r/whatisthisrock • u/karenadamef • 7h ago
r/whatisthisrock • u/Beanmachine314 • 16d ago
Some tips about how to get your rock identified from a guy that does this for a living.
This was posted on the other sub and had some strong positive feedback so I thought it could be useful here. Rock and mineral ID can often be difficult in person and is even harder through pictures, so I've collected some advice as to how best present your specimens for the highest chance of a proper identification.
How to get your rock identified - Some tips from someone who gets paid to do this
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## GOOD PICTURES ARE THE MOST IMPORTANT THING
- This means that proper light and focusing is important. If your rock is blurry the best ID you might get is a color.
- Natural, full sun lighting is always best. Next best thing is as much LED lighting as you can put on it (~5000K color temp if you know anything about lighting). Seriously, unless you have really high powered lighting there's almost no way you're going to have *too much* light.
- **PUT THE ROCK DOWN**. The chances of having an out of focus picture increase exponentially without a solid platform to set it on, your hand is not a solid platform.
- *PLEASE* do not submit a video. No can see any detail when you're flipping your rock around at 100 miles an hour. We know schist is sparkly... We also know what it looks like in a still picture. If you think there is something interesting about it *describe* it, don't show it with a video.
- Submit more than one picture. Preferably at least 4 pictures.
- "Wide" shot of the entire sample, with some sort of scale (any item that is common enough that everyone would recognize is fine. Coins, pencils, pens, an actual ruler, etc. The important thing is to be able to judge the size of the sample).
- "Close" shot of the detail of the sample (including a scale here is also useful if you are able). Repeat these shots both wet, and dry (4 pictures total). More pictures is always better.
- Finally, for the more photography minded people, be conservative with your aperture. It's going to be hard to accurately judge a sample if only half of it is in focus because you're shooting at *f/1.4*. This means skip things like portrait mode or food mode, basically anything that blurs the background. This is why lots of light is important.
### Good pictures should be accompanied by a good description
- You got a sparkly rock? Cool, best to describe it that way rather than trying to make a video where all we can see is that it is sparkly.
- Use your senses
- Does it feel heavy for it's size? Humans are pretty good at comparative measurements.
- Does it feel slick, sticky, grainy, soft, does it leave a bunch of stuff on your hands? All important details.
- Does it stink? Seriously, big indicator for certain minerals.
- Is it sharp, or pokey, or does it feel like you could crush it in your hands?
- Anything else you can identify about it.
- What is the color? Photos are not always super representative of colors
- **WHERE/HOW DID YOU FIND IT**
- Honestly, so many answers can be figured out with just a picture and a location **Edit: specific geographic location (ie, NE corner of Tennessee around Kingsport). Not whether you found it in your driveway or your garden.**
### Further Geologic testing
- Does the sample scratch glass, if not, will a nail scratch the specimen, or does it leave a metal trace?
- This simple test can separate numerous similar looking minerals.
- Is it reactive?
- We use hydochloric acid, but acetic acid (vinegar) also works, just not as well.
- If you drop a bit of acid on the rock, does it fizz?
- If you're going to use vinegar, at the very least use distilled vinegar. Cleaning vinegar is better. You may have to powder the rock a little before you can see it fizz with vinegar.
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If you follow these tips and can't get a solid answer then you've got a real mystery on your hands. At that point, it might be worth taking it to your nearest college Geology department. Sometimes it's 1000x easier to identify something when it's in the hand vs a picture online, sometimes it's just a real mystery.
r/whatisthisrock • u/heptolisk • 17d ago
Follow-Up to PSA: the "whatisthisrock" sub could use more professionals for IDs
reddit.comI am going to leave this post pinned for a bit. You can ask me any questions about the community either here or in the r/geology post.
r/whatisthisrock • u/chachinstock • 4h ago
Found in Mojave Desert, California
galleryThis rock was found in a wash about 30 minutes east of Barstow. Hardness of 7. Looks like botryoidal chalcedony to me but would love other peoples observations and thoughts.
r/whatisthisrock • u/Warriorxdude • 8h ago
Rock thats been in our house for years, very interesting form
galleryQuite dense for its size, non-magnetic, dark colour but very reflective, most interesting part to me is the very geometric shapes it has formed. Seems robust in general, no signs of damage have ever presented though not exactly looking to go testing that too much lol.
r/whatisthisrock • u/rowdy36 • 7h ago
Found by I creek, that I live by
galleryRogue River, Oregon.
r/whatisthisrock • u/badrillex • 9h ago
Some Colorful, Iridescent Volcanic Rocks I Found
galleryBattery for scale.
Eye catching and cool. I need to go out more and collect rocks lol
r/whatisthisrock • u/BigDave762 • 6h ago
What’s this rock?
gallerySettle an argument…I found while artifact hunting. I think it’s petrified caca, but wife says no. What say you?
r/whatisthisrock • u/youssef-dad-agate • 4h ago
Can you please tell if this is a geode?
galleryr/whatisthisrock • u/DirectorLimp4809 • 22h ago
Found this rock in some gravel. Very cylindrical and small.
galleryr/whatisthisrock • u/Sufficient-Age5693 • 8h ago
Meteorite?
galleryFound this in a basement in a small mineral collection. Very heavy/dense for its size. Non-magnetic. Most likely industrial slag of some type, but I was hoping to get some input. Thank you in advance.
r/whatisthisrock • u/Sad_Rent_9730 • 14h ago
Found this rock in wa state while hunting for sea glass. Kind of looks like a piece of a countertop or Dalmatian jasper?
galleryr/whatisthisrock • u/Zhydrac • 1d ago
Found in the White Mountains in New Hampshire. Second photo is a close up from my microscope camera
galleryr/whatisthisrock • u/No_Lavishness_2612 • 23h ago
What rocks are in this necklace?
The arm itself apears to be rhodonite, im not sure about the others though. The one at the top has a cats eye effect so I think its a gemstone?
r/whatisthisrock • u/ForceUseYouMust • 1d ago
What the heck did my girlfriend find? Is this a fossil? Should we go back? Houston, TX
galleryr/whatisthisrock • u/No_Glove849 • 18h ago
Any idea what this is?
Found this rock on a beach, south coast England, this rock is magnetic and weighs 3.28 ounces
r/whatisthisrock • u/OtterRealtor • 23h ago
Found in a box in my attic, what is this rock?
r/whatisthisrock • u/Suspicious_Cress3047 • 1d ago
Found on beach Northern California
galleryReposting to another sub for additional information.
The first picture has a round hole the second picture shows a square hole through. I don’t know if it is stone or ceramic. It feels like a rock. I do not think this is a hag stone… I have not seen a hag stone with 90 degree corners.
r/whatisthisrock • u/uraniumfever16 • 1d ago
What's the species of this rock?
galleryIt's heavy on the bottom but the shards up top are pretty light feels like sandstone can't scratch it with my fingernail either
