Please identify this mineral or crystal.

Reply Sun 7 Jun, 2015 12:48 am
Hello all! I found this rock years ago at a river here in the Philippines, but up until now, I have no idea what it's called. I have searched the net just recently, and the closest I found was "rounded white prehnite." Can anyone please verify this? It doesn't seem right. Thank you for your time!

Here are a couple of photos: (please forgive the black dust specks, they are definitely not part of the white mineral)
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Type: Question • Score: 1 • Views: 905 • Replies: 3
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Reply Sun 7 Jun, 2015 11:39 am
The first one Alph, looks like chalcedony bubbles growing on volcanic glass


Man, we need you. But isn't chalcedony less brilliant white
Reply Sun 7 Jun, 2015 08:17 pm
Thanks for the reply! I'm getting closer to identifying it with "botryoidal chalcedony." As for it being less brilliant white, I've really no idea. I'm far from being an expert on rocks and minerals, let alone geology Very Happy
Reply Mon 8 Jun, 2015 02:12 am
I'm far from being an expert on rocks and minerals, let alone geology
Me nuther Al, in spite of some 40 years as a rockhound
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