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Minerals - Rhodonite | TerraCollect
Mineral - Rhodonite
Rhodonite
CaMnâMn[Siâ Oââ ]
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
CaMnâMn[Siâ Oââ ]
Unit Cell
a=9.76 b=10.50 c=12.21 α=109° ÎČ=103° Îł=83° Z=20
Physical Properties
Hardness
5.5 - 6.5
Streak
white
Density
Heavy (3,5-6)
Optical Properties
Color
red
pink
Birefringence
0.013
Luster
Greasy,
Pearly
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Composition
Elements
Mass
SiOâ
45.46
AlâOâ
0.27
FeO
0.96
MnO
50.54
ZnO
0.01
MgO
0.55
CaO
2.25
India (Dana 1895)
Karten-Ebenen
Geologische Karte
Satelliten Karte
Cleavage
Perfect after {110} and {1
1
0}, distinct after {001}
Fracture
conchoidal,
uneven
Tenacity
Brittle
Point Group
triclinic-pinacoidal -
1
Space Group
P
1
(2)
Habit
leafy,
blocky,
wedge-shaped,
massive,
prismatic,
tabular
Formation
(1) Metamorphic in manganese-rich, siliceous sediments through regional or contact metamorphism (up to the amphibolite facies). (2) Metasomatic in hydrothermal ore deposits through the reaction of manganese-bearing fluids with silicate rocks
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Rhodonite
Groups and Members
Rhodonite-Group
