Constituent
- Name
- rhonite
- IMA name
- Rhonite
- Class
- silicate mineral
- Compound type
- inosilicate
- Relevance
- main - major
- Arrangement
- heterogeneous in multi-phases
- Formula
- $Ca_2(Mg,Fe^{2+},Fe^{3+},Ti)_6(Si,Al)_6O_{20}$
- Chemical formula
- Ca2(Mg,Fe2+,Fe3+,Ti)6(Si,Al)6O20
- Elemental formula
- (Ca)1-2 (Mg)2-4 (Fe2+)0-2 (Fe3+)0-2 (Al)1-3 (Ti)0-1 (Si)3-5 O20
- Isotope mixture type
- terrestrial abundance
- Composition comments
- Proportions are very various. Common impurities: K, Na, Mn
- Oxides
-
Formula $K_{2}O$ $Na_{2}O$ $CaO$ $MgO$ $TiO_{2}$ $Al_{2}O_{3}$ $FeO$ $Fe_{2}O_{3}$ $SiO_{2}$ Mass fraction (%)
Strunz
- Class
- silicates (09)
- Division
- inosilicate (09.D)
- Family
- with 4-periodic single chains, Si4O12 (09.DH)
- Code
- 09.DH.45
Dana
- Major class
- silicates (VIII)
- Class
- inosilicate chains with side branches or loops (69)
- Type
- with P>2 (69.02)
- Group
- Aenigmatite and related species (Aenigmatite subgroup) (69.02.01a)
- Code
- 69.02.01a.05
- Phase type
- crystalline
- Crystal system
- triclinic
- Crystal class
- pinacoidal
- Crystal class symbol
- -1 (Ci)
- Crystal spacegroup
- P1
- Texture
- monocrystalline
- Molar mass
- 814.43 $g/mol$
- Density
- 3.4 - 3.76 $g/cm^3$
- Refringence type
- biaxial
- Refringence sign
- positive
- Birefringence
- 0.0350
- Refraction index $n_{\alpha}$
- 1.795 - 1.81
- Refraction index $n_{\beta}$
- 1.806 - 1.825
- Refraction index $n_{\gamma}$
- 1.83 - 1.845
- Dispersion V
- r > v extreme
- Color
- brown, black
- Diaphaneity
- translucent to opaque
- Luster
- submetallic