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Admontite

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Formula:
Mg[B
 
6
O
 
7
(OH)
 
6
] · 4H
 
2
O
System:MonoclinicColour:Colourless
Hardness:2 - 3
Name:Named after its discovery locality, at Schildmauer near Admont, Austria.
This page provides mineralogical data about Admontite.

Classification of Admontite

IMA status:Approved 1978
Strunz 8th edition ID:5/H.17-10
Strunz 9th edition ID:6.FA.15
Nickel-Strunz 10th (pending) edition ID:6.FA.15

6 : BORATES
F : Hexaborates
A : Neso-hexaborates
Dana 8th edition ID:26.6.3.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
Hey's CIM Ref.:9.2.13

9 : Borates
2 : Borates of Be and Mg
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Type Occurrence of Admontite

Type Locality:Schildmauer, Admont, Ennstaler Alpen, Styria, Austria
Year of Discovery:1978
Geological Setting of type material:In a gypsum deposit.
Associated Minerals at type locality:
QuartzPyriteLöweiteHexahydriteGypsum
EugsteriteAnhydrite

Physical Properties of Admontite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless
Streak:White
Hardness (Mohs):2 - 3
Comment:Slowly decomposed in H2O.
Cleavage:None Observed
Fracture:Conchoidal

Crystallography of Admontite

Crystal System:Monoclinic
Morphology:Crystals are poorly developed or corroded, to about 1 mm, elongated along [001], flattened parallel to {100}.

Optical Data of Admontite

Type:Biaxial (-)
RI values: nα = 1.442 nγ = 1.504
Maximum Birefringence:δ = 0.062

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:not observed

Chemical Properties of Admontite

Formula:
Mg[B
 
6
O
 
7
(OH)
 
6
] · 4H
 
2
O
Essential elements:B, H, Mg, O
All elements listed in formula:B, H, Mg, O

Relationship of Admontite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.FA.05Aksaite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 2H
 
2
O
6.FA.10Mcallisterite
Mg
 
2
[B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 9H
 
2
O
6.FA.20Rivadavite
Na
 
6
Mg[B
 
6
O
 
7
(OH)
 
6
]
 
4
 · 10H
 
2
O
6.FA.25Teruggite
Ca
 
4
Mg[AsO
 
4
|B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 12H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
9.2.1Hambergite
Be
 
2
(BO
 
3
)(OH)
9.2.2Suanite
Mg
 
2
[B
 
2
O
 
5
]
9.2.3Kotoite
Mg
 
3
[BO
 
3
]
 
2
9.2.4Szaibélyite
Mg
 
2
[(OH)(B
 
2
O
 
4
(OH))]
9.2.5Preobrazhenskite
Mg
 
3
B
 
11
O
 
15
(OH)
 
9
9.2.6Aksaite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 2H
 
2
O
9.2.7Wightmanite
Mg
 
5
(BO
 
3
)O(OH)
 
5
 · 2H
 
2
O
9.2.8Pinnoite
Mg[B
 
2
O(OH)
 
6
]
9.2.9Kurnakovite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.10Halurgite
Mg
 
2
[B
 
4
O
 
7
]
 
2
 · 5H
 
2
O
9.2.11Inderite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.12Hungchaoite
Mg(B
 
4
O
 
7
) · 9H
 
2
O
9.2.14Mcallisterite
Mg
 
2
[B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 9H
 
2
O
9.2.15Rivadavite
Na
 
6
Mg[B
 
6
O
 
7
(OH)
 
6
]
 
4
 · 10H
 
2
O
9.2.16Kaliborite
KMg
 
2
H[B
 
6
O
 
8
(OH)
 
5
]
 
2
(H
 
2
O)
 
4
9.2.17Iquiqueite
K
 
3
Na
 
4
Mg(CrO
 
4
)B
 
24
O
 
39
(OH) · 12H
 
2
O

Other Names for Admontite

Synonyms:
IMA1978-012
Other Languages:
Dutch:Admontiet
German:Admontit
Italian:Admontite
Latvian:Admontīts
Russian:Адмонтит
Spanish:Admontita

Other Information

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 Admontite

Reference List:

- +
Dal Negro, A., Ungaretti, L. & Basso, R. (1976) The crystal structure of synthetic hydrated borates: (II) MgO*3B2O3*7H2O. Crystal Structure Communications 5, 433-436.

American Mineralogist: 65: 205.

Walenta, K. (1979) Admontit, ein neues Boratmineral aus der Gipslagerstätte Schildmauer bei Admont in der Steiermark (Österreich). Tschermaks. Mineral. Petr. Mitt. 26, 69-77. (in German).

Walenta, K. (1982) Zum Chemismus von Admontit und Machatschkiit. Schweiz. Mineral. Petrogr. Mitt. 62, 177-83. (in German)

Internet Links for Admontite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Admontite details from Handbook of Mineralogy (PDF)
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    • Localities for Admontite

    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.
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    (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.
    Austria
     
    • Styria
      • Ennstaler Alpen
        • Admont
    		Walenta, K. (1979): Admontit, ein neues Boratmineral aus der Gipslagerstätte Schildmauer bei Admont in der Steiermark (Österreich). Tschermaks. Mineral. Petr. Mitt. 26, 69-77. (in German) ; Schweiz. Min. Petr. Mitt. 62 (1982), 177; Clark, 1993 - "Hey's Mineral Index, 3rd Edition"
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