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what is an orthoceras

1. The Science: The 400-Million-Year Blueprint Orthoceras is a biological marvel preserved in stone, and its chemistry is a lesson in deep time. The Calcite Replacement: As the creature died...

what is a herkimer diamond

What is a Herkimer Diamond? (The "Fake" Gem Worth Real Money) If you’re digging in New York (or buying from a rock shop) and you see a crystal that is...

how to tell if a rock has gold in it

How to Tell if a Rock Has Real Gold (The 4 Simple Tests) You’re out hiking, and a dull white or rusty-looking rock catches the light. You see a glint...

how to tell if a rock is a geode

How to Tell if a Rock is a Geode (Before You Break It) If you’ve found a lumpy, round rock that looks like a dirty cauliflower, you’re probably heading to...

how to tell if a rock is meteorite

  Is This a Meteorite or Just a Rock? (Top 5 Rock Questions Answered) We’ve all done it. You’re walking along, and a stone catches your eye. It’s heavier than...

why is ammonite iridescent

Why is Ammolite Iridescent? The Physics of "Fossil Fire" If you take a Dremel to a piece of regular, grey ammonite, you’ll just get grey dust. But when you hit...