16 Photos
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.

It is a rare mineral which occurs in granites, tin bearing pegmatites, contact metamorphic skarns, gneisses and in hydrothermal deposits. It occurs in association with magnetite, garnet, fluorite, albite, cassiterite, pyrite, muscovite, arsenopyrite, quartz, and chlorite.

Danalite was first described in 1866 from a deposit in Essex County, Massachusetts and named for American mineralogist James Dwight Dana (1813–1895).

It has been found in Massachusetts, New Hampshire, Sierra County, New Mexico; Yavapai County, Arizona; Needlepoint Mountain, British Columbia; Walrus Island, James Bay, Quebec; Sweden; Cornwall, England; Imalka and Transbaikal, Russia; Kazakhstan; Somalia; Tasmania; Western Australia and Hiroshima Prefecture, Japan.