Red spinel on calcite. Spinel is a mineral, magnesium aluminium oxide (MgAl2O4). In its pure form it is colourless, but small amounts of chemical impurities create myriad hues. The red variety of gem quality has a specific name: ruby spinel. Calcite is a stable form of calcium carbonate, and is the main constituent of limestone, chalk and marble. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA |
Modell-Rechte: | nicht erforderlich |
Länge: | 34 Sekunden |
Seitenverhältnis: | 16:9 |
Restrictions: | - |