Scolecite | Gemopedia

Scolecite is a fascinating zeolite mineral. Its name is derived from the Greek word, skolex, meaning worm because under a flame, scolecite curls up like a worm. It shares the unusual properties of piezoelectricity and pyroelectricity with other gem minerals like tourmaline.
Colors
Colorless, White

Scolecite Classification

Common Name

Scolecite

Species

Scolecite

Variety

Colors

Colorless, White

Alternate Names

Gemstone Groups

Key Separations

Birefringence

Comments

Might curl up like a worm when exposed to a flame. Pyroelectric: development of opposite charges at the ends of the crystal due to change in temperature. Piezoelectric: development of opposite charges at the ends of the crystal when placed under stress.

Scolecite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.509-1.525

Birefringence

0.007-0.012

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to weak yellow
LWUV: Inert to weak bluish white

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: strong fire

Comments

Scolecite Chemistry & Crystallography

Chemical Name

Chemical Formula

CaAl2Si3O10.3H2O

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Scolecite Characteristic Physical Properties

Hardness

5-5.5

Streak

White

Specific Gravity

2.21-2.29

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Perfect, in two directions

Comments

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