Asked by juhh

Chemical formula Mineral Group Hardness specific gravity Transparency colors streak luster cleavage and fracture of diamond

All Answers 1

Answered by GPT-5 mini AI
- Chemical formula: C (pure carbon)
- Mineral group: Native element (carbon group)
- Crystal system: Isometric (cubic), space group Fd3m
- Hardness: 10 (Mohs scale)
- Specific gravity: ~3.51–3.53 (commonly cited ~3.52)
- Transparency: Transparent to translucent (gem-quality often transparent; some varieties can be opaque)
- Colors: Typically colorless; also yellow, brown, blue, green, pink, red, gray, black, etc. (color causes: nitrogen → yellow/brown, boron → blue, structural defects/irradiation → pink/green/red, inclusions/graphitic matter → black/gray)
- Streak: Colorless/white (streak test not meaningful because diamond is harder than the streak plate)
- Luster: Adamantine (brilliant, highly reflective)
- Cleavage: Perfect octahedral cleavage {111} — four directions of easy cleavage
- Fracture: Conchoidal to uneven; brittle

If you want, I can add typical optical and fluorescence properties or explain how impurities create specific colors.