Rutilated Quartz | Gemopedia

Gemstones are usually treasured for their crystalline varieties that contain little or no inclusions. Some varieties, however, are favored because of their unique inclusions. One such variety is rutilated quartz. Striking in appearance, the thin, elongated red to golden rutile needles may form parallel to one another or have random distribution throughout the quartz. On rare occasions, needles may radiate in six different directions, creating a star-like pattern. Specimens exhibiting this pattern are the most highly prized of all.
Alternate
Names
Sagenitic Quartz
Colors
Colorless With Reddish, Golden, Silvery, Greenish Needles

Rutilated Quartz Classification

Common Name

Rutilated Quartz

Species

Quartz

Variety

Rutilated Quartz

Colors

Colorless With Reddish, Golden, Silvery, Greenish Needles

Alternate Names

Sagenitic 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

Colorless quartz with visible needle-like inclusions is sometimes called "sagenitic."

Rutilated Quartz Optical Properties

Transparency

Transparent - 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

Strength: weak fire Value: 0.013

Comments

Rutilated Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Rutilated Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

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

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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