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Baron Axel Fredrik Cronstedt (/kroonstet/ December 23 1722 – August 19 1765) was a Swedishmarker mineralogist and chemist who discovered nickel in 1751 as a mining expert with the Bureau of Mines. Cronstedt described it as kupfernickel (the devil's copper). He was a pupil of Georg Brandt, the discoverer of cobalt. Cronstedt is sometimes considered one of the founders of the modern mineralogy.

Cronstedt also discovered the mineral scheelite in 1751. He named the mineral tungsten, meaning heavy stone in Swedish. Carl Wilhelm Scheele later suggested that a new metal could be extracted from the mineral. In English, this metal is now known as the element tungsten.

In 1753, Cronstedt was elected a member of the Royal Swedish Academy of Sciences.

In 1756, Cronstedt coined the term zeolite after heating the mineral stilbite with a blowpipe flame.

Cronstedt was described as 'the founder of Mineralogy' by John Griffin in his 1827 A Practical Treatise on the Use of the Blowpipe.

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