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The stone that guided the Vikings across the sea
No compass, no GPS, no direct view of the sun. Just a transparent crystal that revealed its position.
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Obsidian in pre-Columbian culture
Obsidian isn't a mineral, but a volcanic glass that Mesoamerican cultures turned into a tool, weapon, ritual mirror and symbol of status.
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Moon Minerals
Discover Moon minerals: from Apollo 11 lunar basalt to meteorites that fell on Earth.
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Fossilized Ammonites: The Spiral That Survived Time
Discover what fossils are, how ammonites form, and why some shine with iridescent colors. Featuring specimens from Madagascar.
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Bismuth, the laboratory-grown crystal
Discover the geometric bismuth made with heat, time and pure physics.
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Moldavite: not a meteorite, not a mineral. What is it really?
Not a meteorite, not a mineral: discover what moldavite really is and why none has formed in 15 million years.
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Violet, green, red, blue... what determines a mineral's colour?
Why amethyst is violet and opal shimmers: the colour of minerals, explained.
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Shape tells the story: how to read a mineral by its crystal habit
Learn to read a mineral by its outer shape: what crystal habit tells you about how, where and how fast each stone formed.
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Tourmaline comes in far more than just black
Pink, green, blue, black, watermelon... each color is the result of a different chemical composition. The same mineral, endless possibilities.
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Emerald, sapphire, ruby. Raw and cut. Same stones, two prices.
An emerald can cost €3 or €30,000. It's the same mineral: what changes is whether the crystal is transparent or not.
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