Click on a letter above to view the list of gems.  

           


Emerald  (Beryl)
Current inventory:  0 gems
 

Emerald

Chemistry:  Be3(Al,Cr)2Si6O18  [Beryllium Aluminum Silicate]

Discovered (Prehistoric);   IMA status: Emerald - Not Valid; Beryl - Valid
The name Emerald is from the Greek smaragdos (green) through the Middle English word esmeralde. The name Beryl is from ancient Greek meaning "precious blue-green color of sea water" stone which was originally applied only to Aquamarine but was later used for the Beryl family.

 

Classification

   

   

Mineral Classification:

Silicates

Strunz 8th Ed. ID:

8/E.12-10

Nickel-Strunz 10th Ed. ID:

9.CJ.05

 

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si
6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions

Related to:

Beryl Group: Beryl, Bazzite, Indialite, Stoppaniite, Pezzottaite. Beryl Series

 

 

Crystal Data

   

   

Crystallography:

Hexagonal - Dihexagonal Dipyramidal

Crystal Habit:

Crystals prismatic to tabular, may be complexly terminated by pyramids, to 18 m and 180 tons. Also radial, trapiche, columnar; granular to compact.

Twinning:

Rarely

 

 

Physical Properties

   

 

Cleavage:

[0001] Imperfect

Fracture:

Conchoidal to Uneven

Tenacity:

Brittle

Hardness (Mohs):

7.5 - 8.0

Density:

2.68 - 2.80 (g/cm3)

Luminescence:

None

Radioactivity:

Not Radioactive

 

 

Optical Properties

   

   

Color:

Bluish Green to Green, "Emerald Green"

Transparency:

Transparent to Translucent

Luster:

Vitreous, Resinous

Refractive Index:

1.572 - 1.600  Uniaxial ( - )

Birefringence:

0.005 - 0.010 (varies by locality)

Dispersion:

0.014 (low)

Pleochroism:

Weak to Distinct

 

 

Occurances

   

   

Geological Setting:

In granites and granite pegmatites, rarely in nepheline syenites. Also in mafic metamorphic rocks, low- to high-temperature hydrothermal veins and in vugs in rhyolite.

Type Locality:

Prehistoric

Year Discovered:

Prehistoric

View mineral photos:

Emerald Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org (Emerald)
Mindat.org (Beryl)
Webmineral.com (Beryl)

 

 


Emerald is the green color variety of the
Beryl family of minerals that includes Aquamarine (blue), Bixbite (red), Goshenite (colorless), Heliodor (yellow), Morganite (pink) and Pezzottaite (pink/red). Emerald gets its green color from traces of cromium added to the basic Beryl formula. Emerald is found in many locations around the world. Probably the best known is the Muzo Mine in Columbia. This mine produced a 16,020 carat crystal! Emeralds from this location are generally considered the best color for Emerald. Emerald was mined at Queen Cleopatra's Ancient Egyptian emerald mine.
 

  
Emerald gems for sale:

We have not photographed our Emerald gems yet.  Please check back soon!
 

 

I love Sarah