Haüyne | Gemopedia

Haüyne is a highly sought-after gem due to its rarity and incredible, electrifying color. Its mesmerizing blue hues are unforgettable and as rich as those seen in the most prized sapphires and Paraíba tourmalines. Haüyne is an extremely rare mineral and even rarer gemstone. Also called haüynite, it was named in honor of 18th century French scientist and crystallography pioneer René-Just Haüy, who many consider one of the fathers of modern gemology. Its first mention was in 1807 when crystals were discovered among volcanic lavas in Italy. It is known for its electric blue color, but can also be found in white, gray, yellow, green and pink colors.
Alternate
Names
Hauynite
Colors
Neon Blue
, Green Blue
, White
, Gray
, Yellow
, Green
, Pink

Haüyne Classification

Common Name

HaüYne

Species

HaüYne

Variety

Colors

neon blue, green blue, white, gray, yellow, green and pink

Alternate Names

hauynite

Gemstone Groups

Group: Sodalite

Key Separations

RI and appearance.

Comments

Haüyne is usually an intense blue color and always comes in small sizes. Haüyne gives lapis lapis lazuli its blue color.

Haüyne Optical Properties

Transparency

Transparent To Opaque

Refractive Index

1.496-1.51

Birefringence

Optic Character

NA

Optic Sign

Polariscope Reaction

doubly refractive (DR) or AGG depending on transparency

Fluorescence

SWUV: Inert to weaker orangy red
LWUV: Inert to weak orangy red

CCF Reaction

Pleochroism

Dispersion

Comments

Haüyne Chemistry & Crystallography

Chemical Name

sodium calcium aluminum silicate sulfur sulfate chloride

Chemical Formula

(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Haüyne Characteristic Physical Properties

Hardness

5.5-6

Streak

white to bluish

Specific Gravity

2.4-2.5

Toughness

Poor

Inclusions

Healing cracks and crystal inclusions.

Luster

Vitreous To Greasy

Stability

Fracture

Conchoidal

Cleavage

Perfect

Comments

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