I’m back from my rock show! I got some Cool Rocks!
Another Turkish stick agate to join my collection! I can't get enough of this stuff. These form as pseudomorphs of selenite. A bunch of criss-crossing selenite crystals grow inside an empty pocket in the rock, and then the space around them fills in with agate. Eventually, the selenite crystals dissolve, and the hollows they leave behind are also filled with agate, preserving a record of their shapes!
Bonus! This pair has a nice green fluorescence.
Here is another Turkish agate. (Almost all of today's agates are from Turkey; Turkey produces some beautiful agate specimens.) This one has a really interesting pattern to its banding.
I actually picked this one out for its fluorescence, which is a stunning bright green.
Also from Turkey! Growing inside a super cool crust of volcanic rhyolite, this agate is called sagenite. Sagenite agate has a fibrous appearance because it is a pseudomorph of a fibrous zeolite mineral.
The last two from Turkey: a pretty red specimen with a sparkly central vug, and a weirdo with squiggles of yellow. What’s going on with that guy?
This one is from China! The red and orange agates from this locale are called "Fighting Blood" agate. I already have a Fighting Blood in my collection, but I thought this one was neat because its vug is full of amethyst!
Here are some things which are not agate!
This one is a lead mineral called plumbogummite! Specifically, these crystals are a pseudomorph of another lead mineral called pyromorphite. Over time, the lime green pyromorphite crystals were slowly replaced by the tealy plumbogummite. In a few of the broken crystals, you can still see a green pyromorphite core!
Hyalite opal! This rock has been on my bucket list, I am so excited. This form of opal is known for its water-clear, jelly-like globule formations. Though typically a colorless mineral, this specimen is tinted yellow due to iron staining. It’s also a mineral famous for its bright fluorescence… but this specimen’s glow is utterly unimpressive. :c I will be on the lookout for a more glowy specimen at future shows. Honestly, I’m just happy to finally own some at all!
This year, I also got some high-end mineral specimens! Take a look at these beauties.
Roselite! This rare, toxic mineral is full of arsenic. If I ate it I would probably die! Roselite’s deep red color comes from the cobalt in its chemical structure, and makes it highly sought after by collectors. This specimen is showing off a well defined lenticular crystal habit! Again, I cannot overstress how rare this stuff is. I spent… an inadvisable amount of money on it.
Oh, the best and most sparkly boy. This is wulfenite! I have wanted a piece in my collection for so long, and I’ve been waiting for just the right specimen to come along. It's a lead mineral, and it forms the coolest square, tabular crystals! This mineral is extremely brittle, which makes large, intact crystals of it very hard to find. But check out the huge tabular crystal on the right side of this specimen, it’s bigger than my thumbnail!!
And finally, I could not resist buying something silly.
This is Tully. He's a plush Tully Monster, which is my state fossil!