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Rutilated Quartz

Quartz

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Rutilated Quartz Polished Rutilated Quartz Rough Rutilated Quartz Jewelry
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Table of Contents
  • General Information
  • Rutilated Quartz Colors
  • Alternate Names
  • Countries of Origin
  • History
  • Care

Rutilated quartz contains inclusions of the mineral rutile. The red to golden, thin, elongated rutile needles may form in parallel clusters, at specific angles, or in a random distribution throughout the quartz. Stones where the rutile grows in six directions radiating out from a center point, creating a star-like pattern, are sought after by collectors. Rutile is usually seen in rock crystal and smoky quartz, but it can be found in other types of quartzes.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Rutilated Quartz
Species
Quartz
Transparency
Transparent - Opaque
Dispersion
Strength: Weak Fire Value: 0.013
Refractive Index
1.544-1.553
Tolerance:very constant
Birefringence
0.009
Optic Character
Uniaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
None
Hardness
7
Streak
White
Specific Gravity
2.640-2.690 Typical:2.660
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
Chemical Name
silicon dioxide (aka silica)
Chemical Formula
SiO2
Crystal System
Trigonal
Chemistry Classification
Silicate

Rutilated Quartz Colors

  • Brown Rutilated Quartz
    Brown
  • Colorless Rutilated Quartz
    Colorless
  • Multi-color Rutilated Quartz
    Multi-color
  • Red Rutilated Quartz
    Red
  • Yellow Rutilated Quartz
    Yellow

Alternate Names

Sagenitic Quartz

Countries of Origin

Argentina; Russian Federation; Pakistan; Unknown; Sri Lanka; United States of America; Brazil; Madagascar; India

History

Sometimes you want the unusual... the distinctive... the unique. Rutilated quartz is all that and more. Although most stones are prized for their clarity, some are prized for their lack of it. Enter rutilated quartz. This stone has thin, elongated, red-to-golden rutile (needle-like inclusions). They may run parallel to one another or be randomly distributed within a stone; some even run in six directions to create a star. Rutilated quartz is waiting to become a star in your jewelry wardrobe. Don't make it wait.

Care

Like its sister stones, amethyst and ametrine, this quartz is a 7 on the Mohs scale of hardness. That makes it a very wearable stone. Wash in warm water; avoid harsh chemicals,

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