Formula: Pb2Cu(PO4)(SO4)(OH)
Origin of name: after locality Tsumeb, Namibia
Crystal system: monoclinic
Crystal class: 2/m
Twinning: universal on {-122} trillings
Unit cell: a = 8.69 Å, b = 5.78 Å, c = 7.86 Å, b = 111.9°
Colour: emerald green
Diaphaneity:
Luster: brilliant, vitreous
Habit: crystals thick tabular, always twinned, crusts
Hardness: 3.5
Specific gravity: 6.13
Cleavage: none
Tenacity: uneven, brittle
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 |