Riebeckit
Structural context
Riebeckite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/m
Chemical context
Stoichiometric formulas
Riebeckite
mindat.org
- March 13, 2023◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2Riebeckite is defined as a member of the riebeckite group with Fe2+>Mg in the C2+ position and (OH) dominant in the W position.
IMA
- March 13, 2023◻Na2(Fe2+3Fe3+2)Si8O22(OH)2
mineralogy.rocks
- Aug. 30, 2022[box]Na2(Fe2+3Fe3+2)Si8O22(OH)2
Physical properties
ColorColor entities, recognized using a custom trained NER model
- blue-black
- light blue
- gray-blue
- gray
Color noteOriginal color note from the source
Usually black, also commonly light blue to blue-black, gray-blue, gray, brown
StreakStreak entities, recognized using a custom trained NER model
- pale gray
- bluish-grey
Streak noteOriginal streak note from the source
Pale gray to bluish-grey.
Lustre
Vitreous
Sub-Vitreous
Fracture
Splintery
Transparency
Translucent
Opaque
Luminescence
Nonfluorescent
Tenacity
brittle
Hardness
5—5.5