the.com/almandine
The deep-red garnet that armed both engagement rings and machine-gun bearings.
name originNamed after Alabanda, ancient gem-cutting town in Turkey
hardnessHard enough to grind metal and saw stone
bearing dutyUsed as watch and instrument jewel bearings
birthstoneJanuary's garnet is often almandine variety
compositionIron-aluminum silicate, the most common garnet