Almandine
| ID | 390 | |
|---|---|---|
| Mineral | Almandine | |
| Location | Brazil | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Almandine information at mindat.org |
|
Mindat data
| ID | 452 |
|---|---|
| Long ID | 1:1:452:5 |
| Formula |
Fe2+3Al2(SiO4)3
|
| IMA Status |
0 1 |
| Other Occurrences | The most common garnet, typically in mica schists and gneisses, from regionally metamorphosed argillaceous sediments and pelites; also in contact metamorphic hornfels. In granites and eclogites; in sedimentary rocks; as a detrital mineral. |
| Industrial | Abrasive. |
| Diapheny | Transparent,Translucent |
| Cleavage | None |
| Tenacity | brittle |
| Colour | Deep red, brownish red, red-violet, black |
| Hardness (min) | 7.0 |
| Hardness (max) | 7.5 |
| Luminescence | Non-fluorescent |
| Lustre | Vitreous - Resinous |
| About the name | Named in 1546 by Georgius Agricola [Georg Bauer] for Alabanda in Turkey, an ancient gem cutting center, presumably where almandine was fashioned into gemstones. |
| Streak | White |
| Crystal System | Isometric |
| Fracture type | Sub-Conchoidal |
| Morphology | Typically well-formed dodecahedra or trapezohedra, to 1 m; also in rounded grains and massive. |
| shortcode_ima | Alm |
| Group | Garnet Group |
Details
Price: € 10
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| Fe | Iron | |
| O | Oxygen | |
| Si | Silicium |