She/they, NB, pan, 30+ | Artist, writer, creator. | I have too many acronyms to list here. | I will block all empty blogs! | sideblog: dumfanting (original Star Wars fics and art, 18+)
I recently acquired this gorgeous Apache Tear obsidian nodule!
While in the American Southwest these obsidian nodules are nicknamed "Apache Tears," the mineralogical name for this stuff is marekanite!
(So, like, an aside. Usually when the healy-feely folks claim a stone has some association with a "native american legend" they are making it up and being weirdly fetishistic of those cultures. Looking at you, labradorite. But as far as I can tell, this stone really does get its name from a legitimate Apache legend. If anyone of that culture feels like chiming in, I would love to learn more about it.)
Anyway, Apache Tears are cool stuff. Here's how they form.
A volcano erupts, and deposits a lava flow which cools super rapidly. It cools so rapidly that it doesn't have time to grow crystals and become a rock, and instead hardens into a black, volcanic glass called obsidian. Over about ten thousand years, groundwater slowly infiltrates this obsidian. The water gradually changes it into a white stone called perlite. But within that mass of perlite, nodules of the original obsidian remain, looking like glassy black marbles. Those are Apache Tears!
This specimen came from Arizona, where volcanic activity has been going on for over two million years! You can see some white perlite still sticking to it. This piece is HUGE for an Apache Tear, which typically don't get much bigger than your thumbnail!