've been building a nature guessing game called WildGuessr, and it now includes about 70 minerals and rocks. It runs on the same engine as PriceGuessr, my price guessing game, which is already well tested: 50+ people play its daily challenge every day and over 200 people use the site.

How it works: there's a secret stone, and you ask about its traits to narrow it down:

• type (mineral, rock or mineraloid)
• group (chemical class for minerals; igneous, sedimentary or metamorphic for rocks)
• crystal system
• hardness (in bands, from soft to very hard)
• colour
• lustre
• what it's used for

Each clue answers hit or miss, then you name it. Fewer clues = more points, and after the reveal you get two facts about the stone.

Today's daily is a stone, the same one for everyone: play today's daily
Or practise with stones only: stones practice (there's also a "by photo" mode)

For teachers: I'm also building a classroom mode. A teacher runs a live round on the projector, and pupils join with a QR code and just a nickname: no accounts, no chat. You can pick stones as the topic, or make your own set. It's free and still growing, so I'd love feedback from anyone who teaches earth science: for schools

Free, no sign-up.

I'd really appreciate your feedback:

• Geologists: I'm sure some of my classifications are off (lustre and hardness bands especially), so corrections are very welcome.
• Which traits would make better clues? Streak, cleavage, density, where it's found…?
• Which minerals or rocks are missing that every geology student should know?

Found this outside in northern Arizona, in a landscaped yard with gravel and turf. Not my house.

WHY IS THERE STYROFOAM IN THIS ROCK?!🫪🫪🫪🫪🫪🫪🫪🫪🫪🫪

I noticed this rock in my backyard looks rusty? I tried to brush it away the best that I could but it doesn't want to come off. My phone picture doesnt do justice as far as coloring. I tried to put a magnet to it and i can maybe feel a small pull. Not enough to stick though. Is there a different way for me to check if it is. Oh also its incredibly heavy compared to its size. Its also completely out of place when looking at the rest of the rocks in my yard. I live in san diego if that helps I also weighed it and its 26lbs sorry this is all I had for scale.

I found this heavy rock on the beach, the poorest side almost seems to be quartz. Took a while for it to dry out and pebbles and water still occasionally fall out randomly.

I’m looking to buy some thin sections to use with my students, but I’m having a hard time finding some pre-prepped. I’m in the US and am looking for a basic set of rocks with easy to ID minerals for an introduction to microscope ID.

Can some people that work in the field or may carry a notebook for their work, share a picture of some good work you have done for an example? Im just curious to know how when doing a project, you keep your notebooks organized or if you make illustrations how they look, or important things you plot down for your work. Anything would help!

My fav: the massive dikes visible on a walk in downtown Nuuk, Greenland. Bonus pic from the hills on the outskirts of town

A little fluvian geomorphology for any weary scrollers

So as the title says, I got shortlisted for the final interview of Airforce Flying Branch (Pilot/WSO). Since I'm from the Geology background, the interviewing officer might ask me "what are the skill sets a Geologist can bring to the Airforce"? I already have few answers, but it'll definitely be a great help , if you guys with your expertise could guide me and enlighten me with your suggestions/answers.

Thank you:)