Admontite

Admontite

General

Category
Nesoborates

Formula
(repeating unit)
MgB6O10·7H2O[1] or
MgB6O7(OH)6·4H2O[2]

Strunz classification
6.FA.15

Dana classification
26.6.3.1

Crystal system
Monoclinic

Crystal class
Prismatic (2/m)
(same H-M symbol)

Space group
P21/c

Identification

Color
colorless

Cleavage
Absent

Fracture
Conchoidal – Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz)

Mohs scale hardness
2 – 3 – Gypsum-Calcite

Streak
White

Density
1.82 – 1.87, Average = 1.84

Optical properties
Biaxial (-)

Refractive index
nα = 1.442 nγ = 1.504

Birefringence
δ = 0.062

Dispersion
None

References
[2][1][3]

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.
References[edit]

^ a b Handbook of Mineralogy
^ a b Mindat.org
^ Webmineral data

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