Difference between revisions of "Citrine"

From The Gemology Project
Jump to: navigation, search
 
 
(5 intermediate revisions by 3 users not shown)
Line 1: Line 1:
{|  align=right width=250px {{table}}
+
{{citrine}}
|-
+
[[image:Citrine_rough_and_cut.jpg|left|thumb|250px|Citrine oval faceted on Madiera Citrine Crystals.<br />Photo courtesy of Barbra Voltaire]]
! colspan=2 | Citrine
+
<br clear="left" />
|-
 
| Chemical composition || edit me
 
|-
 
| Crystal system || edit me
 
|-
 
| Habit || edit me
 
|-
 
| Cleavage || edit me
 
|-
 
| Fracture || edit me
 
|-
 
| Hardness || edit me
 
|-
 
| Optic nature || edit me
 
|-
 
| Refaction index || edit me
 
|-
 
| Birefringence || edit me
 
|-
 
| Dispersion || edit me
 
|-
 
| Specific gravity || edit me
 
|-
 
| Lustre || edit me
 
|-
 
| Pleochroism || edit me
 
|}
 
  
__ToC__
+
 
 +
Citrine is a yellow or golden variety of [[quartz]]. Most citrine available today is heat-treated [[amethyst]]. When amethyst is heated to about 482.2 degrees Celsius, it alters to to a golden tone. Citrine has been credited with curing urinary tract infections, jaundice and kidney ailments. This is obviously a color association.
 +
==Inclusion Images: Click on Image for Full Size==
 +
 
 +
[[image:Citrine_banding_00.jpg|thumb|left|240px|Citrine showing color banding.This stone was originally an amethyst which was heat treated.<br />Photo courtesy of Conny Forsberg]]

Latest revision as of 09:46, 26 July 2009

Citrine
Chemical composition Silicon dioxide SiO2
Crystal system Trigonal
Habit Prismatic
Cleavage Poor
Fracture Conchoidal
Hardness 7
Optic nature Uniaxial +
Refractive index 1.544 - 1.553
Birefringence 0.009
Dispersion Low, 0.013
Specific gravity 2.63 - 2.65
Lustre Vitreous
Pleochroism Weak to distinct
Citrine oval faceted on Madiera Citrine Crystals.
Photo courtesy of Barbra Voltaire



Citrine is a yellow or golden variety of quartz. Most citrine available today is heat-treated amethyst. When amethyst is heated to about 482.2 degrees Celsius, it alters to to a golden tone. Citrine has been credited with curing urinary tract infections, jaundice and kidney ailments. This is obviously a color association.

Inclusion Images: Click on Image for Full Size

Citrine showing color banding.This stone was originally an amethyst which was heat treated.
Photo courtesy of Conny Forsberg