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Thread: Help ID some rocks/minerals

  1. #1 Help ID some rocks/minerals 
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    I'm thinking the first one is rhyolite. No idea on the others. I'm a total newbie.
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  3. #2  
    Time Lord Paleoichneum's Avatar
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    The first looks like a possible oolite
    The second and fourth both look like chalcedony.
    The third looks it might possibly be a "jasper" (another form of chalcedony)

    I cant be certain on any of these though


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    Number three looks to be indurated lacustrine clay with iron staining. I suspect it's a proglacial lake deposit, but, I could be wrong.
    I'm sorry, my responses are limited. You must ask the right question.

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    Quote Originally Posted by Lukatite View Post
    I'm thinking the first one is rhyolite. No idea on the others. I'm a total newbie.
    1. Maybe but i would prefer the Oolith if you have salt acid you could test it...
    2. Something with Potassium I would guess, it looks very alterated (maybe something like endo skarn)
    3. When I take a look at the fracture areas I would rather guess its something like agate and no sediment (like glauconite or chlorite) but the brown areas could be Hematite that would speak for chlorite
    4. The white part looks like quartz so its something volcanogenic/hydrothermal I think Obsidian is a good guess.
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  6. #5  
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    Thanks. I hope you don't mind these newbie questions. On another geology thread someone guessed this one to be rhyolite, but it's hard for me to see that. I guess if I chopped it open I would. Same opinion here?
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    Quote Originally Posted by Lukatite View Post
    Thanks. I hope you don't mind these newbie questions. On another geology thread someone guessed this one to be rhyolite, but it's hard for me to see that. I guess if I chopped it open I would. Same opinion here?
    well there is so much weathered material around I wouldn't say that without a crack, even the white material is looking like rhyolith/trachyt or something like this, but what should this red/brown material be... an odd potassic alteration???
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    What is salt acid? How do I test it?

    I have many more rocks to ask questions about. I'm thinking this is the place to do it, unless it's considered rude or annoying. If it IS okay, should I start a new thread or keep posting here?
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  9. #8  
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    Quote Originally Posted by Lukatite View Post
    What is salt acid? How do I test it?

    I have many more rocks to ask questions about. I'm thinking this is the place to do it, unless it's considered rude or annoying. If it IS okay, should I start a new thread or keep posting here?
    I'm new here, too. If carbonates goes in contact with salt acid (HCL) it begins to blubber, so if its blubbering you now its a carbonate.
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    Time Lord Paleoichneum's Avatar
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    I think you meant bubbling, not blubbering! Vinegar will work for testing also.
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    Quote Originally Posted by Paleoichneum View Post
    I think you meant bubbling, not blubbering! Vinegar will work for testing also.
    yes you are right. Does Vinegar bubble? I don't think so... but thats just my impression of taking vinegar to clean the water tap
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  12. #11  
    Time Lord Paleoichneum's Avatar
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    it does when used on carbonates such as calcite
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    Quote Originally Posted by Paleoichneum View Post
    it does when used on carbonates such as calcite
    yes but calcit also bubbles even you just take 3% HCL while dolomite doesn't make there a noise... if you know what i mean
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  14. #13  
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    it's a well-known difference between calcite and dolomite that the former effervesces (or bubbles) far more easily than the latter
    in the field you should be able to tell the difference between them by applying diluted hydrochloric acid to a freshly exposed surface (e.g. a chip that has just been knocked of a rock or stone) : calcite reacts readily, whereas the reaction with dolomite is more modest
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  15. #14 Pink Calcite 
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    Speaking of calcite, I have some blue calcite and a piece of pink calcite. Someone asked me if it could be rose quartz. Could use more opinions from my photo. Can these also be tested with vinegar?
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    Time Lord Paleoichneum's Avatar
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    there will be a reaction if it is a piece of pink calcite.
    If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. -Thorin Oakenshield

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  17. #16  
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    Quote Originally Posted by Lukatite View Post
    Speaking of calcite, I have some blue calcite and a piece of pink calcite. Someone asked me if it could be rose quartz. Could use more opinions from my photo. Can these also be tested with vinegar?
    yes, you can. I even dare a guess I think its rather rose quartz because calcit often has round structures because of the typical chemical weathering
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  18. #17  
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    Quote Originally Posted by Lukatite View Post
    Speaking of calcite, I have some blue calcite and a piece of pink calcite. Someone asked me if it could be rose quartz. Could use more opinions from my photo. Can these also be tested with vinegar?
    Although these photos aren't the best it seems to me that this pink mineral has greasy luster and lacks cleavage, both properties are typical to quartz. Another thing you can do is to try to scratch it with a knife, in case of calcite you will be able to do that, in case of quartz not so much, because quartz is much harder.
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  19. #18 Re: Help ID some rocks/minerals 
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    regarding calcite its known that calcite have a high bifre where as quatz dont have it
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