Beryl

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A hard beryllium aluminum silicate.
Beryllium is rare so usefulness as structural material is limited.
Al₂Be₃[Si₆O₁₈], hexagonal, Mohs 7.5 to 8.0

🟩 Green form of beryl is the widely known emerald.

Related

Bromellite: BeO, Mohs 9, hexagonal
Topaz … another unusually hard widely known silicate but avoiding elemental scarcity

External links

https://en.wikipedia.org/wiki/Beryl

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