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Thread: Unknown Rock

  1. #1 Unknown Rock 
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    Hello,
    My name is Estrella. I'm new here

    Anyway, I would like to know if anyone could help me clarify a rock I found in my backyard. My mom said it looks like the types you'd find by a river, yet our backyard is more of a sandy dirt, than moist and fertile dirt.

    • ​Rough Texture
    • Sparkles
    • Does not leave a streak on cement, cardboard, ect.
    • Fairly big

    All help is appreciated,
    Thank you.


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  3. #2  
    Forum Masters Degree
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    Without a picture, it will be next to impossible to identify. And your written description doesn't state approx hardness or color or approx density. Even with a high-res picture, it would be tough to identify -- but try to get a good picture of the specimen.

    Note to mods: this should probably be moved over to the earth science section.


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  4. #3  
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    It sounds like.....

    Old prospector's joke
    Geologist: What is this?
    Old prospector: Leaverite.
    Geologist: Leaverite?
    Old prospector: Yup, Leaverite there, it aint worth a darn thing.
    (drumroll and applause)

    Probably some granite. This Geology.com site might help you.
    Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks
    It is a commercial site but it does have a basic guide with pictures.
    Last edited by dan hunter; March 3rd, 2014 at 05:03 PM.
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  5. #4  
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    I tried to upload a picture and it wouldn't work.

    So then I uploaded it to another website and included a link in my description, but it said I couldn't have a link. But I'll try again.
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  6. #5  
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    As a new member you won't be able to load links yet.
    You might be able to copy and paste a photo but I am not even sure if that will work.

    What colour is the rock over all, black, white, green?
    Does it feel a lot heavier than other rocks that are about the same size?
    Or lighter?
    If the rock has different looking grains (little crystal bits) in it tell us what they look like.
    Which ones are the ones that glitter?
    Are some clear, are some pinkish, are some small flat and black?
    Can the rock be scratched with a nail or other hard piece of steel or does it scratch steel?
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  7. #6  
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    Oh alright.

    The color is mostly light gray with little spots of dark gray. (The dark gray spots have no chrystals)
    It's about the same weight as a regular rock.
    It does have little crystal bits. They are all flat, sparkly, and transparent.
    And it can be scratched against steel and leave a mark.
    dan hunter likes this.
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  8. #7  
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    Yup, it is Leaverite

    What you have sounds like Granite.
    Because you say it is almost white it might be what is called Leucogranite. Most granites have mica as well as other dark minerals in them so they look salt and pepper grading into dark.

    The white parts are likely potassium feldspar and the darker spots are likely quartz.

    It gets more complicated but without a lot more details it is about as far as I can go. It is probably easier for you to look up granite in a library or local museum to check it anyhow.

    edit: wait, did you mean the rock scratched the steel or that the steel scratched the rock?
    Last edited by dan hunter; March 3rd, 2014 at 09:12 PM.
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  9. #8  
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    Quote Originally Posted by dan hunter View Post
    Yup, it is Leaverite

    What you have sounds like Granite.
    Because you say it is almost white it might be what is called Leucogranite. Most granites have mica as well as other dark minerals in them so they look salt and pepper grading into dark.

    The white parts are likely potassium feldspar and the darker spots are likely quartz.

    It gets more complicated but without a lot more details it is about as far as I can go. It is probably easier for you to look up granite in a library or local museum to check it anyhow.

    edit: wait, did you mean the rock scratched the steel or that the steel scratched the rock?
    I searched up Leucrogranite and they don't look similar. (And it scratched the steel)

    I guess it would be easier, I am going to the library tomorrow. So I'll just look it up then. Thank you for your help.
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  10. #9  
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    You can try pasting the link to the photo in the chat.
    It is by will alone I set my mind in motion.
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  11. #10  
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    IS there any obvious layering in the sample?

    What size are the crystals?

    If layered I'm going for a mica schist. If not, and the crystals are smell, then a dolerite; if large, then a gabbro.
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