Input interpretation
almandine (mineral) | friedelite (mineral)
Images
Images
General properties
| almandine | friedelite alternate names | adelaide-rubin | adelaide ruby | alabandine ruby | alamandine | almandine garnet | almandite | oriental garnet | (none) formula | Fe^(2+)_3Al_2(SiO_4)_3 | Mn_8Si_6O_15(OH, Cl)_10 discovery year | | 1876
Basic properties
| almandine | friedelite density | 4.2 g/cm^3 | 3.07 g/cm^3 transparency | transparent | subtransparent | translucent | transparent | translucent birefringence | 0 | 0.03 luster | vitreous | resinous | vitreous | glassy Mohs hardness | 15/2 | 9/2 tenacity | brittle | streak | white | pink magnetism | nonmagnetic | nonmagnetic color | brown | brownish red | red | black | black red | brown | brown red | yellow | light pink | dark red fracture | brittle | conchoidal | brittle | uneven molar mass | 497.8 g/mol | 1064 g/mol
Units
Mineral identifiers
| almandine | friedelite Strunz ID | VIII/A.08-20 | VIII/H.28-70 Dana ID | 51.4.3a.2 | 72.4.1b.1
Crystallographic properties
| almandine | friedelite crystal system | cubic | monoclinic crystal class | 4/m-32/m | 2/m unit cell volume | 1531 Å^3 (cubic ångströms) | 2247 Å^3 (cubic ångströms) d-spacing | 2.569 Å (ångströms) | 1.54 Å (ångströms) | 2.873 Å (ångströms) | 2.56 Å (ångströms) | 7.17 Å (ångströms) | 3.6 Å (ångströms) intensity | 100% | 50% | 40% | 100% | 90% | 70% molecules per unit cell | 8 molecules per cell | 4 molecules per cell refractive indices | 0 | 0 | 0 | 0 | 0 | 1.83 | 1.63 | 0 | 0 | 0 | 0 | 0 dispersion | weak | r > v unit cell lengths | 11.53 Å (ångströms) | 11.53 Å (ångströms) | 11.53 Å (ångströms) | 23.33 Å (ångströms) | 13.4 Å (ångströms) | 7.447 Å (ångströms) unit cell angles | 90° (degrees) | 90° (degrees) | 90° (degrees) | 90° (degrees) | 105.1° (degrees) | 90° (degrees)
Wikipedia summary
Almandine
Almandine, also known as almandite, is a species of mineral belonging to the garnet group. The name is a corruption of alabandicus, which is the name applied by Pliny the Elder to a stone found or worked at Alabanda, a town in Caria in Asia Minor. Almandine is an iron alumina garnet, of deep red color, inclining to purple. It is frequently cut with a convex face, or en cabochon, and is then known as carbuncle. Viewed through the spectroscope in a strong light, it generally shows three characteristic absorption bands.