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Axinite-(Mg)

A valid IMA mineral species

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Photos of Axinite-(Mg) (26)

Axinite-(Mg) Gallery Search Photos of Axinite-(Mg)

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Axinite-(Mg)

Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania

Axinite-(Mg)

Luning area, Luning, Fitting Mining District, Mineral County, Nevada, USA

Axinite-(Mg)

Luning area, Luning, Fitting Mining District, Mineral County, Nevada, USA

Axinite-(Mg)

Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania

Axinite-(Mg)

Luning area, Luning, Fitting Mining District, Mineral County, Nevada, USA

Axinite-(Mg)

Luning area, Luning, Fitting Mining District, Mineral County, Nevada, USA

Axinite-(Mg)

Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania

Axinite-(Mg)

Luning area, Luning, Fitting Mining District, Mineral County, Nevada, USA

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About Axinite-(Mg)Hide

Formula:

Ca₂MgAl₂BSi₄O₁₅OH

Colour:

Colourless, pale blue, lavendar, pink, brown

Lustre:

Vitreous

Hardness:

6½ - 7

Specific Gravity:

3.16

Crystal System:

Triclinic

Member of:

Axinite Group

Name:

From the Greek αξίνα ("axina") for "axe", in allusion to the common habit of its crystals, and magnesium dominance in the formula.

Type Locality:

ⓘ Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania

Axinite Group. The magnesium analogue of Axinite-(Fe) and Axinite-(Mn).

Visit gemdat.org for gemological information about Axinite-(Mg).

Unique IdentifiersHide

Mindat ID:

2490

Long-form identifier:

mindat:1:1:2490:3

GUID
(UUID V4):

7c02da42-3d60-4cff-82cb-f28614e5736c

IMA Classification of Axinite-(Mg)Hide

IMA status:

Approved

IMA Formula:

Ca₄Mg₂Al₄[B₂Si₈O₃₀](OH)₂

Approval year:

1975

Classification of Axinite-(Mg)Hide

Strunz-mindat (2024):

9.BD.20

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

Dana 8th ed.:

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

Hey's CIM Ref.:

17.5.29

17 : Silicates Containing other Anions
5 : Borosilicates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference
Ax-Mg	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Ax	Kretz (1983)	Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279.
Ax	Siivolam & Schmid (2007)	Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download
Ax	Whitney & Evans (2010)	Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371

Pronunciation of Axinite-(Mg)Hide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of Axinite-(Mg)Hide

Lustre:

Vitreous

Transparency:

Transparent, Translucent

Colour:

Colourless, pale blue, lavendar, pink, brown

Streak:

White

Hardness:

6½ - 7 on Mohs scale

Density:

3.16(1) g/cm³ (Measured) 3.167 g/cm³ (Calculated)

Optical Data of Axinite-(Mg)Hide

Type:

Biaxial (-)

RI values:

n_α = 1.672 - 1.693 n_β = 1.677 - 1.701 n_γ = 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

Chemistry of Axinite-(Mg)Hide

Mindat Formula:

Ca₂MgAl₂BSi₄O₁₅OH

Elements listed:

Al, B, Ca, H, Mg, O, Si - search for minerals with similar chemistry

Common Impurities:

Ti,V,Mn,Zn,K,H₂O

Crystallography of Axinite-(Mg)Hide

Crystal System:

Triclinic

Class (H-M):

1 - Pinacoidal

Space Group:

Cell Parameters:

a = 7.1381(3) Å, b = 9.1626(4) Å, c = 8.9421(4) Å
α = 91.903(4)°, β = 98.105(3)°, γ = 77.468(4)°

Ratio:

a:b:c = 0.779 : 1 : 0.976

Unit Cell V:

565.21 Å³ (Calculated from Unit Cell)

Crystal StructureHide

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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

data_global
_chemical_name_mineral 'Axinite-(Mg)'
loop_
_publ_author_name
'Andreozzi G B'
'Lucchesi S'
'Graziani G'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 12 
_journal_year 2000
_journal_page_first 1185
_journal_page_last 1194
_publ_section_title
;
 Structural study of magnesioaxinite and its crystal-chemical relations
 with axinite-group minerals
;
_database_code_amcsd 0006850
_chemical_formula_sum 'Si4 B Al2 Mg.96 Mn.035 V.015 Cr.005 Ca1.975 O16 H.95'
_cell_length_a 7.1381
_cell_length_b 9.1626
_cell_length_c 8.9421
_cell_angle_alpha 91.903
_cell_angle_beta 98.105
_cell_angle_gamma 77.468
_cell_volume 565.206
_exptl_crystal_density_diffrn      3.170
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Si1   0.21090   0.44980   0.23102   1.00000   0.00400
Si2   0.21846   0.27405   0.52188   1.00000   0.00330
Si3   0.69967   0.25808   0.01122   1.00000   0.00410
Si4   0.64224   0.01769   0.23078   1.00000   0.00370
B   0.46270   0.63470   0.28590   1.00000   0.00490
Al1   0.05319   0.79946   0.25516   1.00000   0.00370
Al2   0.35128   0.93645   0.42062   1.00000   0.00400
Mg   0.76596   0.59547   0.11837   0.96000   0.00710
Mn   0.76596   0.59547   0.11837   0.02000   0.00710
V   0.76596   0.59547   0.11837   0.01500   0.00710
Cr   0.76596   0.59547   0.11837   0.00500   0.00710
Ca1   0.74552   0.34737   0.39304   1.00000   0.00740
Ca2   0.18237   0.10280   0.08373   0.97500   0.00820
Mn2   0.18237   0.10280   0.08373   0.01500   0.00820
O1   0.05080   0.60240   0.19240   1.00000   0.00520
O2   0.23420   0.34280   0.08930   1.00000   0.00690
O3   0.41900   0.48670   0.31150   1.00000   0.00530
O4   0.13870   0.36740   0.36550   1.00000   0.00910
O5   0.02070   0.24180   0.56180   1.00000   0.00510
O6   0.32290   0.38020   0.64620   1.00000   0.00500
O7   0.38170   0.12680   0.49680   1.00000   0.00470
O8   0.53330   0.34220   0.87670   1.00000   0.00500
O9   0.87730   0.15630   0.93280   1.00000   0.00500
O10   0.76860   0.37270   0.13550   1.00000   0.00710
O11   0.60910   0.13400   0.08880   1.00000   0.00850
O12   0.43470   0.98250   0.24300   1.00000   0.00490
O13   0.72200   0.09860   0.38470   1.00000   0.00480
O14   0.79290   0.86950   0.17870   1.00000   0.00610
O15   0.32550   0.74580   0.35500   1.00000   0.00410
O16   0.09580   0.99550   0.32170   1.00000   0.00470
H   0.98900   0.96100   0.61900   0.95000   0.00700

X-Ray Powder DiffractionHide

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

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])
Stage 4b: Highly evolved igneous rocks	>3.0
34 : Complex granite pegmatites

Type Occurrence of Axinite-(Mg)Hide

Type Locality:

ⓘ Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania

Synonyms of Axinite-(Mg)Hide

IMA1975-025

Magnesio-axinite

Magnesium Axinite

Other Language Names for Axinite-(Mg)Hide

Esperanto:Magnezioaksinito

German:Axinit-(Mg)
Magnesio-Axinit

Japanese:苦土斧石

Russian:Магнезиоаксинит
Аксинит-(Mg)

Relationship of Axinite-(Mg) to other SpeciesHide

Member of:

Axinite Group

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. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:

2 photos of Axinite-(Mg) associated with Graphite

Related Minerals - Strunz-mindat Grouping Hide

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 : Aba2
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. 1 : P1
9.BD.25	Vistepite	SnMn₄B₂Si₄O₁₆(OH)₂	Tric. 1 : P1
9.BD.30	Boralsilite	Al₁₆B₆O₃₀(Si₂O₇)	Mon. 2/m : B2/m
9.BD.35	Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇	Tric. 1 : P1
9.BD.40	Vránaite	Al₁₆B₄Si₄O₃₈	Mon. 2/m : B2/m

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.

Internet Links for Axinite-(Mg)Hide

mindat.org URL:

https://www.mindat.org/min-2490.html
Please feel free to link to this page.

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External Links:

Look for Axinite-(Mg) on Webmineral

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for Axinite-(Mg)Hide

Reference List:

American Mineralogist (1976): 61: 503-504.

Lumpkin, Gregory R., Ribbe, Paul H. (1979) Chemistry and physical properties of axinites. American Mineralogist, 64 (5-6) 635-645

Grew, Edward S., Anovitz, Lawrence M., Grew, Edward S., Anovitz, Lawrence M. - Eds. (1996) Boron - Mineralogy, Petrology and Geochemistry. Reviews in Mineralogy Vol. 33. Mineralogical Society of America

Salviulo, G., Andreozzi, G. B., & Graziani, G. (2000). X-ray characterization of Mg, Fe, and Mn natural end-members of the axinite group. Powder Diffraction, 15(3), 180-188.

(2023) Axinite-(Mg) Handbook of Mineralogy. Mineralogical Society of America

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Australia
New South Wales Murray Co. Queanbeyan Googong Dam ⓘ London Bridge	Leavens et al. (1980) +1 other reference
Tasmania West Coast municipality Zeehan mining district ⓘ Avebury Nickel Deposit (Avebury mine)	R Bottrill

Austria
Lower Austria Krems-Land District Spitz ⓘ Schwallenbach	Carinthia II (2002)

Czech Republic
South Moravian Region Blansko District ⓘ Lažany	Novák et al. (2002)
Vysočina Region Havlíčkův Brod District Golčův Jeníkov ⓘ Jezuitský rybník	Dolníček Z et al. (2020)

Japan
Nagano Prefecture Kashio ⓘ Kashio river	Matsubara et al. (2011)

Namibia
Erongo Region Dâures Constituency ⓘ Tubussis Farm 22	von Bezing (2007)

Russia
Chelyabinsk Oblast Satkinsky District ⓘ Bakal Fe deposit	Erokhin et al. (2007)

Spain
Andalusia Córdoba Adamuz ⓘ Loma del Enjambradero quarry	Calvo Rebollar (2018)

Sweden
Värmland County Filipstad ⓘ Nordmark Odal Field	Gatedal (2003)

Tanzania
ⓘ Arusha Region	Mineralogical Society of America - ...
Manyara Region Simanjiro District Lelatema Mountains ⓘ Merelani Hills (TL)	P Bongaerts collection +2 other references
ⓘ D-Block Mine	Photo ID: 379162

USA
California Butte County ⓘ Yankee Hill	Chris Stefano
Michigan Marquette County Marquette ⓘ Old airport	Heinrich et al. (2004)
Nevada Mineral County Fitting Mining District ⓘ Gillis Range	Rocks & Minerals
Luning ⓘ Luning area	Leavens et al. (1980)

Axinite-(Mg)

About Axinite-(Mg)Hide

Unique IdentifiersHide

IMA Classification of Axinite-(Mg)Hide

Classification of Axinite-(Mg)Hide

Mineral SymbolsHide

Pronunciation of Axinite-(Mg)Hide

Physical Properties of Axinite-(Mg)Hide

Optical Data of Axinite-(Mg)Hide

Chemistry of Axinite-(Mg)Hide

Crystallography of Axinite-(Mg)Hide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

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

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for Axinite-(Mg)Hide

References for Axinite-(Mg)Hide

Localities for Axinite-(Mg)Hide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide