ABOUT AUTOR: I am a traveler, hunter and collector, iron and stone-iron meteorites. My fields of research are planetary geology, impact structures, Earth and solar system development. I am a member of the International Society for Meteorics and Planetary Science, the IMCA encyclopedia of Meteorites and MetBase. My name is Michal Tomeček and I come from the Czech Republic. My main activity is searching for forgotten or very old iron meteorites and research impact structures.

BASIC TERMINOLOGY

What is a meteorite?

The meteorite is generally understood as a natural extraterrestrial body that hit the Earth's surface, it survived the passage through the atmosphere. This body may be either an asteroid, meteoroid or comet. The difference between asteroids and meteoroids is in their size and by the asteroid in the atmosphere does not lose its original speed or mass, struck the earth creates an impact crater, while a meteoroid that is in the earth's atmosphere is changing, meteor * may be in the atmosphere to evaporate all or most its initial mass and its original speed is sufficiently slowed by friction with air molecules, so that in the final phase of flight atmosphere free fall. Upon landing on Earth we call it a meteorite.

* Meteor: It is a term denoting lighting effect linked to the entry and movement of meteoroid in the atmosphere. If a meteor brighter than the glow of the brightest planets is called a fireball.

Names of meteorites.

They are derived from the place or region of their first award.

NWA meteorites.

They are generally taken into account all meteorites found in North-West-Africa.

Image: nasa.gov

CLASSIFICATION of meteorites

 

 

IRON METEORITES - IAB, IIAB, IIIAB, IVAB, UNGROUPED, OTHER.

IAB COMPLEX THE MAIN GROUP.

  • MG - iron meteorite: A meteorite that is dominantly composed of Fe-Ni metal and that crystallized from a melt.
  • Complex - An iron meteorite belonging to the IAB complex that has not been classified into a subgroup. IAB complex: An association of iron meteorites, including the former groups IAB and IIICD.
  • SLM - An iron meteorite belonging to the low-Au, medium-Ni subgroup (sLM) of the IAB complex.
  • Ung - iron meteorite belonging to the IAB complex that has not been classified into a subgroups.
  • SHH - An iron meteorite belonging to the high-Au, high-Ni subgroup (sHH) of the IAB complex.
  • SLH - An iron meteorite belonging to the low-Au, high-Ni subgroup (sLH) of the IAB complex.
  • SLL - An iron meteorite belonging to the low-Au, low-Ni subgroup (sLL) of the IAB complex.
  • SHL - An iron meteorite belonging to the high-Au, low-Ni subgroup (sHL) of the IAB complex.
  • an - An iron meteorite belonging to the IAB complex that has anomalous properties.

 

  •  IIAB irons - An iron meteorite belonging to chemical group IIAB.
  •  IIIAB irons - An iron meteorite belonging to chemical group IIIAB.
  •  IC irons - An iron meteorite belonging to chemical group IC. 
  •  IIC irons - An iron meteorite belonging to chemical group IIC.
  •  IID irons - An iron meteorite belonging to chemical group IID.
  •  IIE irons - An iron meteorite belonging to chemical group IIE.
  •  IIF irons - An iron meteorite belonging to chemical group IIF.
  •  IIG irons - An iron meteorite belonging to chemical group IIG.
  •  IIIE irons - An iron meteorite belonging to chemical group IIIE.
  •  IIIF irons - An iron meteorite belonging to chemical group IIIF.
  •  IVA irons - An iron meteorite belonging to chemical group IVA.
  •  IVB irons - An iron meteorite belonging to chemical group IVB.
  •  an.  with anomalous properties 

 

  • Hexahedrites  ( HEX )                                   Nickel - 4,5% – 6,5%                Texture - Neuman Lines
  • Octahedrites  ( O )                                        Nickel -  6,5% - 17,5%               Texture - Widmanstätten Lines


  • Coarsest octahedrite ( Ogg )                         Nickel – 6,5% - 8,5%      
  • Medium octahedrite ( Om )                         Nickel – 7,4% - 10,3%
  • Fine, Finest octahedrite (Of, Off )               Nickel – 7,8% - 17%
  • Plessitic (Opl )                                             Kamacite spindles

 

  • Ataxite (D )                                                 Nickel -  >16% ( High Nickel content )    Texture - none

 

STONY – IRON METEORITES

Pallasites

Mesosiderites

CHONDRITES

CARBONACEOUS chondrite

  • CI  type Ivuna
  • CM  type Mighei
  • CO  type Ornans
  • CV  type Vigarano - CVₒₓᴀ  type Allende - CVₒₓᴃ type Bali - CVᴿᴱᴰ reduced
  • CK  type Karoonda
  • CR  type Renazzo
  • CH  type ALHA 85085 
  • CB  type Bencubbin - CBᴬ - CBᴮ


ORDINARY CHONDRITE

H - L - LL

ENSTATITE 

EH - EL

Rumuruti (R) Kakangari (K) Ungrouped


ACHONDRITES

  • PRIMITIVE - - ACAPULCOITES - WINONAITES - LODRANITES - BRACHINITES - UNGROUPED

  • MARTIAN - - SHERGOTTITES - NAKHLITES - CHASSIGNITES - ALH 84001 OPX

  • AUBRITES

  • UREILITES

  • HED - - EUCRITES - DIOGENITES - HOWARDITES - DUNITE

  • ANGRITES

  • LUNAR - - FELDSPATHIC BRECCIAS - BASALTIC - POLYMICT

METACHONDRITES

CV

CR

En

H

Relict meteorites

relict meteorite: A highly altered object that may have a meteoritic origin. These are dominantly (>95%) composed of secondary minerals formed on the body on which the object was found.

 
 

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