Acapulcoite
Acapulcoite | |
---|---|
— Group — | |
Type | Achondrite |
Structural classification | ? |
Class | Primitive achondrite |
Subgroups |
|
Parent body | Unknown |
Composition | Olivine, orthopyroxene, plagioclase, meteoric iron, troilite |
Total known specimens | Fifty two |
Alternative names | Acapulcoites, Acapulcoite group, Acapulcoite meteorites |
Acapulcoites are a group of the primitive achondrite class of stony meteorites.
Naming and history
The acapulcoites are named after the only specimen of the group, with a witnessed fall. The Acapulca meteorite fell on 11 August 1976 at 11:00 near El Quemado Colony (16°52′59″N 99°54′00″W / 16.883°N 99.9°W), outside Acapulco, Guerrero, Mexico. It had a mass of 1,914 grams (67.5 oz). The stone was retrieved 15 minutes afterwards from a 30 centimetres (12 in) deep crater and was cool to the touch.[1] Following that discovery 52 meteorite specimens have been classified as acapulcoites.[2]
Chemical composition
Acapulcoites are primarily composed of olivine, orthopyroxene, plagioclase, meteoric iron, and troilite.
Like all primitive achondrites, acapulcoites have chemical composition and mineralogical similarities with chondrites,[3] some specimen even show relic chondrules. Their mineral composition lies between H and E chondrites.[3]
See also
References
- ↑ "Acapulco". Meteoritical Bulletin Database. Retrieved 10 December 2012.
- ↑ "Meteoritical Bulletin Database". Meteoritical Bulletin. Retrieved 10 December 2012.
- 1 2 "PAC Group - Primitive Achondrites". Meteorite.fr. Retrieved 10 December 2012.