Natrolite | Gemopedia

Natrolite is a zeolite mineral named for the Greek word natron meaning "soda" due to the presence of sodium in the stone. Its range of colors include yellow, gray, brown to colorless. Occasionally, it is found in pale yellow to red hues. Crystals often grow in long, needle-like formations, and are especially prized by specimen collectors.
Colors
White, Colorless, Reddish, Greenish, Brownish, Yellowish.

Natrolite Classification

Common Name

Natrolite

Species

Natrolite

Variety

Colors

White, Colorless, Reddish, Greenish, Brownish, Yellowish.

Alternate Names

Gemstone Groups

Key Separations

RI, appearance and possibly fluorescence.

Comments

Sometimes pyroelectric: development of opposite charges at the ends of the crystal due to change in temperature. Sometimes piezoelectric: development of opposite charges at the ends of the crystal when placed under stress.

Natrolite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.48-1.493

Birefringence

0.012-0.013

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to strong green
LWUV: Inert to weak greenish white

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.005

Comments

Natrolite Chemistry & Crystallography

Chemical Name

hydrated sodium aluminum silicate

Chemical Formula

Na2[Al2Si3O10].2H2O

Synthesis

Crystal System

Orthorhombic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Natrolite Characteristic Physical Properties

Hardness

5-5.5

Streak

White

Specific Gravity

2.2-2.26

Toughness

Poor

Inclusions

Natrolite is usually found as a fibrous aggregate. Stones might have yellowish brown acmite inclusions that appear rod-like.

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Perfect, in one direction

Comments

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