Shield Oriented H-chondrite with Flow Lines - 53 g
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Selected by Francesco Moser
Over 20 years collecting meteorites; former museum curator and experienced restorer.
Estimate € 220 - € 250
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Shield-shaped oriented meteorite, likely an H-chondrite, 53 g, from Northwest Africa – Sahara Desert, with two certificates of authenticity and a transparent flow frame plus specimen ID card.
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Description from the seller
A 53 gram oriented, shield-shaped individual of an unclassified likely H-chondrite, preserving a well-developed fusion crust and several characteristic atmospheric-entry features.
The specimen exhibits clearly defined flow lines across its fusion crust, recording the movement of molten material over the surface during atmospheric ablation. A small roll-over lip is also present along the trailing edge, providing further evidence of the stone's orientation during atmospheric flight.
The shield-like morphology is particularly characteristic of an oriented meteorite: the relatively broad leading face experienced sustained ablation while the surrounding material was progressively sculpted by the high-temperature flow of the atmosphere.
The specimen is unclassified, but its mineralogical and physical characteristics are consistent with an H-group ordinary chondrite. H chondrites are characterised by relatively high total iron compared with L and LL chondrites, with much of the iron occurring as Fe-Ni metal and sulfide.
As this specimen has not undergone formal classification, the H-chondrite designation should be regarded as likely (based on its strong magnetic response).
The exterior preserves several features that are of particular interest in an oriented meteorite:
Flow lines produced by the movement of molten surface material during ablation
Shield-like oriented morphology
A distinct roll-over lip along part of the trailing edge
The roll-over lip is especially useful for establishing the specimen's orientation. During atmospheric entry, the high-temperature boundary layer causes progressive melting and displacement of material from the leading surface towards the sides and trailing regions of the stone, where it can accumulate as a raised lip.
I am a member of the Meteoritical Society (#7743) and the Global Meteorite Association (#G0129) and have been collecting meteorites for over 16 years.
A 53 gram oriented, shield-shaped individual of an unclassified likely H-chondrite, preserving a well-developed fusion crust and several characteristic atmospheric-entry features.
The specimen exhibits clearly defined flow lines across its fusion crust, recording the movement of molten material over the surface during atmospheric ablation. A small roll-over lip is also present along the trailing edge, providing further evidence of the stone's orientation during atmospheric flight.
The shield-like morphology is particularly characteristic of an oriented meteorite: the relatively broad leading face experienced sustained ablation while the surrounding material was progressively sculpted by the high-temperature flow of the atmosphere.
The specimen is unclassified, but its mineralogical and physical characteristics are consistent with an H-group ordinary chondrite. H chondrites are characterised by relatively high total iron compared with L and LL chondrites, with much of the iron occurring as Fe-Ni metal and sulfide.
As this specimen has not undergone formal classification, the H-chondrite designation should be regarded as likely (based on its strong magnetic response).
The exterior preserves several features that are of particular interest in an oriented meteorite:
Flow lines produced by the movement of molten surface material during ablation
Shield-like oriented morphology
A distinct roll-over lip along part of the trailing edge
The roll-over lip is especially useful for establishing the specimen's orientation. During atmospheric entry, the high-temperature boundary layer causes progressive melting and displacement of material from the leading surface towards the sides and trailing regions of the stone, where it can accumulate as a raised lip.
I am a member of the Meteoritical Society (#7743) and the Global Meteorite Association (#G0129) and have been collecting meteorites for over 16 years.
Details
Type of meteorite
Shield Oriented H-chondrite with Flow Lines
Supplement
2 certificates of authenticity, transparent flow frame + specimen ID card
Weight
53 g
Country of origin
Northwest Africa - Sahara Desert
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