Sagenitic Quartz | Gemopedia

The term "sagenitic" is applied to quartz that contains a radiating mass of needle-like crystal inclusions of other minerals. Such minerals are commonly rutile, tourmaline, actinolite or goethite. While gemstones are usually prized for having no inclusions, sagenitic quartz specimens are treasured for their artistic, one-of-a-kind beauty, which make a beautiful display in a gem collection or jewelry pieces.
Alternate
Names
Sagenite, Cupid's Darts, Fleches D'amour, Venus Hair Stone, Thetis Hair Stone And Cat's Fur Quartz
Colors
Colorless Quartz With Various Colored Inclusions

Sagenitic Quartz Classification

Common Name

Sagenitic Quartz

Species

Quartz

Variety

Sagenitic Quartz

Colors

Colorless Quartz With Various Colored Inclusions

Alternate Names

Sagenite, Cupid's Darts, Fleches D'amour, Venus Hair Stone, Thetis Hair Stone And Cat's Fur 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 a variety called "sagenitic." Stones with red hematite inclusions or "beetles-legs" may take a reddish appearance and be called "strawberry quartz." If colorless quartz contains golden blades of rutile it is often called "rutilated quartz."

Sagenitic 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

Sagenitic Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Sagenitic Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Sagenitic quartz may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile, tourmaline, actinolite needles and iron particles.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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