagnesium
Mg MerrilliteCa9NaMg(PO4)7
PPhosphorus
P MerrilliteCa9NaMg(PO4)7
SSulfur
S TroiliteFeS
CaCalcium
Ca MerrilliteCa9NaMg(PO4)7
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Limonite(Fe,O,OH,H2O)
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
Fe IronFe
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Taenite(Fe,Ni)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).
Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Graf, T. & Marti, K. (1995) Collisional History of H Chondrites: Journal of Geophysical Research 100 (E10): 247-263. (Oct 1995).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

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