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PHENAKITE                                NATURAL COLOR                       Hardness 7.5 
Next page     Phenakite Crystal   Faceted Phenakite
14.09 cts. Phenakite crystal cluster  single 

22.4 x 13.7 mm. Size of individual crystal: 12.6 x 7.4 mm

( Translucent )  Enhancement: none (N)

Enlarge

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw1409c 

 

8.47 cts. Phenakite crystal cluster  single 

12.5 x 12 mm.

( Translucent )   Enhancement: none (N)

stone PRICE  

USD 74.00 

ORIGIN: Madagascar

ref: PHCw847c 

 

 33.19 cts. Phenakite crystal cluster  single 

28.4 x 22 mm. Size of individual crystal: 9.5 x 6.7 mm

( Bi terminated )  Enhancement: none (N)

stone PRICE  

USD 128.00 

ORIGIN: Madagascar

ref: PHCw3319c 

 

10.99 cts. Bi terminated  Phenakite crystal single

   13  x  10.4  mm. (Translucent) (Glossy)

 Enhancement: none (N) 

stone PRICE  

USD 99.00 

ORIGIN: Madagascar

ref: PHCw1099c 

 

15.49 cts. Phenakite crystal  single 

14.2 x 13.4 mm. ( Bi terminated )

Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw1549c 

 

18.09 cts. Phenakite crystal  single 

15.2 x 12.3 mm. ( needle crystal inside )

( Translucent )   Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw1809c 

 

 21.27cts. Phenakite crystal cluster  single 

20.6 x 17.2 mm. Size of individual crystal: 9.5 x 8.9 mm

( Translucent )   Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw2127c 

 

23.51 cts. Phenakite crystal cluster  single 

23 x 22.4 mm. Size of individual crystal: 10 x 6.6 mm ( Translucent ) 

( Bi terminated )  Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw2351c 

 

 9.22 cts. Bi terminated  Phenakite crystal single 

  12.8  x  10  mm.  (Translucent) (Glossy)

  Enhancement: none (N)

stone PRICE  

USD 92.00 

ORIGIN: Madagascar

ref: PHCw922 

 

 9.24 cts. Bi terminated  Phenakite crystal single

  13.1  x  9.2  mm.  (Translucent) (Glossy)

  Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw924 

 

 17.76 cts. Phenakite crystal cluster  single 

 16 x 16.6 mm. Size of individual crystal: 9.8 x 5.7 mm ( Translucent ) 

( Bi terminated )  Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHCw1776c 

Next page     Phenakite Crystal   Faceted Phenakite

General Information

 Chemical Formula: Be2SiO4
 Composition: Molecular Weight = 110.11 gm
   Berylium16.37 %  Be   45.43 % BeO
   Silicon  25.51 %  Si   54.57 % SiO2
   Oxygen   58.12 %  O
             ______        ______
             100.00 %      100.00 % = TOTAL OxIDE
 Empirical Formula: Be2(SiO4)
 Environment: Alpine fissures, pegmatites, and hydrothermally altered rocks.
 Locality: Habachtal, Austria. Madagascar
 Name Origin: From the Greek phenakos - "liar."
 

Phenakite Image

Prismatic, bi- terminated crystals of Phenakite Click on the picture to go to             facet Phenakite.
   

Crystallography

 Axial Ratios: a:c = 1:0.66164
 Cell Dimensions: a = 12.472, c = 8.252, Z = 18; V = 1,111.63 Den(Calc)= 2.96
 Crystal System:  Trigonal-Rhomboedal H-M Symbol ( -3) Space Group: R3-
 x Ray Diffraction: By Intensity(I/Io): 3.119(1)3.66(0.8)2.518(0.75)
   
 

Physical Properties

 Cleavage: [1120] Distinct
 Color: colorless, wine yellow, yellow, pink, or pinkish red.
 Density: 2.97 - 3, Average = 2.98
 Diaphaniety: Transparent to subtranslucent
 Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
 Habits: Massive - Fibrous - Distinctly fibrous fine-grained forms., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
 Hardness: 7.5-8
 Luminescence: Non-fluorescent.
 Luster: Vitreous (Glassy)
 Streak: white
 

Optical Properties

 Optical Data: Uniaxial (+), w=1.654, e=1.67, bire=0.0160.
 

Classification

 Dana Class: Nesosilicate Insular SiO4 Groups Only
  with cations in [4] coordination
  Phenakite group
 
 Phenakite Be2SiO4 R3- -3
 
 Willemite Zn2SiO4 R3- -3
 
 Eucryptite LiAlSiO4 R3- -3
 Strunz Class:  Silicates
   Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4]
   STRUNZ  - Silicates [Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4] {Phenakite series}]
 
Phenakite Be2SiO4 R3- -3
 
 Willemite Zn2SiO4 R3- -3
 
 Eucryptite LiAlSiO4 R3-
 
 
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