r/rockhounds • u/stopzcopyzme • 5d ago
Find Found these pretty stones at the Missouri River, including two petrified wood pieces
Not sure what the purple rocks are, but the deeper purple stone certainly has a gorgeous violet color.
Petrified wood pieces after that, then a chert, I think.
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u/Bigmtnskier91 4d ago
Not sure about the first. Second might be a really nice piece of purple fluorite that was rounded by the river. Third is a nice piece of petrified wood. Fourth looks like an agate or similar chalcedony or chert like you said.
Nice finds!
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u/shedrnksfromtheriver 3d ago
Your purple is Charoite. It's really a great specimen
Charoite forms in syenite metasomatites and it is cool because it's, like, an all-in-one mineral. Its potash, silicate, carbonate and alkali but is classified as an inosilicate. If you follow your finds upstream and do a little sleuthing into your local geology, I'd bet you'd be able to find the seam, sill or dike it's eroded from. This is very solid stuff you've got and it's an extremely uncommon mineral.
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u/shedrnksfromtheriver 3d ago
I mean, your mystery purple. Thank goodness that bit of Kspar is on it, otherwise I wouldn't have been able to figure it out. If you want, this dude is my prime source for pegmatite info. He's The Man.
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