Enstantite chondrite

The enstatite chondrites are a rare group of meteorites that originated from asteroids formed in the early Solar System, near the Sun. Their unique mineral composition includes the following:
1. Enstatite (MgSiO₃):
Primary mineral: Enstatite, a magnesium-rich silicate, constitutes the bulk of these meteorites.
Feature: This enstatite contains very low iron content, reflecting its formation in an oxygen-deprived environment.
2. Oldhamite (CaS):
Special mineral: A calcium sulfide mineral that is rare on Earth.
Feature: Indicates a strongly reducing formation environment.
3. Troilite (FeS):
Iron sulfide: Common in many meteorites, but in enstatite chondrites, it often coexists with other reducing minerals.
4. Schreibersite (Fe₃P):
Metallic phosphate: A mineral containing iron and phosphorus, frequently found in metallic meteorites and other chondrites.
5. Sinoite (Si₂N₂O):
Exotic mineral: A silicon oxynitride found only in extraterrestrial samples, including meteorites.
6. Niningerite ((Mg, Fe)S):
Sulfide mineral: A mix of magnesium and iron sulfides, unique to enstatite chondrites.
7. Graphite and native metals:
Carbon and metals: Includes free carbon in the form of graphite and sometimes metallic iron-nickel particles.
8. Albit (NaAlSi₃O₈):
Plagioclase mineral: Found in trace amounts, often as remnants or crystalline inclusions in the meteorite matrix.
Subgroups:
Enstatite chondrites are categorized into:
EH chondrites: Enriched in iron, with higher sulfide and metal content.
EL chondrites: Lower iron content, predominantly composed of enstatite.
Scientific Importance:
The mineralogy of enstatite chondrites reveals a formation environment characterized by low oxygen levels, high sulfur content, and reducing conditions. These characteristics offer significant insights into the early Solar System's inner regions and the processes leading to planetary formation
#Enstantitechondrite, #chondrite, #enstantite, #meteorite

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