Tugtupite | Gemopedia

Tugtupite gets its unique name from the location of its discovery in southwest Greenland. This semi-transparent to opaque mineral species is usually pink to red and often mottled with white, gray or black. Nicknamed the "Reindeer Stone," tugtupite is tenebrescent; when stored in darkness, the gem's color will fade, but returns immediately upon exposure to daylight. Among collectors, tugtupite is also prized for its luminescent properties: strong fluorescence and less commonly, phosphorescence, when the gem continues to fluoresce even after the ultraviolet light source has been removed.
Alternate
Names
Reindeer Stone
Colors
Usually Pink To Red, Often Mottled With White, Gray, Black; Rarely Light Blue

Tugtupite Classification

Common Name

Tugtupite

Species

Tugtupite

Variety

Colors

Usually Pink To Red, Often Mottled With White, Gray, Black; Rarely Light Blue

Alternate Names

Reindeer Stone

Gemstone Groups

Key Separations

appearance, RI, SG and fluorescence

Comments

Misnomer: beryllium sodalite. Piezoelectric: development of opposite charges at the ends of a tourmaline crystal when placed under stress.

Tugtupite Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.496-1.502

Birefringence

0.006

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to moderate orange-red
LWUV: moderate to strong orange-red

CCF Reaction

Pleochroism

Dichroic, moderate purplish red and orange-red

Dispersion

Comments

Tugtupite Chemistry & Crystallography

Chemical Name

Chemical Formula

Na4AlBeSi4O12Cl

Synthesis

Crystal System

Tetragonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Tugtupite Characteristic Physical Properties

Hardness

4-6.5

Streak

Specific Gravity

2.3-2.58 Typical:2.36

Toughness

Good

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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