Admontite
General
CategoryNesoborates
Formula
(repeating unit)
MgB6O10·7H2O[1] or
MgB6O7(OH)6·4H2O[2]
IMA symbolAmt[3]
Strunz classification6.FA.15
Dana classification26.6.3.1
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/c
Identification
Colorcolorless
CleavageAbsent
FractureConchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz)
Mohs scale hardness2 - 3 - Gypsum-Calcite
StreakWhite
Density1.82 - 1.87, Average = 1.84
Optical propertiesBiaxial (-)
Refractive indexnα = 1.442 nγ = 1.504
Birefringenceδ = 0.062
DispersionNone
References[2][1][4]

Admontite is a hydrated magnesium borate mineral with formula MgB6O10·7H2O.

Occurrence - In a gypsum deposit. Associations: gypsum, anhydrite, hexahydrite, löweite, eugsterite, pyrite, quartz.

It is named after Admont, Austria. Its Mohs scale rating is 2 to 3.

See also

References

  1. 1 2 Handbook of Mineralogy
  2. 1 2 Mindat.org
  3. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  4. Webmineral data


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