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Admontite

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Formula:
MgB6O10 · 7H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
2 - 3
Crystal System:
Monoclinic
Name:
Named after its discovery locality, at Schildmauer near Admont, Austria.
This page provides mineralogical data about Admontite.


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Classification of AdmontiteHide

Approved
Approval Year:
1978
First Published:
1979
6.FA.15

6 : BORATES
F : Hexaborates
A : Neso-hexaborates
26.6.3.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
9.2.13

9 : Borates
2 : Borates of Be and Mg

Physical Properties of AdmontiteHide

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

Optical Data of AdmontiteHide

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

Formula:
MgB6O10 · 7H2O

Crystallography of AdmontiteHide

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

Type Occurrence of AdmontiteHide

General Appearance of Type Material:
poorly developed or corroded crystals to ca. 1 mm; [001] elongation, {100} flattening
Geological Setting of Type Material:
In a gypsum deposit.
Associated Minerals at Type Locality:

Synonyms of AdmontiteHide

Other Language Names for AdmontiteHide

Dutch:Admontiet
German:Admontit
Italian:Admontite
Latvian:Admontīts
Spanish:Admontita

Related Minerals - Nickel-Strunz GroupingHide

6.FA.05AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
6.FA.10McallisteriteMg2[B6O7(OH)6]2 · 9H2OTrig. 3m (3 2/m) : R3c
6.FA.20RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
6.FA.25TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.2.1HambergiteBe2(BO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.2.2SuaniteMg2[B2O5]Mon.
9.2.3KotoiteMg3[BO3]2Orth. mmm (2/m 2/m 2/m) : Pnnm
9.2.4SzaibélyiteMgBO2(OH)Mon.
9.2.5PreobrazhenskiteMg3B11O15(OH)9Orth.
9.2.6AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
9.2.7WightmaniteMg5(BO3)O(OH)5 · 2H2OMon.
9.2.8PinnoiteMg[B2O(OH)6]Tet. 4/m : P42/m
9.2.9KurnakoviteMgB3O3(OH)5 · 5H2OTric. 1 : P1
9.2.10HalurgiteMg2[B4O7]2 · 5H2OMon.
9.2.11InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
9.2.12HungchaoiteMg(B4O7) · 9H2OTric. 1
9.2.14McallisteriteMg2[B6O7(OH)6]2 · 9H2OTrig. 3m (3 2/m) : R3c
9.2.15RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
9.2.16KaliboriteKMg2H[B6O8(OH)5]2(H2O)4Mon. 2/m : B2/b
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OHex.

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 AdmontiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Pabst, A. (1980) New mineral names. American Mineralogist: 65: 205.
Walenta, K. (1979) Admontit, ein neues Boratmineral aus der Gipslagerstätte Schildmauer bei Admont in der Steiermark (Österreich). Tschermaks Mineralogische und Petrographische Mitteilungen: 26: 69-77. [in German]
Walenta, K. (1982) Zum Chemismus von Admontit und Machatschkiit. Schweizerische Mineralogische und Petrographische Mitteilungen: 62: 177-83. [in German]
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for AdmontiteHide

Localities for AdmontiteHide

ⓘ - 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.
Austria (TL)
 
  • 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"
Mineral and/or Locality  
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