Formula: FeFe2(SO4)4.14H2O
Origin of name: for Friedrich A. Römer, German geologist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: clove-brown to yellow, violet-brown
Diaphaneity: translucent
Luster: vitreous, resinous or greasy
Habit: crystals thick tabular, cuboidal, form aggregates and crusts, granular, stalactitic
Hardness: 3 to 3.5
Specific gravity: 2.18
Cleavage: 2; {010} perfect, {001} distinct
Tenacity:
Streak:
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 |