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|Hardness:||6½ - 7|
|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).
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Classification of Axinite-(Mg)
|IMA status:||Approved 1975|
|Strunz 8th edition ID:||8/E.06-10|
|Nickel-Strunz 10th (pending) edition ID:||9.BD.20|
9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral  and greater coordination
|Dana 8th edition ID:||188.8.131.52|
56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in  and/or > coordination
|Hey's CIM Ref.:||17.5.29|
17 : Silicates Containing other Anions
5 : Borosilicates
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Type Occurrence of Axinite-(Mg)
|Type Locality:||Merelani Hills (Mererani), Lelatema Mts, Arusha Region, Tanzania|
|Year of Discovery:||1975|
Physical Properties of Axinite-(Mg)
|Hardness (Mohs):||6½ - 7|
Crystallography of Axinite-(Mg)
|Cell Parameters:||a = 8.93Å, b = 9.15Å, c = 7.12Å|
α = 102.59°, β = 98.28°, γ = 88.09°
|Ratio:||a:b:c = 0.976 : 1 : 0.778|
|Unit Cell Volume:||V 561.86 Å³ (Calculated from Unit Cell)|
Optical Data of Axinite-(Mg)
|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°|
|Maximum Birefringence:||δ = 0.009 - 0.011|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Axinite-(Mg)
|Essential elements:||Al, B, Ca, H, Mg, O, Si|
|All elements listed in formula:||Al, B, Ca, H, Mg, O, Si|
Relationship of Axinite-(Mg) to other Species
|Member of:||Axinite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Axinite-(Mg)
|Health Warning:||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)
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)
Localities for Axinite-(Mg)
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.