Constituent
- Name
- Nobleite
- IMA name
- Nobleite
- Class
- non-silicate mineral
- Compound type
- borate
- Relevance
- main - minor
- Arrangement
- in multi-phases
- Mass fraction
- 0.02 $\pm$ 0.2
- Formula
- $CaB_6O_9(OH)_2 \bullet 3(H_2O)$
- Chemical formula
- CaB6O9(OH)2•3(H2O)
- Elemental formula
- (Ca2+) B6 O12 H8 (O-)2
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $CaO$ $B_{2}O_{3}$ $H_{2}O$ Mass fraction (%) 16.64 61.98 21.38
Strunz
- Class
- borates (06)
- Division
- hexaborates (06.F)
- Family
- Phyllo-hexaborates (06.FC)
- Code
- 06.FC.05
Dana
- Major class
- carbonates, nitrates, borates (V)
- Class
- hydrated borates containing hydroxyl or halogen (26)
- Type
- 26.06
- Group
- -Nobleite- group (26.06.06)
- Code
- 26.06.06.01
- Phase type
- crystalline
- Crystal system
- monoclinic
- Crystal class
- prismatic
- Crystal class symbol
- 2/m (C2h)
- Crystal spacegroup
- P2(1)/c
- Molar mass
- 336.99 $g/mol$
- Density
- 2.09 $g/cm^3$
- Refringence type
- biaxial
- Refringence sign
- positive
- Birefringence
- 0.054
- Refraction index $n_{\alpha}$
- 1.5
- Refraction index $n_{\beta}$
- 1.52
- Refraction index $n_{\gamma}$
- 1.554
- Color
- colorless, white
- Diaphaneity
- transparent
- Luster
- vitreous