Mineralogy Database

Phenakite Mineral Data

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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 - "deceiver", in allusion to its similarity to quartz when colorless.
Help on Name Pronunciation: Name Pronunciation: Phenakite + Pronunciation Say PHENAKITE
Help on Synonym: Synonym: ICSD 64949
  PDF 9-431

Phenakite Image

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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 - Rhombohedral H-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:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 2 1 0) ( 1 2 0)

Warning: this java applet does not work in some browsers because of security restrictions.


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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.66 - 1.67
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: Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Phenakite =2.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.17
Boson Index = 0.83
Help on Photoelectric: Photoelectric: PEPhenakite = 1.14 barns/electron
U=PEPhenakite x rElectron Density= 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)Nesosilicate Insular SiO4 Groups Only
  (51.01)with cations in [4] coordination
  (51.01.01)Phenakite group Phenakite Be2SiO4 R 3 3 Willemite Zn2SiO4 R 3 3 Eucryptite LiAlSiO4 R 3 3
Help on  Strunz Class: Strunz Class: 09.AA.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AA -Nesosilicates without additional anions;
09.AA.05 Eucryptite LiAlSiO4 R 3 3
09.AA.05 Phenakite Be2SiO4 R 3 3
09.AA.05 Willemite Zn2SiO4 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 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Scandinavian mineral gallery
15 - Tradeshop.com - The Rainbow of Gems

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Dana No: Strunz No: 09.AA.05





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