Formula: (Zn,Fe)(Al,Fe)2(AsO4)(OH)
Origin of name: For Gerd Tremmel, German mineralogist
Crystal system: Triclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Yellow-brown to dark brown
Diaphaneity: Transparent
Luster: Adamantine
Habit: Spherulitic aggregates of tabular crystals to 3 µm
Hardness:
Specific gravity:
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Insoluble in HCl
| 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 |