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Mineral - Axinite-(Mn)

Axinite-(Mn)Ca₂Mn²⁺Al₂BSi₄O₁₅(OH)
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₂Mn²⁺Al₂BSi₄O₁₅(OH)
Unit Cell
a=7.16 b=9.19 c=8.98 α=88° β=83° γ=77° Z=2
Physical Properties
Hardness
6.5 - 7
Streak
white
Density
Normal (2-3,5)
Cleavage
Good after {100}
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
browngrayyellowcolorless
Birefringence
0.009
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
X: Gelb-Farblos Y: Orange-Braun
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
axe-shaped, blocky, spear-shaped, tabular
Formation
Through metamorphism (mostly contact metamorphism)
Paragenesis
Twinning
Rarity
Common
Synonyms
Axinite-(Mn), Axinite
Composition
Elements
Mass
SiO₂
41.66
TiO₂
0.01
B₂O₃
5.96
Al₂O₃
18.00
Fe₂O₃
0.10
FeO
3.27
MnO
11.66
MgO
0.25
CaO
18.08
Na₂O
0.15
K₂O
0.02
H₂O
1.30
Minnesota (Dana 1892)
Groups and Members
Axinite-Group

Name and first discovery: Named after the ancient Greek word "axina" for "axe", in reference to its crystal form

Chemism: 

Synonyms: 

Varieties: 

Abbreviation: Ax-Mn

 

Famous locations

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

 

USA

(TL) (Analysis) Franklin Mine, Franklin, Sussex County, New Jersey, USA

 

Australia

Broken Hill, Yancowinna County, New South Wales, Australia

 

France

Saint-Christophe-en-Oisans, Isère, Auvergne-Rhône-Alpes, France

 

Italy

Gambatesa Mine, Reppia, Liguria, Italy

 

Japan

Obira Mine, Bungo-Ono, Oita Prefecture, Japan

 

Norway

Årvollåsen Quarry, Oslomarka, Oslo, Norway

 

Peru

Canta District, Lima, Peru

Cullhuay, Huaros District, Lima, Peru

Pachapaqui Mining District, Bolognesi, Ancash, Peru

 

Russia

Dalnegorsk, Primorskiy Kray, Russia

 

USA

Iron Cap Mine, Aravaipa, Graham County, Arizona, USA

Little Three Mine, Ramona, San Diego County, California, USA

Taylorsville, Taylorsville Mining District, Plumas County, California, USA

 

 

Literature

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