Mineral - Geminite
Geminite
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
Cu²⁺(AsO₃OH) · H₂O
Unit Cell
a=9,84 b=10,82 c=15,73 α=96° β=91° γ=103° Z=16
Physical Properties
Hardness
3 - 3.5
Streak
green
Density
Cleavage
Perfekt auf (001)
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
green
Birefringence
0,114
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
leafy, spherical, spear-shaped, radial, tabular
Formation
Oxidationszone von Arsen-Lagerstätten
Paragenesis
Twinning
Kontaktzwillinge nach (001)
Rarity
Rarely
Synonyms
Geminite
Composition
Elements
Mass
As₂O₅
52,40
CuO
36,50
H₂O
11,00
Frankreich
Groups and Members
Koritnigit-Gruppe