Apatite
Blue apatite in tumbled and natural form. Apatite is the mineral your tooth enamel is made of, Mohs 5, prized for its saturated blue-green color.
Inside Apatite
The literal reference point for hardness 5 on the Mohs scale — and the same mineral family as your tooth enamel.
The story: Apatite is so universally available that Friedrich Mohs picked it as the literal number 5 reference point on the hardness scale that still bears his name. Gem-quality apatite crystallizes in pegmatites and hydrothermal veins in blue, green, purple, and yellow depending on trace elements — and it’s also the source mineral behind roughly 90% of the world’s phosphate fertilizer.
Why collectors chase it: Rich, saturated color at an accessible price point, plus a genuinely fun fact: the hydroxylapatite in your own teeth and bones is chemically the same mineral family.
Care: Mohs 5 is soft for a gemstone — store away from harder stones that could scratch it, and clean with a soft cloth only (no ultrasonic or steam cleaning).
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