Mexico, Saxony, Great Britain and Kongsberg, Norway are notable localities. Link to MinDat.org Location Data.
Name Origin:
After the Latin, argentum, meaning "silver". From the Greek, akanta, meaning "arrow." Argentite is stable above 179 C. Acanthite is stable below 179 C.
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Physical Properties of Argentite
Cleavage:
{001} Poor, {110} Poor
Color:
Black, Lead gray.
Density:
7.2 - 7.4, Average = 7.3
Diaphaneity:
Opaque
Fracture:
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Habit:
Arborescent - "Tree like" growths of branched systems (e.g. silver).
Habit:
Blocky - Crystal shape tends to be equant (e.g. feldspars).
Habit:
Skeletal - Crystals form crude outlines with missing faces.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
black
Calculated Properties of Argentite
Electron Density:
Bulk Density (Electron Density)=6.25 gm/cc note: Specific Gravity of Argentite =7.04 gm/cc.
Fermion Index:
Fermion Index = 0.0009705112 Boson Index = 0.9990294888
Photoelectric:
PEArgentite = 224.26 barns/electron U=PEArgentite x rElectron Density=1,401.66 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Argentite is Not Radioactive
Chemical Formula: 
