If you are any kind of rockhound, you cannot miss a
“rock show.” Yesterday, to maintain our rockhound status, Desiree, my sister
Deb, and I took time to check out the annual Helena Mineral Society Gem and
Mineral Show.
Among all the vendors of fossils, gems, cut stones,
and unique mineral specimens, we found a guy selling loads of geodes. Geodes
are nature’s little treasure chests—plain on the outside, wholly extravagant
within. When you split one open, it feels like the earth hid a galaxy in a
rock, then chucked it off to the side.
Making the geode experience far more interesting
was the fact that you picked your own whole stone and then cracked it open
yourself using a chain that applied great pressure when you turned a ship’s
helm wheel, all of which was mounted on an old wooden barrel.
The geodes were formed first as a bubble of gas
trapped in cooling lava, leaving a hollow behind as the volcano released its
heat. Then, over long stretches of time, mineral-rich water seeped into that
cavity, and through crystallization, layers of quartz slowly formed along the
inner walls.
After watching a couple of other people crack open
geodes, Desiree purchased one and took a turn at the wheel. As the vendor held
the stone in position, she cranked down the pressure until the geode popped
into two.
Ta-da! Each half bloomed with a dazzling array of
crystals.
The Rock Show Floor as Seen from the Mezzanine
Desiree Splitting a Geode
Inside the Geode
—Mitchell
Hegman