Can anyone identify these stones?

[2Minnesota]

These stones are on a necklace that my mom acquired. She would like to know what they are. They are transparent somewhat. Some have chips or crystal like inside. Thanks in advance for any help.

 

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[kcm]

Any idea where the stones originated from...what area?

 

[DDancer]

Looks to be tumbled quartz. Pretty uniform color as well.

 

[2Minnesota]

No history on them. Estate sale find. Thank you!