Aluminum
| View Cart ⇗ | Info
“The mineral corundum which includes the precious stones ruby, sapphire, and topaz, contains alumina, or aluminum oxide, Al2O3. It is found in nature crystallized in rhombohedral forms, having a specific gravity of 3.9, and is scarcely inferior in hardness to diamond.” —Hallock 1905
Galleries
Chemical Elements and CompoundsSource
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905) 11:60
Downloads
2281×2400, 487.0 KiB
973×1024, 72.9 KiB
608×640, 40.5 KiB
304×320, 16.0 KiB