Registration via App only

You need a Google Account on your mobilephone, to use TerraCollect on the web. Download the app to set up your minerals, fossils, and rocks – the web portal will then be fully accessible to you. : Download

Are you already register on TerraCollect?

By signing in, you accept the Privacy policy.

Loading data...

Impressum Privacy Policy Sponsors App-Import

© 2026 TerraCollect

0.9.5

Minerals - Ardennite-(As) | TerraCollect

Mineral - Ardennite-(As)

Ardennite-(As)Mn²⁺₄Al₄(Al,Mg)(AsO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆

Links

Chemical Properties

Mineral Class

Silicates

Toxicity

low

Formula

Mn²⁺₄Al₄(Al,Mg)(AsO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆

Unit Cell

a=8.71 b=18.51 c=5.81 Z=2

Physical Properties

Hardness

6 - 7

Streak

white

Density

Heavy (3,5-6)

Optical Properties

Color

brownorangeyellow

Birefringence

0.015

Luster

Vitreous,

Greasy

Transparency

translucent,

opaque

Pleochroism

X: Braun Y: Orange Z: Gelb

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

27.85

Al₂O₃

23.55

Fe₂O₃

0.86

As₂O₅

13.25

V₂O₅

0.89

MnO

25.70

CuO

0.26

Map-Layer

Geological MapSatellite Map

Name and first discovery : Named after the "Ardennes" (mountain range) in Luxembourg/Belgium, where the type locality is located. First discovered in 1872.

Abbreviation : Ard-As

literature

Dana, J. D., & Dana, E. S. (1892). The system of mineralogy of James Dwight Dana, 1837-1868: descriptive mineralogy . J. Wiley & sons.

Cleavage

Perfect after {010}, indistinc after {110}

Fracture

conchoidal,

uneven

Tenacity

Brittle

orthorhombic

Point Group

orthorhombic-dipyramidal - 2/m 2/m 2/m

Space Group

Pmmm (47)

Habit

coarse, fibrous, massive, acicular, tabular

Formation

In quartz veins of metamorphic overprinted Mn-rich metasediments

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Ardennite-(As), Ardennite

MgO

2.30

CaO

1.17

H₂O

5.12

Belgium (Dana 1892)

Groups and Members

Ardennite-Group