Formula: (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 . 11H2O
Origin of name: For Richard Eggleton, Australian mineralogist
Crystal system: Monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: Dark brown to golden brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals prismatic, acicular to 1.5 mm long, in radiating groups
Hardness: 3 to 4
Specific gravity: 2.76
Cleavage: 1; {001} perfect
Tenacity:
Streak: Light brown
Synonyms/varieties:
Comments:
| Back to Alphabetical list | Colour photos | Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |