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Minerals - Franckeite | TerraCollect
Mineral - Franckeite
Franckeite
Fe²⁺(Pb,Sn²⁺)₆Sn⁴⁺₂Sb₂S₁₄
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
low
Formula
Fe²⁺(Pb,Sn²⁺)₆Sn⁴⁺₂Sb₂S₁₄
Unit Cell
a=3.67 b=6.26 c=17.42 α=95° β=96° γ=90° Z=2
Physical Properties
Hardness
2.5 - 3
Streak
black
gray
gray black
Optical Properties
Color
black
gray
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Composition
Elements
Mass
Pb
50.57
Fe
2.48
Zn
1.22
Sn
12.34
Sb
10.51
S
21.04
Bolivia (Palache et al. 1952)
Groups and Members
Franckeite-Group
Karten-Ebenen
Geologische Karte
Satelliten Karte
Density
Heavy (3,5-6)
Cleavage
Perfect after {010}
Fracture
Tenacity
Inelastic-flexible
triclinic-pinacoidal -
1
Space Group
P
1
(2)
Habit
spherical,
rosette,
tabular
Formation
hydrothermal
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Franckeite
