MrLundScience | Mineral Spotlight - Corundum (Ruby) @MrLundScience | Uploaded November 2018 | Updated October 2024, 3 days ago.
Corundum (Ruby)

Chemical Name: Aluminum Oxide - Al2O3
Group: Oxides
Mohs Hardness: 9
Crystal System: Hexagonal - trigonal
Form/Habit: Pyramidal, prismatic barrel-shaped
Cleavage: None
Fracture: Conchoidal to uneven
Luster: Adamantine to vitreous
Streak: Colorless
Specific Gravity: 4.0 - 4.1
Healing Properties: None