PurpleCharm

The geode looks like brain that was crystalized. Have you ever seen Mudfossil University on Youtube? It's fascinating. Now I look at rocks with a new eye.

I tried the local jeweler. They are clueless. I think it's aluminous spinel based on hours of reading research papers from the 80's. The host rock exhibits all the properties of Lamproite and after reading how spinel, in theory, is created, it matches the hardness and the attributes. Spinel is commonly mistaken for glass. The color that formed matches the existing phlogopite found in the host rock, among other mica type phenocrysts. The area it was found matches cataclysmic activity from the past where plasma like bursts were seen in 1811 and the air was electrostatic. It takes 800C to create

Adding more, in case someone is following this post. I believe the host rock is Lamproite Tuff, which would match with where it was found.

Looks like Record Keeper quartz contains trigons too.

It looks like a diamond still forming. Like it's a soft diamond. I know that sounds crazy. I swear the host rock is kimberlite. I'm going to get the host rock checked locally. Did I mention there were trigons when I looked under high magnification? It's really a strange rock. The rainbows fan out in the broken area on the host rock. They fan out from one direction throughout, like a rainbow stair step with perfectly conchoidial spheres.

I also dissected the host rock which really looks like kimberlite. I found what looks like a phlogopite phenocryst and broke it open. It's flaky to my fingernail like mica and it is also iridescent on the inside. It's yellowish on the inside with an orange-brown outside.

I noticed the pics I took have made the rock appear as if it has bubbles. The book I set it on made that strange appearance through the rock. Oh well. I'll take this down and probably start over with good pics.

Sorry, I corrected my post. It's harder than citrine, I believe, due to the white streak it leaves on the surface of the lavender rock and does not scratch it.

I tried to edit my post regarding the hardness. It's not 6.5, it's harder than glass. I thought glass was a 5 on the scale but it's showing a 7 which I thought was the hardness of quartz. Either way, it's harder than glass and as hard as citrine.

Can art glass be harder than glass on the mohs scale?

No bubbles, what looks like bubbles are the indentations/outcropping of the aggregate in the host rock removed. Those are on the bottom. The stone is harder than glass and it does not hold hot breath or fog. I'll post another pick of the host rock.

I just added another pic that shows the bottom of the stone where it was attached to the host rock. I'm in Kansas City, Missouri. If you know about the mud floods here, it could have come from the north or the south depending on the flow of the river when the New Madrid Fault went off.

I could see what you're saying. Though my stone is very clear. The pictures I took aren't so good. I'll try to take better pics. Also, the host rock is flat. The main stone is all one piece and not a conglomerate mass with the host rock. The main rock is cubed on the corners.

Really? Interesting. I think this rock is too clear to be opal even though there are rainbows. There is no milky part unless it is the smashed areas. Thank you for the reply!

Hello everyone! I'm new to this forum. I found a rock a while ago in the midwest river area known for flooding. It was attached to another rock then I broke it off. What is pictured is the rock part still attached to the other rock. Also a shard and its features and the main large rock. It has conchoidal fracture and mica like cleavage. Though it also seems to have 90 degree cleavage. It is 6.5 on the mohs scale. It is harder than amazonite not as hard as citrine. It is not waxy at all. It is very iridescent with rainbows on every level. Shiny and clear in areas. It is lavender in color thro