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Minerals - Armenite | TerraCollect

Mineral - Armenite

ArmeniteBaCa₂Al₆Si₉O₃₀ · 2H₂O

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

BaCa₂Al₆Si₉O₃₀ · 2H₂O

Unit Cell

a=13.87 b=18.66 c=10.70 Z=4

Physical Properties

Hardness

7.5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

colorless

Birefringence

0,006

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

orthorhombic

Point Group

Composition

Elements

Mass

SiO₂

46.18

Al₂O₃

27.52

CaO

9.99

SrO

0.04

BaO

12.37

Na₂O

0.16

K₂O

0.13

Karten-Ebenen

Geologische KarteSatelliten Karte

Name and first find : Named after the type locality, the Armen Mine in Norway. First discovered in 1877.

Synonyms :

Varieties :

Abbreviation : Amn

literature

Neumann, H. (1939). Armenite, a new mineral. Preliminary note. Norsk Geol. Tidsskr , 19 , 312-13.

Cleavage

Perfect after {001}

Fracture

uneven

Tenacity

Brittle

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

Space Group

Pnna (52)

Habit

blocky, prismatic

Formation

Trough the alteration of Ba-rich metamorphic rocks and igneous diorites

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Armenite

H₂O

3.52

Canada (Neumann 1939)

Groups and Members

Osumilite-Group