Formula: (Cu,Ag)21As10
Origin of name: for Jiri Novak, Czech mineralogist
Crystal system: monoclinic, pseudotetragonal
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: steel-gray, rapidly tarnishes iridescent, then black
Diaphaneity: opaque
Luster: metallic
Habit: grains to 3 cm, irregular aggregates
Hardness: 3 to 3.5
Specific gravity: 6.7
Cleavage: none
Tenacity:
Streak: black
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 |