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Axinite-(Mg)

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About Axinite-(Mg)Hide

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).


Classification of Axinite-(Mg)Hide

Approved
Approval Year:
1975
9.BD.20

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
17.5.29

17 : Silicates Containing other Anions
5 : Borosilicates

Pronounciation of Axinite-(Mg)Hide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of Axinite-(Mg)Hide

Vitreous
Colour:
Pale blue
Streak:
White
Hardness:
6½ - 7 on Mohs scale

Optical Data of Axinite-(Mg)Hide

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-(Mg)Hide

Formula:
Ca2MgAl2BSi4O15OH
IMA Formula:
Ca4Mg2Al4[B2Si8O30](OH)2
Common Impurities:
Ti,V,Mn,Zn,K,H2O

Crystallography of Axinite-(Mg)Hide

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°
Ratio:
a:b:c = 0.976 : 1 : 0.778
Unit Cell V:
561.86 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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)Hide

Synonyms of Axinite-(Mg)Hide

Other Language Names for Axinite-(Mg)Hide

Relationship of Axinite-(Mg) to other SpeciesHide

Member of:
Other Members of this group:
Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Axinite-(Mg) associated with LeadPb
4 photos of Axinite-(Mg) associated with AndraditeCa3Fe3+2(SiO4)3
4 photos of Axinite-(Mg) associated with RhodoniteMn2+SiO3

Related Minerals - Nickel-Strunz GroupingHide

9.BD.05BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
9.BD.10HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
9.BD.15JunitoiteCaZn2Si2O7 · H2OOrth. mm2
9.BD.20Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
9.BD.20Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
9.BD.20TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
9.BD.25VistepiteSnMn4B2Si4O16(OH)2Tric. 1
9.BD.30BoralsiliteAl16B6Si2O37Mon. 2/m : B2/m
9.BD.35Werdingite(Mg,Fe)2Al14Si4B4O37Tric.

Related Minerals - Dana Grouping (8th Ed.)Hide

56.2.2.1Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
56.2.2.3Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
56.2.2.4TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
17.5.2ReedmergneriteNaBSi3O8Tric.
17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.6KalborsiteK6Al4BSi6O20(OH)4ClTet.
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2Mon.
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.10DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5Trig. 3 : P31
17.5.19Tadzhikite-(Ce)Ca4Ce3+2Ti◻(B4Si4O22)(OH)2Mon.
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m : R3m
17.5.22Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.23Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.30Fluor-uvite-Uvite Series
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4Mon.
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.33LeucospheniteBaNa4Ti2B2Si10O30Mon.
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2ClxOrth.
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.37Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37Tric.
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.41AxiniteTric.
17.5.42TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10Mon. 2/m : P21/b
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Ba,Pb,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

Other InformationHide

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)Hide

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)Hide

Localities for Axinite-(Mg)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Murray Co.
      • Queanbeyan
        • Googong Dam
[MinRec 11:13; DHZ Rock-forming minerals 2nd ed. vol. 1B (1986), p.608]
  • Tasmania
    • West Coast municipality
      • Zeehan district
R Bottrill, unpub data
Austria
 
  • Lower Austria
    • Krems-Land District
      • Spitz
Carinthia II, 192./112. (2002) 215-244
Namibia
 
  • Erongo Region
    • Dâures
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. 331 (in English).
Russia
 
  • Chelyabinsk Oblast
    • Satkinsky District
Erokhin, Y.V., and Shagalov, E.S. (2007): RMS Annual Session, Moscow (Russia), 8-10 October 2007.
Spain
 
  • Andalusia
    • Córdoba
      • Adamuz
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
 
  • Värmland County
    • Filipstad
Tanzania
 
Handbook of Mineralogy
  • Manyara Region
    • Simanjiro District
      • Lelatema Mountains
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
 
  • California
    • Butte Co.
Chris Stefano
  • Michigan
    • Marquette Co.
      • Marquette
Mineralogy of Michigan (2004) Heinrich & Robinson
  • Nevada
    • Mineral Co.
      • Fitting Mining District
Rocks & Minerals, Nov. 1999
[MinRec 11:13-14]
 
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