Mineral Information and Data:

Beryl
Be3Al2Si6O18 [CNMNC approved formula]

Named possibly from the Greek "beryllos" which referred to a number of blue-green stones in antiquity.

IMA status : Valid species (Pre-IMA Ancient) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
61.01.01.01  
  (61) Cyclosilicate Six-Membered Rings
  (61.01) with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.01) Beryl group
  
Nickel-Strunz
(10th edition) :
09.CJ.05
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CJ) [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Unit cell: a = 9.215 Ǻ, c = 9.192 Ǻ
Crystal Habit: Short to long prismatic; often etched
Twinning: Rare, on {hkil}
  
Color: Colorless, white, light green to green, yellow, pink to pinkish orange
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 7.5 to 8
Measured Density: 2.6 to 2.9 g/cm3
Cleavage: 1; {0001} indistinct
Tenacity: Brittle
Fracture: Conchoidal to uneven
Streak: White
  
Geologic 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.
Mineral Association: Quartz, feldspar, muscovite, lepidolite, spodumene, amblygonite, tourmaline,
topaz, cassiterite, columbite, tantalite
  
Synonyms/varieties: Aquamerine (green-blue variety), emerald (green variety), goshenite (colourless variety), heliodor (yellow variety), morganite (pink variety), bixbite (red variety)
Other Properties: Gemstone Readily Available.

 

Beryl
Variety emerald
Origin: Malyschevo, Russia
Sample size: 13 x 10 x 9 cm
Photo: Tom Loomis

 

Beryl
(zoom-in of above)

 

Beryl
Variety aquamarine
Origin: Laurens, South Carolina, USA
Sample size: 7 x 5 x 4 cm, crystal 6 cm by 5 mm
Photo: Tom Loomis

 

Beryl
(zoom-in of above)

 

Beryl
Tourmaline in goshenite
Origin: Resplendor, Minas Gerais, Brazil
Sample size: 4.5 x 3.4 x 1.2 cm
Photo: Rob Lavinsky

 

Beryl
(zoom-in of above)

 

Beryl
Variety goshenite
Origin: Resplendor, Minas Gerais, Brazil
Sample size: about 2.5 cm
Photo: Tom Loomis

 

Beryl
(zoom-in of above)

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