Diamond

Hardness: 10 (Mohs scale), Color: Typically colorless, but can be yellow, brown, green, blue, pink, red, Luster: Adamantine (brilliant), Crystal Structure: Isometric (cubic), often octahedral, Cleavage: Perfect octahedral (but difficult to induce), Specific Gravity: 3.5-3.53

Formation Process: Diamonds form under extremely high pressure and temperature conditions deep within the Earth's mantle (100-200 km deep). They are brought to the surface through deep-source volcanic eruptions via kimberlite and lamproite pipes. Geological Age: Most natural diamonds are 1 to 3.5 billion years old.

Industry: Cutting, drilling, grinding, and polishing tools due to their extreme hardness. Jewelry: Highly prized as gemstones in rings, necklaces, earrings, and other ornaments due to their brilliance and durability. Construction: Used in drill bits for mining and construction.

Famous diamonds include the Hope Diamond, Cullinan Diamond, and Koh-i-Noor. Diamonds are the hardest known natural material. They have been sought after for centuries for their beauty and durability, and are a symbol of love and commitment.

How to Identify: In the field, diamonds are almost exclusively found in kimberlite and lamproite pipes. Their extreme hardness can be tested by scratching other materials (though this can damage the diamond). Experienced prospectors look for characteristic indicator minerals like pyrope garnet, ilmenite, and chromite. Common Locations: Major diamond-producing countries include Russia, Botswana, Canada, Australia, South Africa, and Angola. Tips for Collectors: Natural diamond crystals are coveted by collectors; however, they require careful handling due to their value. Look for unpolished, well-formed crystals from known localities.