Amblygonite | Gemopedia

Amblygonite is quite possibly one of the most beautiful pastel colored gemstones that you may have never heard about. It belongs to a class of minerals known as phosphates and forms a solid-solution series with montebrasite. Industrial grade amblygonite isn't that rare; however, when it comes to facet grade material, it quickly moves up on the hard-to-find list. Colors for amblygonite include pale yellow to greenish yellow and various shades of green to blue. On rare occasions, pink to light purple specimens may be found. Colorless material also is available.
Colors
Colorless, Straw Yellow, Yellow, Lemon Yellow, Greenish Yellow, Light Green, Green, Light Pink, Blue, Brown

Amblygonite Classification

Common Name

Amblygonite

Species

Amblygonite

Variety

Colors

Colorless, Straw Yellow, Yellow, Lemon Yellow, Greenish Yellow, Light Green, Green, Light Pink, Blue, Brown

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence, optic character, SG, fluorescence.

Comments

Amblygonite Optical Properties

Transparency

Transparent

Refractive Index

1.612-1.636
Tolerance:-0.034

Birefringence

0.02-0.027

Optic Character

Biaxial

Optic Sign

Positive or Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to moderate orange
LWUV: Inert to moderate yellowish white

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.014

Comments

Amblygonite Chemistry & Crystallography

Chemical Name

lithium aluminum phosphate fluoride hydroxide

Chemical Formula

(Li,Na)Al(PO4)(F,OH)

Synthesis

Crystal System

Triclinic

Classification

Phosphate

Nature

Natural

Crystallinity

Crystalline

Comments

Amblygonite Characteristic Physical Properties

Hardness

5.5-6

Streak

White

Specific Gravity

3.06-2.98 Typical:3.02

Toughness

Poor

Inclusions

Amblygonite might show liquid inclusions has a screen like appearance. Stones might also have a hazy parallel bands along the cleavage planes.

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal

Cleavage

Perfect, in one direction, Good in one direction

Comments

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