PHENAKITE                                 NATURAL COLOR                  Hardness 7.5

 

   15.69 cts. Phenakite emerald cut  single 

 14.1x 13.5 mm.

 Eye clean. Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHwe 1569 

 

  Enlarge 11.77 cts. Phenakite oval  single 

20.5 x 10.9 mm. Depth: 7.4 mm.

 Eye clean. Enhancement: none (N)

stone PRICE  

USD  1270.00 

ORIGIN: Madagascar

ref: PHwo 1177 

 

Enlarge 8.15 cts. Phenakite oval  single 

15.4 x 10.8 mm. Depth: 7.1 mm.

 Eye clean. Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHwo 815 

 

   4.38 cts. Phenakite oval    single 

 11.9 x 9.4 mm.

 Eye clean. Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref:PHo438  

 

0.53 cts. Phenakite oval  single 

5.5 x 4.8 mm. ( sugf cut )

 Eye clean. Enhancement: none (N)

stone PRICE  

 SOLD 

ORIGIN: Madagascar

ref: PHwo053  

To purchase a stone from this site click to ORDER                    Phenakite crystal

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 crystal of Phenakite

 

 

  Click on the picture to go to    Phenakite crystal.
    Image by A. Darbellay

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)
 Forms:
 

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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