Pezzottaite | Gemopedia

Displaying gorgeous deep raspberry pinks, pezzottaite is a relatively new gemstone that has been subject to much confusion due to its similarities with red beryl. Pezzottaite has a variety of trade names including Madagascan raspberyl, raspberyl and raspberry beryl. While pezzottaite is a member of the beryl group, due to its crystal structure and its cesium and lithium contents, it is a separate mineral species from beryl, making its trade names misleading.
Alternate
Names
Malagasite
Colors
Purplish Pink

Pezzottaite Classification

Common Name

Pezzottaite

Species

Pezzottaite

Variety

Colors

Purplish Pink

Alternate Names

Malagasite

Gemstone Groups

Key Separations

refractive index, birefringence, optic character and spectrum. Might show strain under the polariscope.

Comments

Pezzottaite is not actually a beryl variety, but so closely related that it is sometimes associated with the beryl species. Originally, it was thought of as a cesium-rich form of beryl, but now is generally considered a separate species. Misnomers: hot pink red beryl, raspberyl or red beryl. Often seen as cat's-eye.

Pezzottaite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.608-1.617
Tolerance:0.01

Birefringence

0.008-0.009

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

weak orangy pink

Pleochroism

Dichroic, moderate pinkish orange and purplish pink to pinkish purple

Dispersion

Comments

Pezzottaite Chemistry & Crystallography

Chemical Name

caesium, beryllium, lithium and aluminum silicate

Chemical Formula

Cs(Be2Li)Al2(SiO3)6

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Pezzottaite Characteristic Physical Properties

Hardness

8

Streak

Specific Gravity

3.04-3.14 Range:0.4/-0.6 Typical:3.1

Toughness

Fair

Inclusions

Pezzottaite is a Type III clarity stone. The stones frequently have liquid inclusions, fingerprints, growth tubes. If the stone has numerous growth tubes it can be chatoyant.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal

Cleavage

Good, in one direction

Comments

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