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Aenigmatite Mineral Data

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General Aenigmatite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)4(Fe++,Ti,Mg)12Si12O40
Help on Composition: Composition: Molecular Weight = 1,717.59 gm
   Sodium      4.99 %  Na    6.73 % Na2O
   Calcium     0.77 %  Ca    1.08 % CaO
   Magnesium   0.65 %  Mg    1.08 % MgO
   Zirconium   0.05 %  Zr    0.07 % ZrO2
   Titanium    5.85 %  Ti    9.77 % TiO2
   Manganese   1.28 %  Mn    1.65 % MnO
   Aluminum    1.01 %  Al    1.90 % Al2O3
   Zinc        0.04 %  Zn    0.05 % ZnO
   Iron       29.95 %  Fe   35.76 % FeO /  3.07 % Fe2O3
   Silicon    18.15 %  Si   38.83 % SiO2
   Oxygen     37.26 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3.73Ca0.27Fe2+8.55Ti2.1Mg0.46Fe3+0.4Mn2+0.4Ca0.06Zn0.01Zr0.01Si11.1Al0.64Fe3+0.26O40
Help on Environment: Environment: A primary constituent in sodium-rich alkalic volcanics, pegmatites, and other silica-poor igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1865
Help on Locality: Locality: Notable studied occurrences include: at Naujakasik, near the Tunugdliarfik Fjord, and on the Kangerdluarssuk Plateau, in the Ilimaussaq intrusion; from Narssarssuk; and elsewhere in Gr Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for riddle, apparently an allusion to its (formerly) uncertain chemical composition.
Help on Name Pronunciation: Name Pronunciation: Aenigmatite + Pronunciation Say AENIGMATITE
Help on Synonym: Synonym: Cossyrite
  ICSD 15283
  PDF 46-1473

Aenigmatite Image

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Comments: Dark, crystal prism of aenigmatite in white albite with astrophyllite.
Location: Mount Eveslogchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aenigmatite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9607:1:0.8238
Help on Cell Dimensions: Cell Dimensions: a = 10.415, b = 10.84, c = 8.931, Z = 1; alpha = 105.107°, beta = 96.61°, gamma = 125.398° V = 788.23 Den(Calc)= 3.62
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 8.11(1), 2.705(0.8),

Physical Properties of Aenigmatite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Brown, Black.
Help on Density: Density: 3.74 - 3.85, Average = 3.79
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: reddish brown

Optical Properties of Aenigmatite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2168,KPDmeas= 0.2183,KC= 0.2207
Ncalc = 1.83 - 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.78-1.8, b=1.8-1.82, g=1.87-1.9, bire=0.0900-0.1000, 2V(Calc)=56-60, 2V(Meas)=27-55. Dispersion single.
Help on Pleochroism (x): Pleochroism (x): light brown.
Help on Pleochroism (y): Pleochroism (y): brown.
Help on Pleochroism (z): Pleochroism (z): dark brown.

Calculated Properties of Aenigmatite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Aenigmatite =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEAenigmatite = 11.27 barns/electron
U=PEAenigmatite x rElectron Density= 41.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aenigmatite is Not Radioactive

Aenigmatite Classification

Help on  Dana Class: Dana Class: 69.02.01a.01 (69)Inosilicate Chains with Side Branches or Loops
  (69.02)with P>2
  (69.02.01a)Aenigmatite and related species (Aenigmatite subgroup)
69.02.01a.01 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1
69.02.01a.02 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
69.02.01a.03 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1
69.02.01a.04 Krinovite NaMg2CrSi3O10 P1 1
69.02.01a.05 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
69.02.01a.06 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
69.02.01a.07 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1
69.02.01a.08 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1
69.02.01a.09 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1
Help on  Strunz Class: Strunz Class: 09.DH.45 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1
09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
09.DH.45 Krinovite NaMg2CrSi3O10 P1 1
09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1
09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1
09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

Other Aenigmatite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Dana8, AmMin v94:650) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Aenigmatite :
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

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Dana No: 69.02.01a.01 Strunz No: 09.DH.45





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