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Axinite-(Fe)

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Formula:
Ca2Fe2+Al2BSi4O15OH
System:
Triclinic
Colour:
Brown, clove-brown, plum ...
Hardness:
6½ - 7
Member of:
Name:
Originally named Espéce de Schorl by Johann Gottfried Schreiber in 1781. Named Schorl violet and Schorl transparent lenticulaire by Romé de Lisle in 1785. Named Thumerstein by Abraham Gottlieb Werner in 1788, later spelled Thumite. Named Yanolite by Jean Claude de la Métherie in 1792. Named Glasschörl by Blumenberg in 1799 (also glasstein). Named axinit in 1797 by Rene Just Haüy from the Greek αξίνα ("axina") for "axe", in allusion to the common habit of its crystals. Renamed ferroaxinite by Waldemar T. Schaller in 1909 for iron dominance in the formula. Renamed with suffix "-Fe" by IMA in 2008.

Classification of Axinite-(Fe)

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.BD.20

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
56.2.2.1

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
17.5.47

17 : Silicates Containing other Anions
5 : Borosilicates
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Type Occurrence of Axinite-(Fe)

Occurrences of Axinite-(Fe)

Geological Setting:
Low to high grade regionally metamorphosed rocks, contact metamorphic rocks, pegmatites.

Physical Properties of Axinite-(Fe)

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Brown, clove-brown, plum blue, pearl gray
Streak:
White
Hardness (Mohs):
6½ - 7
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {100}
Poor on {001} {110} {011}
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.25 - 3.28 g/cm3 (Measured)    3.33 g/cm3 (Calculated)

Crystallography of Axinite-(Fe)

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.1437(4) Å, b = 9.1898(6) Å, c = 8.9529(4) Å
α = 91.857(6)°, β = 98.188(5)°, γ = 77.349(4)°
Ratio:
a:b:c = 0.777 : 1 : 0.974
Z:
2
Morphology:
Flattened, axe head shaped, granular, massive
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Axinite-(Fe)

Type:
Biaxial (-)
RI values:
nα = 1.672 - 1.693 nβ = 1.677 - 1.701 nγ = 1.681 - 1.704
2V:
Measured: 69° to 87°, Calculated: 62° to 82°
Max Birefringence:
δ = 0.009 - 0.011
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong

Chemical Properties of Axinite-(Fe)

Formula:
Ca2Fe2+Al2BSi4O15OH
Essential elements:
All elements listed in formula:

Relationship of Axinite-(Fe) to other Species

Series:
Forms a series with Axinite-(Mn) (see here)
Member of:
Other Members of Group:
Axinite-(Mg)Ca2MgAl2BSi4O15OH
Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
Tinzenite(Ca,Mn2+)2Mn2+Al2BSi4O15(OH)
9.BD.05BertranditeBe4(Si2O7)(OH)2
9.BD.10HemimorphiteZn4Si2O7(OH)2 · H2O
9.BD.15JunitoiteCaZn2Si2O7 · H2O
9.BD.20Axinite-(Mg)Ca2MgAl2BSi4O15OH
9.BD.20Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
9.BD.20Tinzenite(Ca,Mn2+)2Mn2+Al2BSi4O15(OH)
9.BD.25VistepiteSnMn4B2Si4O16(OH)2
9.BD.30BoralsiliteAl16B6Si2O37
9.BD.35Werdingite(Mg,Fe)2Al14Si4B4O37
17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8
17.5.2ReedmergneriteNa[BSi3O8]
17.5.3SearlesiteNa(H2BSi2O7)
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.6KalborsiteK6Al4BSi6O20(OH)4Cl
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2
17.5.8PoudretteiteKNa2B3Si12O30
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.10DatoliteCa(HBSiO5)
17.5.11DanburiteCaB2Si2O8
17.5.12HowliteCa2B5SiO9(OH)5
17.5.13BakeriteCa4(H5B5Si3O20)
17.5.14OyeliteCa10Si8B2O29 · 12.5H2O
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O
17.5.17Serendibite(Ca,Na)2(Mg,Fe2+)3(Al,Fe3+)3[O2|(Si,Al,B)6O18]
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)(Ca,Ce)4(Ce,Y)2(Ti4+,Fe3+,Al)[B4Si4O22](OH)2
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)(Ce,La,Y,Th)5(Si,B)3(O,OH,F)13
17.5.23Tritomite-(Y)(Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.28 Ferridravite
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OH
17.5.30UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11
17.5.33LeucospheniteBaNa4Ti2B2Si10O30
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2Cl
17.5.37Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
17.5.41Axinite
17.5.42Tinzenite(Ca,Mn2+)2Mn2+Al2BSi4O15(OH)
17.5.44SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.45Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2

Other Names for Axinite-(Fe)

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Axinite-(Fe)

Reference List:
Anderson, C. (1906) Mineralogical Notes: No. III - Axinite, petterdite, crocoite, datolite. Records of the Australian Museum: 6(3), 133-144.
Schaller, Waldemar T, (1909) in Dana, Edward S. (1909) The System of Mineralogy of James Dwight Dana, appendix II, P. 11.
American Mineralogist (1981): 66: 428-431.

Grew, Edward S., and Anovitz, L. M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

J. Filip, Uwe Kolitsch, M. Novák and O. Schneeweiss (2006): The crystal structure of near-end-member ferroaxinite from an iron-contaminated pegmatite at Malešov, Czech Republic. Can. Mineral. 44, 1159-1170.

Internet Links for Axinite-(Fe)

Specimens:
The following Axinite-(Fe) specimens are currently listed for sale on minfind.com.

Localities for Axinite-(Fe)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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