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Mineral - Babingtonite

BabingtoniteCa₂(Fe²⁺,Mn)Fe³⁺[Si₅O₁₄OH]
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₂(Fe²⁺,Mn)Fe³⁺[Si₅O₁₄OH]
Unit Cell
a=7.50 b=12.18 c=6.68 α=86° β=94° γ=112° Z=2
Physical Properties
Hardness
5.5 - 6
Streak
graygreengreen grey
Density
Normal (2-3,5)
Cleavage
Perfect after {001}, good after {010} and {100}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackgreen black
Birefringence
0.025
Luster
Vitreous
Transparency
translucent,
opaque
Pleochroism
X: Dunkelgrün-Schwarz Y: Violett-Braun Z: Braun
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
blocky, prismatic, radial, tabular
Formation
Magmatic, both volcanic and plutonic and in pegmatites Through metasomatism in skarns
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Babingtonite
Composition
Elements
Mass
SiO₂
52.80
TiO₂
0.29
Al₂O₃
2.41
Fe₂O₃
13.17
FeO
7.68
MnO
1.89
MgO
0.92
CaO
19.19
Na₂O
0.48
H₂O
0.91
Norway (Dana 1892)

Name and first discovery: Named after the Irish-British mineralogist William Babington (1756-1833). First described in 1824  

Chemism: 

Synonyms: 

Varieties: 

Abbreviation: Bab

 

Famous locations

(TL) Type locality                          (analysis) Chemical element distribution, see above

 

Norway

(TL) (Analysis) Arendal Iron Mines, Arendal, Agder, Norway

 

Antarctica

Litell Rocks, Victoria Land, East Antarctica, Antarctica

 

China

Qiaojia County, Zhaotong, Yunnan, China

Hongxizhen Mining District, Meigu County, Sichuan, China

 

India

Malad Quarry, Malad, Maharashtra, India

 

Italy

Seula Mine, Baveno, Piedmont, Italy

 

Namibia

Goboboseb Mountains, Brandberg, Erongo Region, Namibia

 

Sweden

Grönsjöberget, Borlänge, Dalarna, Sweden

 

USA

Roncari Quarry, East Granby, Hartford County, Connecticut, USA

O & G Southbury Quarry, Woodbury, Litchfield County, Connecticut, USA

Cheapside Quarry, Deerfield, Franklin County, Massachusetts, USA

Lane & Son Quarries, Westfield, Hampden County, Massachusetts, USA

Hampden Quarry, West Springfield, Hampden County, Massachusetts, USA

Blueberry Mountain Quarry, Woburn, Middlesex County, Massachusetts, USA

Prospect Park Quarry, Prospect Park, Passaic County, New Jersey, USA

 

 

Literature

Dana, J. D., & Dana, E. S. (1892). Thesystem of mineralogy of James Dwight Dana, 1837-1868: descriptive mineralogy. J. Wiley & sons.