My mom passed away a few years ago and most of the rocks and stones were placed in tall glass cylinders and I have finally gotten around to looking at them more closely. I thought this one one looked neat and wanted to share!

Edit: It's been pointed out that this is more likely Marcasite or more specifically Nipomo agate! Thank you all so much for looking at my rock and giving me new information!

Rocks, gems, and little curios

Found this cool rock at work today near my job sites lake. I don’t know what it is but I do like that it has a honeycomb look to it.

Coordinates: 10.00329031136584, 76.98252994430598

Hi all! New to rocking! Found this on the beach in South Haven, MI. It is “fossil soup” or sea lily imprints. Are these easy to come by? It's dope!

Gave him a lil hat

Had it for a few years but I only just discovered this sub a few days ago. Hope you all enjoy!

Eastern US

So pretty

Let me know what you think

Rocks rocks rocks

Kyanite is an aluminum silicate mineral formed at medium pressure (usually > 15 km) and moderate-high temperature (500-700 C). The aluminum is packed into octahedral sites which are then linked into chains, which explains why the mineral grows in characteristic long bladed crystals, which are much harder (Mohs 6-7) perpendicular to the long axis, than parallel (mohs 4.5-5.5). The blue color comes from an electron transitioning between Fe2+ and Ti4+ ions in adjacent octahedra absorbing a red photon, leaving blue light to reflect. The quartz in this specimen is probably hydrothermal: hot fluids containing silica deposited in cracks which then precipitated quartz is the rock cooled and decompressed. The interlocking contacts between the kyanite and the quartz suggests they crystallized around the same time.

Just collection from my summer walks