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Minerals - Elbaite | TerraCollect

Mineral - Elbaite

ElbaiteNa(Li₁,5Al₁,5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Na(Li₁,5Al₁,5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Unit Cell

a=15.90 c=7.10 Z=3

Physical Properties

Hardness

7 - 7.5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

redyellowgreenblueviolet

Birefringence

0.021

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Teilweise stark, in verschiedensten Farbvarianten

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

37.89

TiO₂

0.04

B₂O₃

10.28

Al₂O₃

43.85

FeO

0.11

MnO

0.11

CaO

0.07

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Indistinct after {1120} and {1011}

Fracture

uneven

Tenacity

Brittle

trigonal

Point Group

ditrigonal-pyramidal - 3m

Space Group

R3m (160)

Habit

granular, acicular, prismatic

Formation

Metamorphism, Magmatic

Paragenesis

Twinning

Rarity

Common

Synonyms

Elbaite

Li₂O

1.66

Na₂O

2.43

F

0.10

H₂O

3.47

Italy (Dana 1895)

Groups and Members

Tourmaline-Group