Heliodor (Golden Beryl) | Gemopedia

Displaying characteristic yellow to yellowish greens, heliodor is the most cheerful variety of beryl. Interestingly, as an allochromatic gem, pure beryl is colorless, with traces of different elements responsible for beryl's wide range of colors. Heliodor is named from ancient Greek words meaning "gift from the sun," as it was once believed that heliodor harnessed the power and warmth of the sun and was responsible for the change between day and night.
Alternate
Names
Golden Beryl
Colors
Yellow, Greenish Yellow To Orangy Yellow

Heliodor (Golden Beryl) Classification

Common Name

Heliodor (Golden Beryl)

Species

Beryl

Variety

Heliodor

Colors

Yellow, Greenish Yellow To Orangy Yellow

Alternate Names

Golden Beryl

Gemstone Groups

Key Separations

refractive index, birefringence, optic character, and possibly magnification

Comments

RI usually falls closer to the 1.577 range.

Heliodor (Golden Beryl) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.577-1.583
Tolerance:(+0.017/-0.017)

Birefringence

0.005-0.009

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, weak to moderate, varying shades of body color

Dispersion

Strength: weak fire Value: 0.014

Comments

Heliodor (Golden Beryl) Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

Crystal System

Hexagonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Heliodor (Golden Beryl) Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.67-2.9 Range:0.18/-0.05 Typical:2.72

Toughness

Good

Inclusions

Heliodor is a type I clarity stone but sometimes contains tubular, liquid or planes of small two-phase inclusions.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

Poor, in one direction

Comments

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