Diamond
ID: 21
Diamond
Chemical Formula
C
Hardness (Mohs)
10
Crystal System
Isometric
Streak
Colorless
Luster
Adamantine (brilliant)
Diaphaneity
Transparent to opaque
Color
Colorless (most prized), yellow, brown, green, blue, pink, red, black.
Crystal Habit / Mode of Occurrence
Isometric - Hexoctahedral; commonly octahedral, dodecahedral, cubic; also massive, granular, bort (industrial grade).
Fun Facts
Diamonds form under immense pressure and high temperatures deep within the Earth's mantle and are brought to the surface by volcanic eruptions in rocks called kimberlites and lamproites. Common Uses: Gemstone, abrasive (cutting, grinding, polishing), cutting tools, drill bits, high-pressure research anvils.