Peramiho meteorite, Nguni, Songea Urban District, Ruvuma Region, Tanzania i
Regional Level Types
Peramiho meteorite Meteorite Fall Location
Nguni - not defined -
Songea Urban District District
Ruvuma Region Region
Tanzania Country

Classification: Eucrite, monomict
Fall, 24 October 1899; 165 grams

After a fireball and loud booms in the early morning, a small stone was found. While the moderately brecciated Peramiho had travelled a long way before reaching the earth, its classification as a monomict eucrite indicates that its relatively homogeneous clasts and aggregates were almost entirely derived from nearby lithological units of its original parent body. Peramiho's primary constituents are pyroxene (mostly inverted pigeonite with exolved augite) and plagioclase (bytownite) eucrites. Not unsurprisingly, as a small rock it has not received a great deal of attention in recent decades, but is has sometimes been described as anomalous because of its relatively Mg-rich silicate mineralogy.

Current planetary science is busy trying to integrate our knowledge of HED (howardite-eucrite-diogenite) meteorites, asteroidal spectra and orbits, and the Dawn mission to Vesta into a coherent picture of asteroidal history and meteorites delivery. Peramiho is a very small piece of this enormous puzzle. For now, however, it appears that Peramiho is one of those meteorites whose components were aggregated ~4.5 billion years ago close to the surface of Vesta, before chance, circumstance, and impacts eventually brought it to the continent of Africa and the attention of humans.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

9 valid minerals.

Meteorite/Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

ⓘ 'Eucrite monomict breccia meteorite'

Detailed Mineral List:

ⓘ Anorthite

Formula: Ca(Al₂Si₂O₈)

Description: Relatively homogeneous Plagioclase (Ab85; An84-87) of Bytownite compostion

References:

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics 32 (2): 271-280. (March 1997)

ⓘ Anorthite var. Bytownite

Formula: (Ca,Na)[Al(Al,Si)Si₂O₈]

Description: Relatively homogeneous Plagioclase (Ab85; An84-87) of Bytownite compostion

References:

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics 32 (2): 271-280. (March 1997)

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

Description: Apatite contains both Fl & Cl; Hsu & Crozaz (1997)

References:

Hsu, W. & Crozaz, G. (1996) Pomozdino and Peramiho: Are They Anomalous Eucrites? Lunar and Planetary Science XXVII: 567-568.

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics 32 (2): 271-280. (March 1997)

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

Bertwerth, F. (1912) Quartz und Tridymite als Gemengteile der meteorischen Eukrite. Ber. Akad. Wiss. Wien, math.-net. Kl., Abt: pp. 763-785. (1912)

Hsu, W. & Crozaz, G. (1996) Pomozdino and Peramiho: Are They Anomalous Eucrites? Lunar and Planetary Science XXVII: 567-568.

ⓘ Chromite

Formula: Fe²⁺Cr³⁺₂O₄

References:

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics 32 (2): 271-280. (March 1997)

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics 32 (2): 271-280. (March 1997)

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Bertwerth, F. (1912) Quartz und Tridymite als Gemengteile der meteorischen Eukrite. Ber. Akad. Wiss. Wien, math.-net. Kl., Abt: pp. 763-785. (1912)

ⓘ Merrillite

Formula: Ca₉NaMg(PO₄)₇

References:

Hsu, W. & Crozaz, G. (1996) Pomozdino and Peramiho: Are They Anomalous Eucrites? Lunar and Planetary Science XXVII: 567-568.

ⓘ 'Orthopyroxene Subgroup'

References:

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics & Planetary Science 32 (2):271-280. (March 1997)

ⓘ Pigeonite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

Mason, Brian (1967) The Bununu meteorite, and a discussion of the pyroxene-plagioclase achondrites. Geochimica et Cosmochimica Acta, 31 (2) 107-115 doi:10.1016/s0016-7037(67)80040-1

Hsu, W. & Crozaz, G. (1996) Pomozdino and Peramiho: Are They Anomalous Eucrites? Lunar and Planetary Science XXVII: 567-568.

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

Description: Plagioclase — (Ab9-14, ave11) according to Mason et al., (1979); An 84-87 according to Hsu & Crozaz (1996)

References:

Mason B., Jarosewich E. & Nelen J. A. (1979) The pyroxene-plagioclase achondrites. Smithson. Contrib. Earth Sci. 22: 27-45.

Hsu, W. & Crozaz, G. (1996) Pomozdino and Peramiho: Are They Anomalous Eucrites? Lunar and Planetary Science XXVII: 567-568.

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics & Planetary Science 32 (2):271-280. (March 1997)

ⓘ 'Pyroxene Group'

Formula: ADSi₂O₆

Description: Both Ca-poor & Ca-rich

References:

Mason B., Jarosewich E. & Nelen J. A. (1979) The pyroxene-plagioclase achondrites. Smithson. Contrib. Earth Sci. 22: 27-45.

ⓘ Quartz

Formula: SiO₂

Description: Quartz is associated with plagioclase-augite intergrowths

References:

Bertwerth, F. (1912) Quartz und Tridymite als Gemengteile der meteorischen Eukrite. Ber. Akad. Wiss. Wien, math.-net. Kl., Abt: pp. 763-785. (1912)

ⓘ Troilite

Formula: FeS

References:

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics 32 (2): 271-280. (March 1997)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Troilite	2.CC.10	FeS
Group 4 - Oxides and Hydroxides
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Quartz	4.DA.05	SiO₂
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Merrillite	8.AC.45	Ca₉NaMg(PO₄)₇
Group 9 - Silicates
ⓘ	Pigeonite	9.DA.10	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Anorthite	9.FA.35	Ca(Al₂Si₂O₈)
ⓘ	var. Bytownite	9.FA.35	(Ca,Na)[Al(Al,Si)Si₂O₈]
Unclassified
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'Pyroxene Group'	-	ADSi₂O₆
ⓘ	'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	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Quartz	SiO₂
O	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Pyroxene Group	ADSi₂O₆
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	Fluorine
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Na	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Al	Aluminium
Al	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Al	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Si	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Quartz	SiO₂
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Pyroxene Group	ADSi₂O₆
P	Phosphorus
P	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Troilite	FeS
Cl	Chlorine
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	Calcium
Ca	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Ca	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)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
Cr	Chromium
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Troilite	FeS

Other Regions, Features and Areas containing this locality

AfricaContinent

East African Rift System (EARS)Zone (Tectonic)

African Plate

Congo Craton
- Ubendian BeltShield
Tanzanian Coastal basinBasin

Somali PlateTectonic Plate

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References

www.landesmuseum.at (n.d.) http://www.landesmuseum.at/pdf_frei_remote/SBAWW_121_0763-0783.pdf

Bertwerth, F. (1912) Quartz und Tridymite als Gemengteile der meteorischen Eukrite. Ber. Akad. Wiss. Wien, math.-net. Kl., Abt: pp. 763-785. (1912)

Mason, Brian (1967) The Bununu meteorite, and a discussion of the pyroxene-plagioclase achondrites. Geochimica et Cosmochimica Acta, 31 (2) 107-115 doi:10.1016/s0016-7037(67)80040-1

Mason B., Jarosewich E. & Nelen J. A. (1979) The pyroxene-plagioclase achondrites. Smithson. Contrib. Earth Sci. 22: 27-45.

Hsu, W. & Crozaz, G. (1996) Pomozdino and Peramiho: Are They Anomalous Eucrites? Lunar and Planetary Science XXVII: 567-568.

Hsu, W. & Crozaz, G. (1997) Ion microprobe study of the pomozdino and peramiho eucrites: Meteoritics & Planetary Science 32 (2):271-280. (March 1997)

Grady, Monica (2000) Catalogue of Meteorites (5th ed.). Cambridge University Press.

www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php

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