Danalite
Chemical Formula	Fe2+4Be3(SiO4)3S
Species	Silicates
Crystal System	Isometric
Mohs Scale	5-6
Specific Gravity	3.28-3.46
Color	Yellow, pink, reddish brown, red: colorless to pink in thin section
Streak	Grey white
Luster	Vitreous, Greasy
Refractive Index	n = 1.747 - 1.771
Diaphaneity	Translucent
Cleavage	Poor/IndistinctPoor on
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Octahedral and dodecahedral crystals, typically massive or as segregations
Geological Setting：In granites, granitic pegmatites, skarns, gneisses.