Constituent
- Name
- Pinnoite
- IMA name
- Pinnoite
- Class
- non-silicate mineral
- Compound type
- borate
- Relevance
- main - major
- Arrangement
- in multi-phases
- Mass fraction
- 0.46 $\pm$ 0.1
- Formula
- $MgB_2O_4 \bullet 3(H_2O)$
- Chemical formula
- MgB2O4•3(H2O)
- Elemental formula
- Mg B2 O7 H6
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $MgO$ $B_{2}O_{3}$ $H_{2}O$ Mass fraction (%) 24.58 42.46 32.96
Strunz
- Class
- borates (06)
- Division
- diborates (06.B)
- Family
- Neso-diborates with double tetrahedra B2O(OH)6; 2(2T) (06.BB)
- Code
- 06.BB.05
Dana
- Major class
- carbonates, nitrates, borates (V)
- Class
- anhydrous borates containing hydroxyl or halogen (25)
- Type
- 25.02
- Group
- -Pinnoite- group (25.02.03)
- Code
- 25.02.03.01
- Phase type
- crystalline
- Crystal system
- tetragonal
- Crystal class
- pyramidal
- Crystal class symbol
- 4 (C4)
- Crystal spacegroup
- P4(2)
- Molar mass
- 163.97 $g/mol$
- Density
- 2.29 $g/cm^3$
- Refringence type
- uniaxial
- Refringence sign
- positive
- Birefringence
- 0.010
- Refraction index $n_{\alpha}$
- 1.565
- Refraction index $n_{\beta}$
- 1.575
- Color
- colorless, yellow, yellow green, light yellow
- Diaphaneity
- translucent
- Luster
- vitreous