Mineral Information and Data:

Silver
Ag [CNMNC approved formula]

Named from the Old English "seolfor", original meaning lost; Latin "argentum", silver.

IMA status : Valid species (Pre-IMA Ancient) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
01.01.01.02  
  (01) Native Elements
  (01.01) with metallic elements other than the platinum group
  (01.01.01) Gold group
  
Nickel-Strunz
(10th edition) :
01.AA.05
  (01) Elements
  (01.A) Metals and Intermetallic Alloys
  (01.AA) Copper-cupalite family
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
Unit cell: a = 4.0862Å
Crystal Habit: Crystals cubic, octahedral, dodecahedral, in parallel groups, elongated, arborescent, reticulated and as wires, massive
Twinning: On {111} as simple pairs and repeated in aggregates radiating along [111] axes.
  
Color: Silver-white, tarnishes dark gray to black
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2.5 to 3
Measured Density: 10.50 g/cm3
Tenacity: Ductile, malleable
Fracture: Hackly
Streak: Silver-white
  
Polymorphism and Series: Forms a series with gold.
Polytypes: cubic form is 3C; hexagonal stacking 2H and 4H
Geologic Setting: A primary hydrothermal mineral, also formed by secondary processes, especially in the oxidized portions of mineral deposits.
Found in : 1) Primary Hydrothermal veins, 2) Secondary enrichment, and 3) Alluvial nuggets
Mineral Association: Acanthite, chlorargyrite, embolite, silver sulfosalts, gold, copper
  
Synonyms/varieties: Kongsbergite (Hg-rich variety), küstelite (Au-rich variety)

 

Silver
Origin: kongsberg, Norway
Picture height: 10 mm
Sample owner: H. Drost
Photo: Pieter Stemvers, Leusden, Netherlands

 

Silver
Arborescent habit silver crystals etched out of calcite
Origin: Kongsberg, Norway
Sample size: 3 x 3 x 1 cm
Photo: Tom Loomis

 

Silver
(zoom-in of above)

 

Silver
Thick wire silver to 3 mm throughout black acanthite matrix.
Origin: Tegucigalpa, Honduras
Sample size: 3 x 3 x 2.5 cm
Photo: Tom Loomis

 

Silver
(zoom-in of above)

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