First direct measurements suggest that lonsdaleite, also called hexagonal diamond, is the strongest and hardest mineral found in nature.
The quest to make a crystal harder than diamonds
Recent Publications, Shock Physics
Crystal - Housewares
Breitling Wings Automatic Gold Two-Tone 38 Silver Dial Boxes
Crystal - Housewares
Diamonds Unearthed, Science
Pangolin Necklace
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Materials: Scientists create 'ultrahard' GLASS that's even harder
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Can scientists make a material harder than a diamond? - Quora
Crystal - Housewares
Crystal - Housewares