Ardaite

Ardaite

Ardaite associated with galenite, Madjarovo polymetallic ore deposit, National Natural History Museum, Sofia, Bulgaria
General
Category Sulfosalt minerals, Lead minerals
Formula
(repeating unit)		 Pb19Sb13S35Cl7
Strunz classification 2.LB.30 (10 ed)
2/E.19-20 (8 ed)
Dana classification 02.15.01.01
Crystal system Monoclinic
Unknown space group
Identification
Color Greenish gray or bluish green
Mohs scale hardness 2.5-3
Luster Metallic
Density 6.44
Pleochroism Weak
References Breskovska V. V., N. N. Mozgova, N. S. Bortnikov, A. I. Gorshkov, A. I. Tzepin (1982): Ardaite, a new lead-antimony chlorsulphosalt. Mineral. Mag., 46, 357-361.

Ardaite is a very rare sulfosalt mineral with chemical formula Pb19Sb13S35Cl7 in the monoclinic crystal system,[1][2] named after the Arda river, which passes through the type locality.[3] It was discovered in 1978 and approved by the International Mineralogical Association in 1980.[4][5][6] It was the second well-defined natural chlorosulfosalt, after dadsonite.[7]

Greenish gray or bluish green in color, its luster is metallic. Ardaite occurs as 50 µm fine-grained aggregates of acicular crystals associated with galena, pyrostilpnite, anglesite, nadorite, and Cl-bearing robinsonite and semseyite, in the Madjarovo polymetallic ore deposit in Bulgaria. Ardaite has a hardness of 2.5 to 3 on Mohs scale and a density of approximately 6.44.[1]

The type locality is the Madjarovo polymetallic ore deposit in the Rhodope mountains.[8][9] Later its occurrence was proved in the Gruvåsen deposit, near Filipstad, Bergslagen, Sweden.[5]

References

  1. 1 2 Mindat information page for Ardaite
  2. ↑ Webmineral information page for Ardaite
  3. ↑ Handbook of Mineralogy information page for Ardaite
  4. ↑ Breskovska V. V., N. N. Mozgova, N. S. Bortnikov, A. I. Gorshkov, A. I. Tzepin (1982): Ardaite, a new lead-antimony chlorsulphosalt. Mineral. Mag., 46, 357-361.
  5. 1 2 E.A.J. Burke, C. Kieft, M.A. Zakrzewski (1981), The Second Occurrence of Ardaite, Canadian Mineralogist, vol. 19, pp. 419–422.
  6. ↑ Pete Dunn and Michael Fleischer (1983), New Mineral Names, American Mineralogist, vol. 68, pp. 642-45
  7. ↑ Michael Zelenski, Tonci Balic Zunic, Luca Bindi, Anna Caravelli, Emil Makovicky, Daniela Pinto, Filippo Vurro (2006), First Occurrence of Iodine in Natural Sulfosalts: The Case of Mutnovscite, American Mineralogist, vol. 91, pp. 21-28
  8. ↑ See the Collection of Minerals at the National Natural History Museum, Sofia, Bulgaria
  9. ↑ See the Madjarovo deposit at Mindat.com
Paragenesis of ardaite & galena, Madjarovo ore deposit, Bulgaria, National Natural History Museum, Sofia, Bulgaria

See also

List of minerals (complete)

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