Dumortierite In Quartz | Gemopedia

Named for the 19th century French paleontologist Eugene Dumortier, dumortierite crystals are intensely colored and extremely scarce, making them highly prized by mineral collectors. Frequently, dumortierite grows as inclusions within quartz, occurring as an abundance of tiny blue specks, so much as to make the gem appear blue. Other dumortierite colors include pink, purple, pink, reddish brown to brown.
Alternate
Names
Dumortierite Quartz
Colors
Dark Blue To Violet

Dumortierite In Quartz Classification

Common Name

Dumortierite In Quartz

Species

Quartz

Variety

Dumortierite In Quartz

Colors

Dark Blue To Violet

Alternate Names

Dumortierite Quartz

Gemstone Groups

Key Separations

Refractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters.

Comments

Misnomer: California lapis

Dumortierite In Quartz Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

0.009

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Comments

Dumortierite In Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Dumortierite In Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Dumortierite in quartz will contain dumortierite inclusions and might have liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile and iron particles.

Luster

Dull

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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