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Identity HelpIgneous rock filled with many small green crystals

16th Aug 2019 19:43 UTCTama Higuchi Manager

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I bought this funky chunk at a local mineral shop for just $1.80!

Many of the vughs are filled with bright lime-green crystals.  The matrix is a porous yet heavy igneous rock, I'm guessing basalt?  I was able to scratch some of the green crystals with my topaz, with some difficulty.

Unknown locality; if anyone has an idea of the locality please let me know!

Imgur album with more photos and closeups:


16th Aug 2019 19:47 UTCFrank K. Mazdab 🌟 Manager

the green crystals are olivine (peridot)... the locality probably can't be determined because that rock type is common all over the world.

16th Aug 2019 20:09 UTCPaul Brandes 🌟 Manager

Agree.
Typical olivine (peridot) in a vesicular basalt. My first guess on location would be the San Carlos volcanic field in Arizona, but as Frank mentions, it could be from lots of places around the world.

17th Aug 2019 01:56 UTCTama Higuchi Manager

Very interesting, thank you guys!

17th Aug 2019 02:25 UTCKaterina protopsaltis

Yes I have some of this from recent Hawaiian volcanic activity and it can be found in old quarry Mortlake, Victoria, Australia. They can be precious gemstones 



18th Aug 2019 16:52 UTCMatthew Droppleman

Nice olivine crystals
 
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