Datolite | Gemopedia

Datolite is a phyllo-borosilicate commonly forming as nodules in igneous rocks. Facet-grade material rarely yields gems larger than 10 carats, with most being significantly smaller. Colorless, transparent datolite gems can be found in several locations worldwide, but many come from Connecticut, Massachusetts, New Jersey, and Virginia. Copper-stained, opaque nodules from Michigan are typically fashioned into cabochons.
Colors
Colorless, White, Light Green, Light Yellow, Pink, Violet, Brown, Gray

Datolite Classification

Common Name

Datolite

Species

Datolite

Variety

Colors

Colorless, White, Light Green, Light Yellow, Pink, Violet, Brown, Gray

Alternate Names

Gemstone Groups

Datolite

Key Separations

RI, birefringence, optic sign and SG

Comments

Datolite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.626-1.67
Tolerance:-0.004

Birefringence

0.044-0.046

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.016

Comments

Datolite Chemistry & Crystallography

Chemical Name

Chemical Formula

CaBSiO4(OH)

Synthesis

Crystal System

Monoclinic

Classification

Nature

Natural

Crystallinity

Crystalline

Comments

Datolite Characteristic Physical Properties

Hardness

5-5.5

Streak

Specific Gravity

3-2.9 Typical:2.95

Toughness

Fair

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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