LithoCat

MineralAnnite
FormulaKFe²⁺3(AlSi₃O₁₀)(OH)₂
Crystal FormMonoclinic/Prismatic [2/m]
CleavagePerfect on {001}
ColorBlack, brown, green, blue
Density3.3 – 3.4 g/cm3
DiaphaneityTransparent to translucent
Hardness2.5 - 3.0
LustreVitreous, sub-metallic
Type Loc.Rockport, Essex Co., MA, USA
Dana 8 Class71.2.2b.3
Strunz Class8/H.11-110
Mindatmindat.org
WebMineralWebMineral
ID445