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Minerals - Pezzottaite-(Cs) | TerraCollect

Mineral - Pezzottaite-(Cs)

Pezzottaite-(Cs)Cs(Be₂Li)Al₂(Si₆O₁₈)

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Cs(Be₂Li)Al₂(Si₆O₁₈)

Unit Cell

a=15.95 c=27.80 Z=18

Physical Properties

Hardness

8

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

redorangepinkorange red

Birefringence

0.011

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Orange-Rot-Violett

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

54.58

TiO₂

0.01

Al₂O₃

16.88

FeO

0.02

MnO

0.02

CaO

0.22

Na₂O

0.46

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Imperfect after {001}

Fracture

conchoidal,

uneven

Tenacity

Brittle

trigonal

Point Group

rhombohedral - 3

Space Group

R3 (148)

Habit

prismatic, tabular, barrel-shaped

Formation

Magmatic, in the late hydrothermal stage of LCT-type (lithium-cesium-tantalum) granit pegmatite fractionation, by hydrothermal crystallization in miarolitic cavities

Paragenesis

Twinning

Rarity

Very rare

Synonyms

Pezzottaite-(Cs)

K₂O

0.14

Rb₂O

0.44

Cs₂O

18.23

Li₂O

2.12

BeO

8.14

H₂O

0.28

Madagascar (Laurs et al. 2003)

Groups and Members

Beryl-Supergroup

Beryl-Group