dsvilko 12 Posted April 17, 2019 Share Posted April 17, 2019 Hi! I am slowly building my micro meteorite collection and have finally manage to find some time to make a few decent macro shots. Anyone interested in trying to guess the meteorite type? The width of most photos is around half and inch or a bit less. 3 1 Quote Link to post Share on other sites
hardtimehermit 526 Posted April 17, 2019 Share Posted April 17, 2019 Iron, lunar, chondrite. nice pictures how did you do that? I want my pictures to look this good. Quote Link to post Share on other sites
Morlock 1,788 Posted April 17, 2019 Share Posted April 17, 2019 The last one looks like a Chelyabinsk. Great photos. 2 Quote Link to post Share on other sites
dsvilko 12 Posted April 17, 2019 Author Share Posted April 17, 2019 But which iron meteorite and what chondrite types? For photos, I've used a reversed 50mm f/2.8 (stopped to ~f/5.6) and a decent bit of extension tubes. This gives me a much flatter field than my usual macro setup with two stacked 50mm lens. At this kinds of magnification the depth of field is minuscule so what you do is take a few photos (or sometimes a few dozen photos) with a slightly different focus point (we are talking about sub 100 micron increments). Later you use a specialized software to merge (or focus-stack as it's called) these multiple photos into a single photo where all of the subject is in focus. These I took handheld but when I have more time I use a custom-built 'robotic' rail capable of automatically taking hundreds of photos with as little as 10 micron jumps between photos. You then get photos like this one, that look almost like they have been taken with SEM: 3 1 Quote Link to post Share on other sites
dsvilko 12 Posted April 17, 2019 Author Share Posted April 17, 2019 29 minutes ago, Morlock said: The last one looks like a Chelyabinsk. Great photos. An excellent guess! Spot on! Quote Link to post Share on other sites
Mikestang 933 Posted April 17, 2019 Share Posted April 17, 2019 My guesses 1. Iron IIAB 2. C chondrite 3. Lunar or Aubrite 4. L4 5. CV3 6. L3 7. already guessed correctly 1 Quote Link to post Share on other sites
dsvilko 12 Posted April 17, 2019 Author Share Posted April 17, 2019 Very well done, Mikestang! Only the L4 is wrong. The chondrules are much too small for the L chondrite. Quote Link to post Share on other sites
Mikestang 933 Posted April 17, 2019 Share Posted April 17, 2019 (edited) I'll change that guess to L5 then? Or maybe you hinted not an L at all, in which case I'll guess R chondrite. Was #3 a lunar or aubrite? If I have to pick, I'll pick aubrite just because. Great photos, and a fun post! Edited April 17, 2019 by Mikestang Quote Link to post Share on other sites
hardtimehermit 526 Posted April 17, 2019 Share Posted April 17, 2019 4 hours ago, dsvilko said: But which iron meteorite and what chondrite types? For photos, I've used a reversed 50mm f/2.8 (stopped to ~f/5.6) and a decent bit of extension tubes. This gives me a much flatter field than my usual macro setup with two stacked 50mm lens. At this kinds of magnification the depth of field is minuscule so what you do is take a few photos (or sometimes a few dozen photos) with a slightly different focus point (we are talking about sub 100 micron increments). Later you use a specialized software to merge (or focus-stack as it's called) these multiple photos into a single photo where all of the subject is in focus. These I took handheld but when I have more time I use a custom-built 'robotic' rail capable of automatically taking hundreds of photos with as little as 10 micron jumps between photos. You then get photos like this one, that look almost like they have been taken with SEM: Oh why did you say so in the first place, that would of been a little harder. Thanks for the photo tips and leave it to our forum expert mstang to nail it! 1 Quote Link to post Share on other sites
dsvilko 12 Posted April 17, 2019 Author Share Posted April 17, 2019 Actually, it's a CO3. They have a much smaller chondrules than any of the ordinary chondrites. Only CH class has smaller. The other one is lunar, a tiny but beautiful nwa 5000 fragment. Here is the back side: 1 Quote Link to post Share on other sites
dsvilko 12 Posted April 27, 2019 Author Share Posted April 27, 2019 This should be an easy one Quote Link to post Share on other sites
DolanDave 706 Posted May 2, 2019 Share Posted May 2, 2019 (edited) eucrite or lunar.. Edited May 2, 2019 by DolanDave Quote Link to post Share on other sites
dsvilko 12 Posted May 2, 2019 Author Share Posted May 2, 2019 Nope Quote Link to post Share on other sites
Bedrock Bob 4,208 Posted May 2, 2019 Share Posted May 2, 2019 On 4/26/2019 at 10:31 PM, dsvilko said: This should be an easy one That is obviously a terrestrilized macrophyte. I learned about these while studying the relationship between testosterone toxicity and cheap vodka on Nuggetshooter. 1 Quote Link to post Share on other sites
Mikestang 933 Posted May 2, 2019 Share Posted May 2, 2019 Diogenite. Quote Link to post Share on other sites
dsvilko 12 Posted May 2, 2019 Author Share Posted May 2, 2019 Not a diogenite. Here is the other side if it helps. I am not an expert but this small (70mg) fragment is very typical, comparing it with other photos of this kind of meteorite. Quote Link to post Share on other sites
Mikestang 933 Posted May 2, 2019 Share Posted May 2, 2019 Angrite. Quote Link to post Share on other sites
dsvilko 12 Posted May 3, 2019 Author Share Posted May 3, 2019 Is that a guess or are you getting angry that you can't guess correctly? Quote Link to post Share on other sites
Haderly 99 Posted May 3, 2019 Share Posted May 3, 2019 Is it a type of Martian meteorite? My wild guess would be Shergottite Quote Link to post Share on other sites
dsvilko 12 Posted May 3, 2019 Author Share Posted May 3, 2019 Well done! From what I have seen, it's a typical shergottite though this is a significantly higher magnification than most of the other visible light photos. It's from a NWA 6963, actually pictured on wikipedia as a shergottite example. Maybe I could add my photo Here is another possibly simple one to guess. It's a tiny, 25mg fragment. Quote Link to post Share on other sites
Haderly 99 Posted May 3, 2019 Share Posted May 3, 2019 carbonaceous chondrite Quote Link to post Share on other sites
dsvilko 12 Posted May 3, 2019 Author Share Posted May 3, 2019 33 minutes ago, Haderly said: carbonaceous chondrite Yeah, but which one? Quote Link to post Share on other sites
Haderly 99 Posted May 3, 2019 Share Posted May 3, 2019 18 minutes ago, dsvilko said: Yeah, but which one? If I get anymore specific I will truly show my ignorance of meteorites. If I was forced to guess it would be Tagish Lake or Allende but I doubt either one is correct since you have posted a lot of NWA meteorites. Maybe a NWA 8534 since there is no size reference and could be a very small piece...so that is my final answer. Quote Link to post Share on other sites
dsvilko 12 Posted May 3, 2019 Author Share Posted May 3, 2019 It is Tagish Lake! It has that characteristic coal look - porous with a few chondrules. Per gram it is currently my most expensive meteorite ($1500/g). I am afraid to take it out of the plastic box it came in. That is why the photo is so low quality - took it through two layers of plastic. Quote Link to post Share on other sites
Haderly 99 Posted May 3, 2019 Share Posted May 3, 2019 I shouldn't have second guessed myself. Quote Link to post Share on other sites
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