Phenakite Mineral Data + Say PHENAKITE


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General Phenakite Information

Help on Chemical  Formula: Chemical Formula: Be2SiO4
Help on Composition: Composition: Molecular Weight = 110.11 gm
   Beryllium  16.37 %  Be   45.43 % BeO
   Silicon    25.51 %  Si   54.57 % SiO2
   Oxygen     58.12 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Be2(SiO4)
Help on Environment: Environment: Alpine fissures, pegmatites, and hydrothermally altered rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1833
Help on Locality: Locality: Takovaya, Ekaterinburg (Sverdlovsk), Ural Mts, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek phenakos - "ldeceiver", in allusion to its similarity to quartz when colorless.
Help on Synonym: Synonym: ICSD 64949
  PDF 9-431
 

Phenakite Image

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Phenakite

Comments: Prismatic, terminated crystal of phenakite on matrix.
Location: Mt Antero, Chaffee County, Colorado, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Phenakite Crystallography

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

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Forms: [ 1 1 1] [ 2 1 0] [ 1 2 0]

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Downs J W , Gibbs G V , American Mineralogist , 72 (1987) p.769-777, An exploratory examination of the electron density and electrostatic potential, of phenakite

View Additional jPOWD Structure files for Phenakite
[1] [2] [3] [4] [5] [6] [7] [8]
 

Physical Properties of Phenakite

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

Optical Properties of Phenakite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2236,KPDmeas= 0.2218,KC= 0.2225
Help on Optical Data: Optical Data: Uniaxial (+), w=1.654, e=1.67, bire=0.0160.
 

Calculated Properties of Phenakite

Help on Electron Density: Electron Density:

relectron=2.93 gm/cc
note: rPhenakite =2.99 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.17588
Boson Index = 0.82412
Help on Photoelectric: Photoelectric:

PEPhenakite = 1.14 barns/electron
U=PEPhenakite x relectron= 3.33 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Phenakite is Not Radioactive

 

Phenakite Classification

Help on  Dana Class: Dana Class: 51.1.1.1 (51)Nesosilicate Insular SiO4 Groups Only
  (51.1)with cations in [4] coordination
  (51.1.1)Phenakite group
 
51.1.1.1 Phenakite Be2SiO4 R 3 3
 
51.1.1.2 Willemite Zn2SiO4 R 3 3
 
51.1.1.3 Eucryptite LiAlSiO4 R 3 3
Help on  Strunz Class: Strunz Class: VIII/A.01-10 VIII - Silicates
  VIII/A - Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4]
  VIII/A.01 - Phenakite series
 
VIII/A.01-10 Phenakite Be2SiO4 R 3 3
 
VIII/A.01-20 Willemite Zn2SiO4 R 3 3
 
VIII/A.01-30 Eucryptite LiAlSiO4 R 3 3
 

Other Phenakite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Phenakite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 - Minerals of Wisconsin 15 -QUT Mineral Atlas 16 - Scandinavian mineral gallery 17 - Tradeshop.com - The Rainbow of Gems 18 - WWW-MINCRYST

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Phenakite

Be2SiO4
Dana No: 51.1.1.1 Strunz No: VIII/A.01-10
Locality:

 

Notes:

 

 
   
 
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