Meteorite or Meteorwrong?
Rock Analysis for our local community.
With the increase in “reality” shows that follow the searching and discoveries of meteorites by professionals, the Department of Geosciences is receiving at least one inquiry per week regarding findings of meteorites. Note that while our faculty are highly trained in our various fields of geology, including identification of different species of meteorites, it is not our practice to provide analyses or assay service, as it were, for rocks of any type. Please contact an assay office or mining consultant for that service.
We have heard the following statements as evidence that their rocks may be meteorites by those inquiring:
- “it’s attractive to magnets”
- “it’s black”
- “it’s heavy”
Many normal terrestrial rocks have these properties, so these lines of evidence do not mean the rocks in question are extraterrestrial in origin. One thing to recognize is that we live in what was, until geologically recently, a volcanically active region, and a great deal of heavy, dense, black/dark, and ferrous (i.e., attractive to magnets) igneous rock was produced and spread out over our region. As lava rocks basalt in the technical term,you can see remnants of this from the hills above Mountain Home to the canyons of the Snake, Bruneau, Owyhee, Malheur, and Payette rivers. Odds are great that the rock you are interested in learning about is sourced from such a deposit.
That does not detract from your find, or interest in the natural world. However, in order to prevent a meteorite shower of samples arriving in our offices and lots of time spent on the phone, we have two options for submission of your sample for review.
One: Take several good quality photos using some standard item for scale (such as a quarter or ruler). Take the photos up close, if possible, and from different perspectives or angles. Submit via our online form at https://www.boisestate.edu/earth/meteorite-or-meteorwrong/.
Two: Bring your sample to our offices, but leave them at the front desk with your contact information (email) and information about where you found them or other historical information. We will work to get you an answer within two weeks, after which time you will have one week to pick up your sample. After that period, we will add it to our rock garden.
If you have more questions regarding your sample, or questions regarding proper identification of a meteorite, please check out this page at Arizona State University http://meteorites.asu.edu/faq. ASU has a highly regarded planetary geology program, and has faculty with research interests in that area.
Also, Washington University of St. Louis also has a page with photos and explanations of why the many rocks submitted to them (many look just like the ones we receive) are meteowrongs.
There is a nice display of meteorites at the Idaho Museum Mineral & Geology, at the the old penitentiary in Boise. Visit the site here for more information.
Thank you for your interest!