Rutile | Gemopedia

The name rutile comes from the Latin rutilas, meaning "reddish," as this mineral is usually red to golden in color. Rutile forms in a wide array of habits, and is often seen as an inclusion within gems, either in large needles that make bold patterns, or fine, microscopic fibers that cause chatoyancy and asterism in gems. It is highly refractive, and is occasionally found in facetable sizes.
Colors
Red, Reddish Brown, Pale Yellow, Pale Blue, Violet, Black, Green

Rutile Classification

Common Name

Rutile

Species

Rutile

Variety

Colors

Red, Reddish Brown, Pale Yellow, Pale Blue, Violet, Black, Green

Alternate Names

Gemstone Groups

Key Separations

High luster, extreme fire, OTL RI reading, eye visible doubling, poor polish.

Comments

Rutile often is seen as golden needles in other gem materials. Synthetic rutile is used as a diamond simulant.

Rutile Optical Properties

Transparency

Transparent - Opaque

Refractive Index

Over the Limit 2.616-2.903

Birefringence

0.287

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, strong, varying shades of body color

Dispersion

Strength: extreme fire Value: 0.33

Comments

Rutile Chemistry & Crystallography

Chemical Name

titanium oxide

Chemical Formula

TiO2

Synthesis

Crystal System

Tetragonal

Classification

Oxide

Nature

Natural

Crystallinity

Crystalline

Comments

Rutile Characteristic Physical Properties

Hardness

6-6.5

Streak

Grayish Black, Pale Brown, Light Yellow

Specific Gravity

4.2-4.3 Typical:4.26

Toughness

Varies

Inclusions

Luster

Adamantine

Stability

Fracture

Conchoidal, Uneven

Cleavage

Good, in two directions

Comments

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