to Do If You Think That Youíve
Iím sorry, but you have not found a meteorite. Yes, your rock is funny-looking and different from other rocks in the area where you found it, but it doesnít have a fusion crust or regmaglypts, so why do you think itís a meteorite at all? Your rock has a rough exterior, unlike the smooth appearance of most stony meteorites. Itís got vesicles (holes, bubbles), which donít occur in meteorites. Your rock is loaded with quartz or calcite, minerals that donít occur in rocks from other bodies in the solar system. The density isnít right for a meteorite. On the basis of my experience with the various meteorwrongs that Iíve examined, you probably have a hematite concretion or some kind of industrial by-product (slag). I have heard many wonderful stories from people who swear that they saw the rock fall, that the rock wasnít in their driveway yesterday, or that it split their tree in two. I canít explain how your rock got to be where you found it, but I can say that it is not a meteorite. [Nearly every rock that someone has described as ďit wasnít there yesterdayĒ was just the right size for throwing. Really.] Not everything that falls from the sky is a meteorite. Or, as one of my correspondents put, most things that fall from the sky are not meteorites.
Even if it is a meteorite, itís not from the Moon or Mars. As I note on my Lunar Meteorites web page, meteorites are rare, lunar meteorites are very rare. Less that 1800 meteorites have been found in the United States in the past 200 years. Less than 1 in 1000 of all known meteorites are from the Moon, and the number is about the same for Mars. No lunar meteorite has yet to be found in the temperate environment of North America or Europe; all were found in deserts of drier continents. Youíve got a better chance of winning big in the lottery than finding a lunar meteorite. You say that your rock attracts a magnet or a compass. Thatís nice. Most (>95%) of meteorites (irons and ordinary chondrites) attract cheap magnets because they contain iron-nickel metal. However, lunar and martian meteorites contain little or no metal, so theyíre not magnetic. (Also, some terrestrial rocks contain magnetite, which is magnetic.) Donít tell me that your rock ďlooks likeĒ one of the photos of a lunar meteorite on my web site. Many kinds of terrestrial rocks ďlook likeĒ lunar meteorites. Finally, I donít want to hear, ďMaybe this is a kind of meteorite nobodyís ever seen before.Ē Get real.
Think of it this
way. If itís driving down the highway and it has 4 tires, 2 headlights, and
a trunk, then itís probably an automobile, not an alien spacecraft.
Look at the photos of meteorites: fusion crust | regmaglypts | more photos. Go through the Self-Test Check-List. Look at this information about meteorite statistics. If youíre still confused, try my Some Meteorite Realities website where many of the same points are stated in a different way.
I urge you to saw your rock in two or cut an "end" off with a tile saw. (Or, bring it to a local rock shop where they are likely to have a rock saw.) Most stony meteorites are ordinary chondrites. Metal grains are easily visible on the sawn face of an ordinary chondrite.
If you contact me, please use e-mail. Do not call me on the telephone and donít send a letter. I do not answer or respond to telephone calls about meteorites. Why? I canít identify meteorites over the telephone. (Nobody can.) Also, I donít hear well and often donít understand people who call me on the phone. If you send a letter, I probably wonít answer it because it takes too much time. So, e-mail me. Please include a few good digital photos with your e-mail. If the photos are not in focus, they are of no use to me. Include some object like a hand, coin, or ruler in the photographs for scale.
New policy: I am likely not to respond to the following types of e-mail.
∑ Your e-mail has little or nothing to do with meteorite identification
∑ You didnít ask me a question
∑ I donít know the answer to your question
∑ You want me to buy rocks you think are meteorites
∑ No photos were attached
∑ Photos several rocks were attached (What? You think you found more than one meteorite?)
∑ You send me a video. I wonít watch it. I just want sharp, well illuminated photos
∑ The object in photo is clearly not a meteorite to anyone who has studied the info provided above
∑ You donít tell me your real name
∑ Youíve contacted me several times before and Iíve told you your rocks donít look like meteorites
∑ Iíve given you my opinion and you argue with me. If you donít like my free opinion, get a second opinion.
If I think the rock in the photos might be a meteorite, then I will respond.
Please do not send me send me samples rocks. I wonít send them back to you. Iím a poor retired university scientist.
If you are particularly certain that your rock is a meteorite and you really want to convince me (or any other scientist), then I urge you to obtain a chemical analysis at a commercial rock-testing laboratory. I recommend Actlabs. Ask for analysis code 4Litho-Meteorite. Please contact me first before sending a sample to Actlabs. I have no financial interest in Actlabs, I just know they do a good job.
Read what they have to say
submittal and sample
preparation. The cost including sample preparation is US$262.50/sample.
Actlabs requests a 5-gram sample (a US nickel weighs 5 grams). However,
they can do the analysis on as little as 1 gram if you request ďno LOIĒ
(loss on ignition, i.e., % weight loss when the sample is heated to a high
temperature). LOI is sometimes useful, but never critical, for determining whether or not a rock is a meteorite.
Check your own data with "Chemical Composition of Meteorites"
If you have found a chunk of metal that you think might be an iron meteorite, you need to have it analyzed (at a minimum) for iron (Fe), nickel (Ni), chromium (Cr), and manganese (Mn). Unfortunately, I do not know a lab that does this cheaply. If somebody out there does, let me know. Find a metallurgical testing laboratory.
October 1, 2018: I have received results of analyses of 477 samples from Actlabs. Only 4 of the rocks have been meteorites. One was an ordinary chondrite found by a soldier in the Sahara desert. Another ordinary chondrite was also from the Sahara and bought by someone who wanted to know if it was ďreal.Ē (I didnít know the circumstances until after heíd sent me the results. I was hoping that heíd found it.) One ordinary chondrite was alleged to have been found in a dry lake bed in California. The fourth had a composition consistent with a pallasite. The report was sent to me from someone in the U.K. in August, 2018. The owner did not claim to have found it. I suspect that it was a purchased piece of the huge Sericho pallasite that fell in Kenya in 2016.† (Iíve been approached by several Kenyans offering to sell me a piece.)†††
So, once again, finding a real meteorite is highly improbable.
If you follow my advice about Actlabs, Iíll make
a serious study of the analytical report and tell you what I think.
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