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0.2.41

Minerals - Euclase | TerraCollect

Mineral - Euclase

EuclaseBeAl[OH|SiO₄]

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

BeAl[OH|SiO₄]

Unit Cell

a=4.76 b=14.29 c=4.62 β=100° Z=4

Physical Properties

Hardness

7.5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

greenbluecolorless

Birefringence

0.019

Luster

Vitreous

Transparency

translucent,

transparent,

opaque

Pleochroism

X=Y: Farblos-Blau Z: Blau

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

41.60

Al₂O₃

34.76

FeO

0.28

BeO

16.95

Na₂O

0.13

K₂O

0.04

H₂O

5.95

Brazil (Biscoe & Warren 1933)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Perfect after {010}, imperfect after {110} and {001}

Fracture

conchoidal

Tenacity

Brittle

monoclinic

Point Group

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

prismatic

Formation

hydrothermal

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Euclase