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Minerals - Ilvaite | TerraCollect

Mineral - Ilvaite

IlvaiteCa(Fe²⁺)₂Fe³⁺[O|OH|Si₂O₇]

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Ca(Fe²⁺)₂Fe³⁺[O|OH|Si₂O₇]

Unit Cell

a=8.80 b=13.02 c=5.85 Z=4

Physical Properties

Hardness

5.5 - 6

Streak

blackbrownbrown black

Optical Properties

Color

black

Birefringence

0.156

Luster

Metallic

Transparency

opaque

Pleochroism

Schwarz/Grün/Braun

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Composition

Elements

Mass

SiO₂

29.30

Fe₂O₃

20.30

FeO

33.50

MnO

1.97

CaO

13.71

H₂O

1.90

Greenland (Dana 1895)

Groups and Members

Lawsonite-Group

Karten-Ebenen

Geologische KarteSatelliten Karte

Density

Heavy (3,5-6)

Cleavage

Distinct after {001} and {010}

Fracture

uneven

Tenacity

Brittle

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

blocky, massive, prismatic, radial

Formation

Contact metasomatic (skarn) through the supply of iron-rich hydrothermal fluids into carbonate rocks

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Ilvaite