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Minerals - Homilite | TerraCollect

Mineral - Homilite

HomiliteCa₂(Fe²⁺,Mg)B₂Si₂O₁₀

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Ca₂(Fe²⁺,Mg)B₂Si₂O₁₀

Unit Cell

a=9,79 b=7,62 c=4,78 β=91° Z=2

Physical Properties

Hardness

5 - 5.5

Streak

gray

Density

Normal (2-3,5)

Optical Properties

Color

blackgreenbluegreen blackblue green

Birefringence

0,023

Luster

Vitreous,

Resinous

Transparency

translucent

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

B₂O₃

31,87

Al₂O₃

18,08

Fe₂O₃

1,50

FeO

2,15

MnO

16,25

MgO

0,01

CaO

0,52

Cleavage

Undeutlich

Fracture

conchoidal

Tenacity

Brittle

monoclinic

Point Group

Space Group

Habit

massive, Octahedron, tabular

Formation

Magmatisch, in Pegmatiten

Paragenesis

Twinning

Auf (001) und (100)

Rarity

Very rare

Synonyms

Homilite

Na₂O

27,28

1,50

SiO2

Groups and Members

Gadolinit-Supergruppe

Gadolinit-Gruppe

Datolith-Subgruppe