image 3,0 x 2,4 mm

image 1,8 x 1,3 mm

- 2 terminated ardennite crystals on quartz crystal -

image 44 x 34 mm

- large terminated ardennite crystals (up to 15 x 3mm) -

image 3,0 x 2,4 mm

image 5,0 x 4,0 mm

image 50 x 40 mm

ARDENNITE-(As)

BELGIUM , LUXEMBOURG PROVINCE

ARDENNES / STAVELOT MASSIF / SALMCHATEAU ( TYPE LOCALITY )

Classification of Ardennite

IMA status:

Approved

Strunz ID:

8/C.34-10

8 : Silicates
C : Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders
34 : Ardennite - Orientite series

Hey's CIM Ref.:

17.7.4

Physical Properties

Colour:

Yellow to Brown

Hardness (Mohs')

6 – 7

Crystallography

Crystal System:

Orthorhombic

Cell Parameters:

a = 8.71, b = 18.51, c = 5.81

Ratio:

a:b:c = 0.471 : 1 : 0.314

Optical Data

Type:

Biaxial (+)

Relationship of Ardennite to other Species

Related Minerals (Strunz Grouping):

8/C.34-14

Medaite

(Mn,Ca)

(V,As)Si

8/C.34-16

Saneroite

(Mn,Mn)

(OH)

8/C.34-20

Orientite

MnMn

(OH)

Chemical Properties

Formula:

(Al,Mg)

(SiO

)

(Si

)[(As,V)O

](OH)

Elements:

Al, As, H, Mg, Mn, O, Si, V

Common Impurities:

Ti,Cu

Other Names for Ardennite

Synonyms:

Dewalquite

Varieties:

Arsenioardennite

MINDAT http://www.mindat.org/min-322.html

DILLEN http://users.skynet.be/rik.dillen/ardenn.htm

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