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0.9.5

Minerals - Aegirine | TerraCollect

Mineral - Aegirine

AegirineNaFe[Si₂O₆]

Links

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

NaFe[Si₂O₆]

Unit Cell

a=9.66 b=8.80 c=5.29 β=107° Z=4

Physical Properties

Hardness

Streak

grayyellow gray

Density

Optical Properties

Color

blackgreen

Birefringence

0.037-0.061

Luster

Vitreous

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Composition

Elements

Mass

SiO₂

51.35

TiO₂

1.10

AlsO₃

2.15

Fe₂O₃

28.66

FeO

2.24

MgO

0.10

CaO

1.25

Map-Layer

Geological MapSatellite Map

Name and first discovery : Named after the Norse god of the seas, Ægir, due to its first discovery. First described by P.H. Ström (1821) from Rundemyr, Norway.

Abbreviation : Aeg

literature

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

Normal (2-3,5)

Cleavage

good after {110}

Fracture

uneven

Tenacity

Brittle

Point Group

monoclinic-prismatic - 2/m

Space Group

C2/c (15)

Habit

acicular, prismatic

Formation

Under agpaitic to peralkaline conditions in differentiated syenitic and phonolitic magmas as well as in their pegmatites and hydrothermal fissure fillings, whereby its formation is favored by high Na and Fe³⁺ activity and low Ca contents

Paragenesis

Twinning

Nach {100} und {010}

Rarity

Common

Synonyms

Aegirine, Acmite, Acnite, Agirine, Aegyrine, Aegyrite, Aegerite, Pyroxene

Varieties

Fedorovit

Na₂O

12.66

K₂O

0.15

H₂₀

0.29

Brazil (Dana 1892)

Groups and Members

Pyroxene-Group

Clinopyroxene Subgroup