Got A Rock you Want Identified? Post it here! gimme a good picture or 3 or 4!

Bgonleif said:
I totally grasp that but all quartz I have WILL NOT make the Diamond detector go off even a little bit if I have it set to four bars and put it on a piece of quartz turn it every direction it will not hit in the red but I have a pile that does. I know in the synthetic world there are several synthesized minerals that can make it go off, but all of these have been found in nature on their own nowhere near a spot that it could be made synthetically. I've been trying to research whether white topaz or white sapphire can make a diamond detector go off but have no avail to find any information on that
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Diamond detectors are known to be unreliable. They are used in jewelery shops to test for diamond imitations, not used among rock hounds.
To put it frank: You are using it in a way it is not intended and wondering why it's not working as intended.:occasion14:

BTW, yes, white topaz and sapphire can both make the tester go off. In a gemological context, further testing is required.
 

Thought these looked interesting.

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When I google image searched it the only thing close were what I think were diabase. The difference is that my rock is all the same color and doesnt look like strips of other types of rock mixed in possibly creating the grooves. There was one other rock about the same size next to it on the river bank. But none others found (not even smaller ones) within hundreds of feet.
I left them there, should I go get them and bring them to a geologist?tmp_27324-20180428_1637061829348137.jpgtmp_27324-20180428_1636241538256950.jpg
 

llkrea said:
When I google image searched it the only thing close were what I think were diabase. The difference is that my rock is all the same color and doesnt look like strips of other types of rock mixed in possibly creating the grooves. There was one other rock about the same size next to it on the river bank. But none others found (not even smaller ones) within hundreds of feet.
I left them there, should I go get them and bring them to a geologist?View attachment 1584568View attachment 1584567
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Use a magnifying glass or even loupe and I think you'll find there are "grains" of other "minerals" in there. (diabase is a rock made of several minerals)
I can just seem them in the photo at max enlargement.
 

Eu_citzen said:
Don't you know the test procedure by now?:occasion14:
Hardness & streak test!
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Streaks red. Also has little strips of reflective material in it. The picture doesn't do it justice it looks like a rainbow. It's just a crust on what looks like sandstone.
 

Hi! Very interesting rocks I see here! I would appreciate if someone could share their vast knowledge to help me identify this rock I found over 30 years ago. It may not look so difficult but I found it in a field on the east side of San Antonio, it definitely did not belong there.
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Bldr said:
Hi! Very interesting rocks I see here! I would appreciate if someone could share their vast knowledge to help me identify this rock I found over 30 years ago. It may not look so difficult but I found it in a field on the east side of San Antonio, it definitely did not belong there.
View attachment 1584888
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The picture looks like lava. There was a "very explosive" volcano in the Austin area so maybe it is a lava bomb that was ejected from that volcano or maybe a closer one that long ago eroded totally away. Check this link or google volcanoes in texas. https://www.google.com/search?q=anc...ome..69i57.16405j1j7&sourceid=chrome&ie=UTF-8
Also this one. https://www.google.com/search?q=lav.....69i57j0l5.9781j0j7&sourceid=chrome&ie=UTF-8
 

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Ok so i did a s.g. on some of the rock and yes u are 100% correct about false reading, especially on raw material. But when s.g. weighing is involved there's no way to misidentify minerals, unless major impurities or inclusions, am I correct? None the less none of which came up as 2.65s.g.(quartz) they came up as 2.62(albite) and 2.7-2.81 which I would suspect to be beryl family. How do I gain more Knowledge and/or ability to know what I have so I can sell anything
 

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Galena In Quartz (lead in crystal form)

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