Mineral - Howieite
Howieite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Na(Fe,Mn)₁₀(Fe,Al)₂Si₁₂O₃₁(OH)₁₃
Unit Cell
Physical Properties
Hardness
5 - 7
Streak
gray
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgray
Birefringence
Luster
Vitreous,
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
acicular, prismatic, tabular
Formation
Metamorphose
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Howieite