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Minerals - Chrysoberyl | TerraCollect

Mineral - Chrysoberyl

ChrysoberylBeAl₂O₄

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

BeAl₂O₄

Unit Cell

a=4.43 b=9.42 c=5.48 Z=4

Physical Properties

Hardness

8.5

Streak

white

Density

Heavy (3,5-6)

Optical Properties

Color

brownyellowgreenbluevioletcolorless

Birefringence

0.010

Luster

Vitreous,

Greasy

Transparency

translucent,

transparent

Pleochroism

X = Rot Y = Orange-Gelb Z = Grün

Geomineralogical Properties

Composition

Elements

Mass

TiO₂

0.55

Al₂O₃

76.34

FeO

3.60

BeO

19.15

USA (Palache et al. 1952)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Distinct after {110}, imperfect after {010}, indistinct after {001}

Fracture

uneven

Tenacity

Brittle

Crystal System

orthorhombic

Point Group

orthorhombic-dipyramidal - 2/m 2/m 2/m

Space Group

Pnma (62)

Habit

prismatic, tabular

Formation

Magmatic (pegmatites), Metamorphism, alluvial

Paragenesis

Twinning

Two- to six-count rotational twins after {130}

Rarity

Rather rare

Synonyms

Chrysoberyl