Mineral phase
- IMA name
- Donpeacorite
- Class
- silicate mineral
- Compound type
- inosilicate
- Comments
- Donpeacorite: name by extension of (Fe,Mn,Mg)2Si2O6 in the range Fe=0-10%, Mn>10% - Mass, density and optical properties for Mn0.5Mg1.5.[SiO3]2 (x=0.5)
- Formula
- (Mn2+x,Mg1−x)Mg.[SiO3]2 where x=0−1
- Chemical formula
- (Mn2+,Mg)MgSi2O6
- Elemental formula
- (Mn2+)0-1 (Mg)1-2 Si2 O6
- Isotope mixture type
- terrestrial abundance
- Composition comments
- Common substitution: Fe2+ - Common impurities: Al, Fe3+, Ca, Na
- Oxides
-
Formula MnO MgO SiO2 Mass fraction (%) 23.78 22.52 53.71 - Oxides comments
- for Mn0.5Mg1.5.[SiO3]2 (x=0.5)
Strunz
- Class
- silicates (09)
- Division
- inosilicate (09.D)
- Family
- with 2-periodic single chains, Si2O6; pyroxene family (09.DA)
- Code
- 09.DA.05
Dana
- Major class
- silicates (VIII)
- Class
- inosilicate single-width unbranched chains, w=1 (65)
- Type
- with chains P=2 (65.01)
- Group
- Orthopyroxenes (65.01.02)
- Code
- 65.01.02.03
- Phase type
- crystalline
- Crystal system
- orthorhombic
- Crystal class
- dipyramidal
- Crystal class symbol
- mmm (D2h)
- Crystal spacegroup
- Pbca
- Molar mass
- 200.78 - 231.41 g/mol
- Density
- 3.36 g/cm3
- State NTP
- solid
- Refringence type
- biaxial
- Refringence sign
- negative
- Birefringence
- 0.015
- Refraction index nα
- 1.677
- Refraction index nβ
- 1.684
- Refraction index nγ
- 1.692
- Dispersion V
- weak
- Pure color
- yellow
- Color
- yellow-orange
- Diaphaneity
- transparent to translucent
- Luster
- vitreous