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Mineral - Axinite-(Fe)

Axinite-(Fe)Ca₂Fe²⁺Al₂BSi₄O₁₅OH
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₂Fe²⁺Al₂BSi₄O₁₅OH
Unit Cell
a=7.14 b=9.19 c=8.95 α=92° β=98° 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
browngraygray brownred brown
Birefringence
0.009
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
X: Braun-Grau Y: Violett Z: Grün-Gelb
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
axe-shaped, leafy, blocky, prismatic, tabular
Formation
In metamorphic rocks and their alpine clefts Magmatic in pegmatites
Paragenesis
Twinning
Penetration twins
Rarity
Common
Synonyms
Axinite-(Fe), Axinite
Composition
Elements
Mass
SiO₂
43.14
TiO₂
0.10
B₂O₃
6.12
Al₂O₃
16.70
Fe₂O₃
1.28
FeO
7.12
MnO
1.66
ZnO
0.04
MgO
1.34
CaO
19.76
Na₂O
0.36
K₂O
0.23
H₂O
1.56
Mexico (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-Fe

 

Famous sites

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

 

France

(TL) Saint-Christophe-en-Oisans, Isère, Auvergne-Rhône-Alpes, France

Le Rocher d'Armentier, Isère, Auvergne-Rhône-Alpes, France

Le Bourg d'Oisans, Isère, Auvergne-Rhône-Alpes, France

 

Australia

Colebrook Hill Mine, Rosebery, Tasmania, Australia

 

China

Dachang Ore Field, Nandan County, Guangxi, China

 

Germany

Kuhlenberg Quarry, Silbach, North Rhine-Westphalia, Germany

 

Italy

Miage Glacier, Courmayeur, Valle d'Aosta, Italy

 

Japan

Toroku Mine, Takachiho, Miyazaki Prefecture, Japan

 

Mexico

Santa Bárbara Mine, Santa Barbara, Chihuahua, Mexico

 

Pakistan

Char Kohan, Kharan, Balochistan, Pakistan

Khaplu, Ghanche, Gilgit-Baltistan, Pakistan

Tormiq Valley, Haramosh Mts, Gilgit-Baltistan, Pakistan

Alchuri, Shigar Valley, Gilgit-Baltistan, Pakistan

 

Peru

Sayán, Huaura, Lima, Peru

Molletambo Quarry, Yauca del Rosario, Ica, Peru

 

Russia

Dodo Mine, Saranpaul, Khanty-Mansi, Russia

Puiva Mount, Saranpaul, Khanty-Mansi, Russia

Dalnegorsk, Primorskiy Kray, Russia

 

Spain

La Juanona Quarry, Antequera, Andalusia, Spain

Les Collades Ravine, Casterner de les Olles, Catalonia, Spain

 

Switzerland

Piz Vallatscha, Val Medel, Grisons, Switzerland

Le Catogne, Sembrancher, Valais, Switzerland

 

UK

Stamps and Jowl Zawn, Botallack, Cornwall, England, UK

 

USA

New Melones Dam, Calaveras County, California, USA

Jensen Quarry, Jurupa Mountains, Riverside 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.