This is an example of botryoidal growth, where microcrystals form a bubbly texture (or without the crystals in opal's case). Many minerals can grow this way. Agate/chalcedony is one typical example, but there are plenty of other options so a photo alone won't ID it. So as Barbra said, getting some mkre data is your next step. Hardness may be sufficient to strongly suggest agate, since very few things harder than agate ever show botryoidal growth.
Post subject: Re: another one that does not respond to muratic acid
Posted: Thu May 03, 2018 2:03 pm
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Joined: Tue Apr 10, 2018 5:34 am Posts: 31
I tried this mineral ,and the one ,you assume is the agate (the one on the black scarf), to scratch by steel awl ... but almost can not do it ... I tried to scratch one or the other mineral, but I can not to figure out which is hard ... there are almost no traces... bounce one from another and even sparking.. I'm going to try the glass cutting tool...that blade should be of diamond..
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