Ardaite

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Ardaite
Ardaite in Galenite Madjarovo ore deposit.jpg
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[edit]

Paragenesis of ardaite & galena, Madjarovo ore deposit, Bulgaria, National Natural History Museum, Sofia, Bulgaria

See also[edit]

List of minerals (complete)