I purchased this rock at an estate sale along with some rose quartz. The sellers had no information on it. My husband was able to break it today with a hammer, but I have no idea what the material is. I'm new to this and wanting to learn.
The outside looks like a regular grey rock and had a bit of "orange" peaking through so I decided to break it and see what was inside. I tried the knife test and it doesn't really scratch it (it's very light and when you wipe it off there are no scratch marks). It weighs 661 grams, I couldn't find a ruler to measure it though. There is a small thin part that broke off and when held to the light it's like a foggy clear ( you can see an item's shape and color but the image is foggy). I'm located in Washington state and purchased the rock here, but don't know if it's from this area.