Almandine
Mineral Fe3Al2(SiO4)3
Also called Almandite and Carbuncle
About it
The common deep red garnet of mica schist, in dodecahedra and trapezohedra; Wrangell, Alaska, and Gore Mountain, New York, are famous, and Idaho's star garnets are almandine.
- Type
- Mineral
- Group
- Silicate (nesosilicate), garnet group
- Formula
- Fe3Al2(SiO4)3
- Hardness (Mohs)
- 7–7.5
- Specific gravity
- 4–4.3
- Streak
- white
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Isometric (cubic)
- Colours
- deep red, red-brown, purplish red, brownish black
- Transparency
- transparent, translucent, opaque
- Cleavage and fracture
- none; conchoidal to uneven fracture
Typical values: real specimens vary. For more, see mindat.org.