Mineral - Rosasite
Rosasite
Chemical Properties
Mineral Class
Carbonates
Toxicity
none
Formula
(Cu,Zn)₂(CO₃)(OH)₂
Unit Cell
a=12.87 b=9.35 c=3.16 β=110° Z=4
Physical Properties
Hardness
4.5
Streak
greenblueblue green
Density
Heavy (3,5-6)
Cleavage
Fracture
Tenacity
Brittle
Optical Properties
Color
greenblueturquoise
Birefringence
0.143
Luster
Vitreous,
Silky
Transparency
translucent,
transparent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
P2 1 /c (14)
Habit
fibrous, spherical, acicular, kidney-shaped, grape-shaped
Formation
Secondarily formed by precipitation from aqueous solutions containing copper and zinc in the oxidation zone of supergene sulfide deposits
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Rosasite
Composition
Elements
Mass
CO₂
19.54
CuO
47.53
ZnO
24.60
H₂O
8.33
Italy (Palache et al. 1952)
Groups and Members
Malachite-Rosasite-Group