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Akermanite Mineral Data

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General Akermanite Information

Help on Chemical  Formula: Chemical Formula: Ca2MgSi2O7
Help on Composition: Composition: Molecular Weight = 272.63 gm
   Calcium    29.40 %  Ca   41.14 % CaO
   Magnesium   8.92 %  Mg   14.78 % MgO
   Silicon    20.60 %  Si   44.08 % SiO2
   Oxygen     41.08 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mg(Si2O7)
Help on Environment: Environment: A product of contact metamorphism of siliceous limestones and dolostones, and in rocks of the sanidinite facies. Also, forms from alkalic magmas rich in calcium.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1884
Help on Locality: Locality: Occurrences are typically of intermediate series members; relatively pure examples have been found at Monte Somma and Vesuvius, Campania, and Monte Cavalluchio, Sacrofano, near Rome, L Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Anders Richard Akerman (1837-1922), Swedish metallurgist.
Help on Name Pronunciation: Name Pronunciation: Akermanite + Pronunciation Say AKERMANITE
Help on Synonym: Synonym: ICSD 39924
  PDF 35-592
 

Akermanite Image

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  Akermanite

Comments: White translucent crystals akermanite.
Location: Lago de Vico, Viterbo, Lazio, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Akermanite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.63903
Help on Cell Dimensions: Cell Dimensions: a = 7.84, c = 5.01, Z = 2; V = 307.94 Den(Calc)= 2.94
Help on Crystal System: Crystal System: Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: P 421m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.87(1), 1.76(0.3), 3.09(0.3),
 

Physical Properties of Akermanite

Help on Cleavage: Cleavage: {001} Distinct, {110} Indistinct
Help on Color: Color: Colorless, Grayish, Green, Brown.
Help on Density: Density: 2.944
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white
 

Optical Properties of Akermanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2163,KPDmeas= 0.216,KC= 0.2076
Ncalc = 1.61
Help on Optical Data: Optical Data: Uniaxial (+), w=1.632, e=1.64, bire=0.0080.
 

Calculated Properties of Akermanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Akermanite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAkermanite = 4.59 barns/electron
U=PEAkermanite x rElectron Density= 13.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Akermanite is Not Radioactive
 

Akermanite Classification

Help on  Dana Class: Dana Class: 55.04.01.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.01)Melilite group
 
55.04.01.01 Akermanite Ca2MgSi2O7 P 421m 4 2m
 
55.04.01.02 Gehlenite Ca2Al(AlSi)O7 P 421m 4 2m
 
55.04.01.03 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 421m 4 2m
 
55.04.01.04 Okayamalite! Ca2B2SiO7 P 421m 4 2m
 
55.04.01.05 Alumoakermanite! (Ca,Na)2(Al,Mg,Fe)(Si2O7) P 421m 4 2m
Help on  Strunz Class: Strunz Class: 09.BB.10 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BB -Si2O7 groups, without non-tetrahedral anions;
 
09.BB.10 Akermanite Ca2MgSi2O7 P 421m 4 2m
 
09.BB.10 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho
 
09.BB.10 Gugiaite Ca2BeSi2O7 P 421m 4 2m
 
09.BB.10 Gehlenite Ca2Al(AlSi)O7 P 421m 4 2m
 
09.BB.10 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2
 
09.BB.10 Hardystonite Ca2ZnSi2O7 P 421m 4 2m
 
09.BB.10 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 421m 4 2m
 
09.BB.10 Okayamalite! Ca2B2SiO7 P 421m 4 2m
 

Other Akermanite 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 Akermanite :
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 - University of Colorado - Mineral Structure Data
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Akermanite Specimen Label here :

Akermanite

Ca2MgSi2O7
Dana No: 55.04.01.01 Strunz No: 09.BB.10
Locality:

 

Notes:

 

 
   
 


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