Axinite-(Mg)
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About Axinite-(Mg)
Formula:
Ca2MgAl2BSi4O15OH
Colour:
Pale blue
Lustre:
Vitreous
Hardness:
6½ - 7
Crystal System:
Triclinic
Member of:
Name:
From the Greek αξίνα ("axina") for "axe", in allusion to the common habit of its crystals, and magnesium dominance in the formula.
Axinite Group. The magnesium analogue of Axinite-(Fe) and Axinite-(Mn).
Visit gemdat.org for gemological information about Axinite-(Mg).
Visit gemdat.org for gemological information about Axinite-(Mg).
Classification of Axinite-(Mg)
Approved
Approval year:
1975
8/E.06-10
9.BD.20
9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
56.2.2.2
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
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
17.5.29
17 : Silicates Containing other Anions
5 : Borosilicates
17 : Silicates Containing other Anions
5 : Borosilicates
Pronounciation of Axinite-(Mg)
Pronounciation:
Play | Recorded by | Country |
---|---|---|
Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Axinite-(Mg)
Optical Data of Axinite-(Mg)
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong
Chemical Properties of Axinite-(Mg)
Formula:
Ca2MgAl2BSi4O15OH
IMA Formula:
Ca4Mg2Al4[B2Si8O30](OH)2
Common Impurities:
Ti,V,Mn,Zn,K,H2O
Crystallography of Axinite-(Mg)
Crystal System:
Triclinic
Cell Parameters:
a = 8.93 Å, b = 9.15 Å, c = 7.12 Å
α = 102.59°, β = 98.28°, γ = 88.09°
α = 102.59°, β = 98.28°, γ = 88.09°
Ratio:
a:b:c = 0.976 : 1 : 0.778
Unit Cell V:
561.86 ų (Calculated from Unit Cell)
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0006850 | Axinite-(Mg) | Andreozzi G B, Lucchesi S, Graziani G (2000) Structural study of magnesioaxinite and its crystal-chemical relations with axinite-group minerals European Journal of Mineralogy 12 1185-1194 | 2000 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.95 Å | (15) |
6.29 Å | (25) |
4.96 Å | (4) |
4.76 Å | (8) |
4.61 Å | (2) |
3.97 Å | (10) |
3.66 Å | (5) |
3.44 Å | (65) |
3.27 Å | (20) |
3.14 Å | (65) |
3.07 Å | (8) |
2.985 Å | (20b) |
2.877 Å | (20) |
2.796 Å | (100) |
2.753 Å | (5b) |
2.633 Å | (5) |
2.556 Å | (25) |
2.429 Å | (18) |
2.415 Å | (18) |
2.452 Å | (8) |
2.305 Å | (1) |
2.252 Å | (1) |
2.176 Å | (30) |
2.150 Å | (30) |
2.121 Å | (4) |
2.048 Å | (14) |
2.028 Å | (14) |
Comments:
ICDD 29-344, natural material, Tanzania
Type Occurrence of Axinite-(Mg)
Synonyms of Axinite-(Mg)
Other Language Names for Axinite-(Mg)
Esperanto:Magnezioaksinito
German:Axinit-(Mg)
Magnesio-Axinit
Magnesio-Axinit
Japanese:苦土斧石
Russian:Магнезиоаксинит
Аксинит-(Mg)
Аксинит-(Mg)
Relationship of Axinite-(Mg) to other Species
Member of:
Other Members of this group:
Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH | Tric. 1 : P1 |
Axinite-(Mn) | Ca2Mn2+Al2BSi4O15(OH) | Tric. 1 : P1 |
Tinzenite | Ca2Mn2+4Al4[B2Si8O30](OH)2 | Tric. |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
9.BD.05 | Bertrandite | Be4(Si2O7)(OH)2 | Orth. mm2 : Cmc21 |
9.BD.10 | Hemimorphite | Zn4Si2O7(OH)2 · H2O | Orth. mm2 : Imm2 |
9.BD.15 | Junitoite | CaZn2Si2O7 · H2O | Orth. mm2 |
9.BD.20 | Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH | Tric. 1 : P1 |
9.BD.20 | Axinite-(Mn) | Ca2Mn2+Al2BSi4O15(OH) | Tric. 1 : P1 |
9.BD.20 | Tinzenite | Ca2Mn2+4Al4[B2Si8O30](OH)2 | Tric. |
9.BD.25 | Vistepite | SnMn4B2Si4O16(OH)2 | Tric. 1 |
9.BD.30 | Boralsilite | Al16B6O30(Si2O7) | Mon. 2/m : B2/m |
9.BD.35 | Werdingite | (Mg,Fe)2Al14Si4B4O37 | Tric. |
Related Minerals - Dana Grouping (8th Ed.)
56.2.2.1 | Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH | Tric. 1 : P1 |
56.2.2.3 | Axinite-(Mn) | Ca2Mn2+Al2BSi4O15(OH) | Tric. 1 : P1 |
56.2.2.4 | Tinzenite | Ca2Mn2+4Al4[B2Si8O30](OH)2 | Tric. |
Related Minerals - Hey's Chemical Index of Minerals Grouping
17.5.1 | Manandonite | Li2Al4(Si2AlB)O10(OH)8 | Orth. |
17.5.2 | Reedmergnerite | NaBSi3O8 | Tric. |
17.5.3 | Searlesite | Na(H2BSi2O7) | Mon. 2 : P21 |
17.5.4 | Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. 3m : R3m |
17.5.5 | Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
17.5.6 | Kalborsite | K6Al4BSi6O20(OH)4Cl | Tet. |
17.5.7 | Boromuscovite | KAl2(BSi3O10)(OH)2 | Mon. |
17.5.8 | Poudretteite | KNa2B3Si12O30 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
17.5.9 | Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
17.5.10 | Datolite | CaB(SiO4)(OH) | Mon. 2/m : P21/b |
17.5.11 | Danburite | CaB2Si2O8 | Orth. mmm (2/m 2/m 2/m) |
17.5.12 | Howlite | Ca2B5SiO9(OH)5 | Mon. 2/m : P21/b |
17.5.13 | Bakerite | Ca4(H5B5Si3O20) | Mon. 2/m : P21/b |
17.5.14 | Oyelite | Ca10Si8B2O29 · 12.5H2O | Orth. |
17.5.15 | Kornerupine | Mg3Al6(Si,Al,B)5O21(OH) | Orth. mmm (2/m 2/m 2/m) |
17.5.16 | Harkerite | Ca12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O | Trig. 3m (3 2/m) : R3m |
17.5.17 | Serendibite | Ca4[Mg6Al6]O4[Si6B3Al3O36] | Tric. 1 : P1 |
17.5.18 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 | Trig. 3 : P31 |
17.5.19 | Tadzhikite-(Ce) | Ca4Ce3+2Ti◻(B4Si4O22)(OH)2 | Mon. |
17.5.20 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,0) | Hex. |
17.5.21 | Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 | Trig. 3m : R3m |
17.5.22 | Tritomite-(Ce) | Ce5(SiO4,BO4)3(OH,O) | |
17.5.23 | Tritomite-(Y) | Y5(SiO4,BO4)3(O,OH,F) | |
17.5.24 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 | Trig. 3 : P3 |
17.5.25 | Dumortierite | (Al,Fe3+)7(SiO4)3(BO3)O3 | Orth. mmm (2/m 2/m 2/m) |
17.5.26 | Holtite | (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 | Orth. mmm (2/m 2/m 2/m) : Pnma |
17.5.27 | Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
17.5.28 | Ferridravite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | |
17.5.30 | Fluor-uvite-Uvite Series | ||
17.5.31 | Garrelsite | Ba3NaSi2B7O16(OH)4 | Mon. |
17.5.32 | Tienshanite | KNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11 | Hex. 6/m : P6/m |
17.5.33 | Leucosphenite | BaNa4Ti2B2Si10O30 | Mon. |
17.5.34 | Taramellite | Ba4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx | Orth. mmm (2/m 2/m 2/m) : Pmmn |
17.5.35 | Titantaramellite | Ba4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx | Orth. |
17.5.36 | Nagashimalite | Ba4(V,Ti)4B2Si8O27(O,OH)2Cl | Orth. mmm (2/m 2/m 2/m) : Pmmn |
17.5.37 | Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
17.5.38 | Wawayandaite | Ca6Mn2BBe9Si6O23(OH,Cl)15 | Mon. |
17.5.39 | Werdingite | (Mg,Fe)2Al14Si4B4O37 | Tric. |
17.5.40 | Axinite-(Mn) | Ca2Mn2+Al2BSi4O15(OH) | Tric. 1 : P1 |
17.5.41 | Axinite | Tric. | |
17.5.42 | Tinzenite | Ca2Mn2+4Al4[B2Si8O30](OH)2 | Tric. |
17.5.44 | Schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
17.5.45 | Fluor-buergerite | Na(Fe3+3)Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
17.5.46 | Feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
17.5.47 | Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH | Tric. 1 : P1 |
17.5.48 | Homilite | Ca2(Fe2+,Mg)B2Si2O10 | Mon. 2/m : P21/b |
17.5.49 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 | Orth. mmm (2/m 2/m 2/m) |
17.5.50 | Hyalotekite | (Ba,Pb,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl) | Tric. 1 : P1 |
17.5.51 | Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 | Mon. |
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-(Mg)
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1976): 61: 503-504.
American Mineralogist (1979): 64: 635-645.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Internet Links for Axinite-(Mg)
mindat.org URL:
https://www.mindat.org/min-2490.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Axinite-(Mg)
Locality List




All localities listed without proper references should be considered as questionable.
Australia | |
| [MinRec 11:13; DHZ Rock-forming minerals 2nd ed. vol. 1B (1986), p.608] |
| R Bottrill, unpub data |
Austria | |
| Carinthia II, 192./112. (2002) 215-244 |
Namibia | |
| Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. 331 (in English). |
Russia | |
| Erokhin, Y.V., and Shagalov, E.S. (2007): RMS Annual Session, Moscow (Russia), 8-10 October 2007. |
Spain | |
| Calvo Rebollar, Miguel. (2018). Minerales y Minas de España. Vol. IX. Silicatos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 767 págs. |
Sweden | |
| |
Tanzania | |
Handbook of Mineralogy | |
| P Bongaerts collection; Mineralogical Record (2009) 40: 347-408; Jaszczak, John (2014), Mineralogical Miracles at Merelani, presentation to the 41st. Rochester Mineralogical Symposium, April 25, 2014. |
Van King | |
USA | |
| Chris Stefano |
| Mineralogy of Michigan (2004) Heinrich & Robinson |
| Rocks & Minerals, Nov. 1999 |
| [MinRec 11:13-14] |
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Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania