Solid phase
- Official name
- Chromium hydroxide oxide
- Secondary names
- Cr(OH)O; gGimaldiite
- CAS number
- 20770-05-2
- Family
- covalent network solid
- Class
- tridimentional covalent network solid
- Compound type
- oxide-hydroxide
- Formula
- Cr2O3
- Chemical formula
- Cr(OH)O
- Elemental formula
- Cr O2 H
- Isotope mixture type
- terrestrial abundance
- Class
- sheet covalent networks (10)
- Type
- one metal and one non-metal atoms sheet networks (10.04)
- Equivalent mineral
- Grimaldiite
- Phase name
- alpha-CrOOH
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- ditrigonal-scalenohedral
- Crystal class symbol
- -3m (D3d)
- Crystal spacegroup
- R-3m
- Comments
- Layer crystal structure, where close-packed CrO,-octahedra are held together by short hydrogen bonds.
- Molar mass
- 85.00 g/mol
- Density
- 4.11 g/cm3
- State NTP
- solid
- Refringence type
- uniaxial
- Refringence sign
- negative
- Birefringence
- 0.18
- Refraction index nα
- 2.155
- Refraction index nβ
- 1.975
- Pure color
- red
- Color
- dark red
- Diaphaneity
- opaque
- Luster
- metallic