Nacrite Mineral Data

Nacrite Mineral Data
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General Nacrite Information

Help on Chemical Formula: Chemical Formula: Al2Si2O5(OH)4
Help on Composition: Composition: Molecular Weight = 258.16 gm
   Aluminum  20.90 %  Al   39.50 % Al2O3
   Silicon   21.76 %  Si   46.55 % SiO2
   Hydrogen   1.56 %  H    13.96 % H2O
   Oxygen    55.78 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2Si2O5(OH)4
Help on Environment: Environment: May be the same as kaolinite or dickite. Hydrothermal origin.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1807
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the French, nacre, "mother-of-pearl."
Help on Name Pronunciation: Name Pronunciation: Nacrite Say NACRITE
 

Nacrite Image

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Nacrite

Comments: Colorless, transparent crystal of macrite on matrix.
Location: Hunersedge mine, Baden-Wurttemburg, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nacrite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.7312:1:3.0503
Help on Cell Dimensions: Cell Dimensions: a = 8.909, b = 5.146, c = 15.697, Z = 4; beta = 113.7° V = 658.95 Den(Calc)= 2.60
Help on Crystal System: Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.187(1), 3.593(0.53), 4.383(0.39),
Click Here for Large Nacrite Structure Window Crystal Structure:

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Zheng H , Bailey S W , Clays and Clay Minerals , 42 (1994) p.46-52, Refinement of the nacrite structure, Locality: Red Mountain near Silverton, Colorado, USA

 

Physical Properties of Nacrite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, White, Yellowish, Brownish.
Help on Density: Density: 2.6
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 1 - Talc
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Nacrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2156,KPDmeas= 0.2156,KC= 0.226
Ncalc = 1.59
Help on Optical Data: Optical Data: Biaxial (-), a=1.557, b=1.562, g=1.563, bire=0.0060, 2V(Calc)=48, 2V(Meas)=40.
 

Calculated Properties of Nacrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Nacrite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PENacrite = 1.48 barns/electron
U=PENacrite x rElectron Density= 3.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nacrite is Not Radioactive
 

Nacrite Classification
Help on Dana Class: Dana Class: 71.01.01.03 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.01)Kaolinite group
 
71.01.01.01 Dickite Al2Si2O5(OH)4 Cc m
 
71.01.01.02 Kaolinite Al2Si2O5(OH)4 P1 1
 
71.01.01.03 Nacrite Al2Si2O5(OH)4 Cc m
 
71.01.01.04 Halloysite Al2Si2O5(OH)4 Cc m
 
71.01.01.04a Endellite? Al2Si2O5(OH)4•2(H2O) Cc m
 
71.01.01.05 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m
Help on Strunz Class: Strunz Class: 09.ED.05 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
 
09.ED.05 Dickite Al2Si2O5(OH)4 Cc m
 
09.ED.05 Kaolinite Al2Si2O5(OH)4 P1 1
 
09.ED.05 Nacrite Al2Si2O5(OH)4 Cc m
 

Other Nacrite Information
Help on References: References: NAME( Duda&Rejl90) 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 Nacrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Nacrite

Al2Si2O5(OH)4
Dana No: 71.01.01.03 Strunz No: 09.ED.05
Locality:

 

Notes: