so when you start polishing rocks at some point we've all asked ourselves did I polish a piece of asphalt1yr ⋅ Which_Professor_7181 ⋅ r/RockTumbling
I found this rock in the woods in the keewanaw of the upper peninsula of michigan. I believe it's rhyolite but instead of calcite it's some kind of quartz and I don't know what the green is but it's really hard1yr ⋅ Which_Professor_7181 ⋅ r/geology
