Constituent
- Name
- Larderellite
- IMA name
- Larderellite
- Class
- non-silicate mineral
- Compound type
- borate
- Comments
- also written as (NH4)B5O7(OH)2•H2O (MinDat)
- Relevance
- main - major
- Arrangement
- single phase
- Mass
- 0.267 $\pm$ 0.002 $g$
- Mass fraction
- 1.0
- Formula
- $(NH_4)B_5O_6(OH)_4$
- Chemical formula
- (NH4)B5O6(OH)4
- Elemental formula
- (N+) H8 B5 O6 (O-)4
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $B_{2}O_{3}$ $H_{2}O$ Mass fraction (%) 73.71 15.26 - Oxides comments
- N2O5 calculated as (NH4)2O = 11.03%
Strunz
- Class
- borates (06)
- Division
- pentaborates (06.E)
- Family
- Ino-pentaborates (06.EB)
- Code
- 06.EB.05
Dana
- Major class
- carbonates, nitrates, borates (V)
- Class
- hydrated borates containing hydroxyl or halogen (26)
- Type
- 26.05
- Group
- -Larderellite- group (26.05.04)
- Code
- 26.05.04.01
- Phase type
- crystalline
- Crystal system
- monoclinic
- Crystal class
- prismatic
- Crystal class symbol
- 2/m (C2h)
- Crystal spacegroup
- P2(1)/c
- Texture
- monocrystalline
- Molar mass
- 236.11 $g/mol$
- Density
- 1.905 $g/cm^3$
- Refringence type
- biaxial
- Refringence sign
- positive
- Birefringence
- 0.0520
- Refraction index $n_{\alpha}$
- 1.509
- Refraction index $n_{\beta}$
- 1.52
- Refraction index $n_{\gamma}$
- 1.561
- Dispersion V
- none
- Color
- yellowish, white
- Diaphaneity
- translucent