Citrine | Gemopedia

Citrine is one of the most popular gemstones in the quartz group. Prized for its excellent transparency, citrine is one of November's birthstones. Naturally, it occurs in close proximity to amethyst and is found in beautiful golden, mandarin orange and madeira red hues. It's possible that quartz crystals that grew naturally as amethyst or smoky quartz were turned into citrine by natural heat from nearby magma activity. Today, many of the citrines on the market are actually heated amethyst or smoky quartz.
Alternate Names
Madeira Citrine
Colors
Yellow To Yellowish Orange

Citrine Classification

Common Name

Citrine

Species

Quartz

Variety

Citrine

Colors

Yellow To Yellowish Orange

Alternate Names

Madeira Citrine

Gemstone Groups

Key Separations

refractive index, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz. Might also show Airy's spiral. Careful observation that reveals Brazil-law twinning separates citrine from scapolite with similar properties.

Comments

Citrine is the common variety name for transparent quartz with a predominantly yellow to orange body color. Stones might be piezoelectric: able to generate electricity produced by mechanical pressure, Pyroelectricity: development of opposite charges at the ends of the axis due to change in temperature and triboluminescent: luminescence produced by friction. Misnomers: topaz quartz, Spanish topaz, Saxon topaz, Madeira topaz, citrine topaz, topaz quartz.

Citrine Optical Properties

Transparency

Transparent

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

0.009-0.009

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, weak to moderate shades of yellow

Dispersion

Strength: weak fire Value: 0.013

Comments

Citrine Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Citrine Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Range:0.03/-0.02 Typical:2.66

Toughness

Good

Inclusions

Citrine is a type I clarity. Color zoning in citrine is often present in the form of "tiger stripes" or "zebra stripes". Stones may contain crystals, negative crystals, liquid inclusions, two-phase inclusions and partially-healed fractures.

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