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Mineralpedia Details for Ardennite-(As)

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Ardennite-(As)

Ardennite-(As)

Originally just referred to as Ardennite, which was named for the type locality in the Ardennes Mountains in Belgium, it has since been redefined as Ardennite-As, as there is also a vanadate (VO4) analogue of the mineral. Ardennite-As is a rare mineral that occurs in pegmatites, quartz veins, and highly oxidized manganese and aluminum rich sediments. Localities include in, additionally, Italy, France, England, Greece, India, and Japan. Associated minerals include quartz, albite, pyrolusite, piemontite, spessartine, braunite, and hematite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/ardennite.pdf

Formula
Mn2+4(AlMg)Al4(Si5As)O22(OH)6 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Euhedral Crystals 
Cleavage
Perfect, Distinct, Parting 
Luster
Subadamantine 
Color
yellow, yellow brown, dark brown, orange, black 
Streak
pale brownish yellow 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
6-7 
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Ardennite-(As) from Arrow Junction, Central Otago, New Zealand

Ardennite-(As)
            from Arrow Junction, Central Otago, New Zealand

Orange platy crystals in what is described as "crack - seal quartz".

Click thumbnail images for larger view.

Ardennite-(As) from Salm-Château, Vielsalm, Stavelot Massif, Luxembourg, Belgium

Ardennite-(As)
            from Salm-Château, Vielsalm, Stavelot Massif, Luxembourg, Belgium

Rich orange platy crystals to 5mm on Quartz.

Click thumbnail images for larger view.

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