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Minerals - Fluorellestadite | TerraCollect

Mineral - Fluorellestadite

FluorellestaditeCa₅(SiO₄)₁,5(SO₄)₁,5F

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Ca₅(SiO₄)₁,5(SO₄)₁,5F

Unit Cell

a=9,49 c=6,92 Z=4

Physical Properties

Hardness

4.5

Streak

whiteblueblue white

Optical Properties

Color

yellow

Birefringence

0,005

Luster

Vitreous,

Greasy

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

hexagonal

Point Group

Composition

Elements

Mass

SiO₂

15,30

Al₂O₃

1,84

Fe₂O₃

0,11

MnO

0,18

MgO

1,38

CaO

55,00

Na₂O

0,33

Density

Normal (2-3,5)

Cleavage

Unvollkommen auf (0001)

Fracture

conchoidal

Tenacity

Brittle

Space Group

Habit

coarse, granular, massive, acicular, prismatic, columnar, prismatic

Formation

Metasomatose, Kontaktmetamorphoe mit Kalksteinen

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Fluorellestadite

K₂O

0,10

F

3,60

H₂O

0,30

CO₂

0,66

P₂O₅

1,31

SO₃

20,75

Russland

Groups and Members

Apatit-Supergruppe

Ellestadit-Gruppe