Medusa Quartz | Gemopedia

This unusual name refers to equally unusual inclusions within this crystal. Medusa quartz is host to beautiful radial tufts of blue to green gilalite. The umbrella-like formations were named for their uncanny resemblance to the medusa jellyfish.
Alternate
Names
Gilalite In Quartz
Colors
Colorless With Green, Blue-Green Inclusions

Medusa Quartz Classification

Common Name

Medusa Quartz

Species

Quartz

Variety

Medusa Quartz

Colors

Colorless With Green, Blue-Green Inclusions

Alternate Names

Gilalite In 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

Medusa quartz gets its name because the gilalite inclusions look like the Medusas Rondeau jellyfish.

Medusa Quartz Optical Properties

Transparency

Transparent - Translucent

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

Medusa 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

Medusa Quartz Characteristic Physical Properties

Hardness

7

Streak

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Medusa quartz will contain gilalite inclusions and may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile and iron particles.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1