Mineral Information and Data:

Ardaite
Pb17Sb15S35Cl9 [CNMNC approved formula]

Named for the Arda River, Bulgaria, which runs through the Madjarovo deposit.

IMA status : Approved Species 1980 (IMA1979-073)
CLASSIFICATION 
Dana
(8th edition) :
02.15.01.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.15) (Chlorides)
  (02.15.01)
  
Nickel-Strunz
(10th edition) :
02.LB.20
  (02) Sulfides
  (02.L) Unclassified Sulfosalts
  (02.LB) With essential Pb
  
Crystal system: Monoclinic System
Point group (H-M): Unknown — Unk
Unit cell: a = 22.09Å, b = 21.11Å, c = 8.05Å β = 103°
Crystal Habit: Microscopic aggregates of acicular crystals
  
Color: In reflected light greenish grey or bluish green
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2.5 - 3
Measured Density: 6.17 g/cm3
  
Geologic Setting: Very rare in polymetallic ore deposits.
Mineral Association: Galena, nadorite, chlorian robinsonite, chlorian semseyite, pyrostilpnite, argentian tetrahedrite, anglesite (Madjarovo, Bulgaria); sphalerite, pyrrhotite, chalcopyrite, magnetite, scheelite, stannite, pyrargyrite, silver, antimony, arsenopyrite, nisbite, graphite (Gruvasen, Sweden)
  
Synonyms/varieties: IMA1979-073

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