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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 Mts, Styria, Austria
Year of Discovery:1979
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: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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    • Localities for Admontite

    Hide Locality List
    (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 Mts
        • 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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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 07:42:26
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