Formula: Na2Fe4Fe2Si6O20
Origin of name: for John Frederick George Wilkinson (1927-), professor of geology, University of New England, Australia
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 10.355, b = 10.812, c = 8.906, α = 105.05°, β = 96.63°, γ = 125.2°
Colour: Black
Diaphaneity: Subtransparent to opaque
Luster: Vitreous
Habit: Anhedral grains
Hardness: 5
Specific gravity: 3.89
Cleavage: none
Tenacity: Brittle, conchoidal fracture
Streak: Brown
Synonyms/varieties:
Comments:
| Back to Alphabetical list | Colour photos | Optical properties/Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |