Mineralogy Database

Melilite Mineral Data

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General Melilite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)2(Al,Mg,Fe++)(Si,Al)2O7
Help on Composition: Composition: Molecular Weight = 268.29 gm
   Sodium      4.28 %  Na    5.78 % Na2O
   Calcium    22.41 %  Ca   31.35 % CaO
   Magnesium   2.72 %  Mg    4.51 % MgO
   Aluminum   11.06 %  Al   20.90 % Al2O3
   Iron        2.08 %  Fe    2.68 % FeO
   Silicon    15.70 %  Si   33.59 % SiO2
   Oxygen     41.74 %  O
             ______        ______ 
             100.00 %       98.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.5Na0.5Al1.1Mg0.3Fe2+0.1Si1.5O7
Help on Environment: Environment: Igneous rocks poor in silica and alkalis.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1796
Help on Locality: Locality: Capo di Bove, near Rome, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, meli - "honey" and lithos - "stone."
Help on Name Pronunciation: Name Pronunciation: Melilite Say MELILITE

Melilite Image

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Comments: Barrel-shaped root-beer colored melilite crystal with clear nepheline.
Location: Udersdorf, Rhineland-Palatinate, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Monticellite   Melilite

Comments: Thin-section image of monticellite interstitial between unaltered melilite crystals (CanMin v. 41. p 1259).
Location: Skarns along the contact of a diorite intrusion at OravitÂļa, Banat, in Romania. Scale: Field of View 2.7 mm.
© Canadian Mineralogist

Melilite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.66092
Help on Cell Dimensions: Cell Dimensions: a = 7.715, c = 5.099, Z = 2; V = 303.50 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): 2.8577(1), 1.7619(0.27), 3.0791(0.24),

Physical Properties of Melilite

Help on Cleavage: Cleavage: {001} Distinct, {100} Indistinct
Help on Color: Color: White, Yellowish white, Brown, Gray, Greenish gray.
Help on Density: Density: 2.9 - 3, Average = 2.95
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Melilite

Help on Dichroism (e): Dichroism (e): colorless or light yellow.
Help on Dichroism (w): Dichroism (w): colorless or dark yellow.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.074 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KPDmeas= 0.2191,KC= 0.204
Ncalc = 1.59 - 1.61
Help on Optical Data: Optical Data: Uniaxial (-), e=1.626-1.658, w=1.632-1.669, bire=0.0060-0.0110.

Calculated Properties of Melilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Melilite =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMelilite = 4.43 barns/electron
U=PEMelilite x rElectron Density= 12.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melilite is Not Radioactive

Melilite Classification

Help on  Dana Class: Dana Class: (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.01)Melilite group Akermanite Ca2MgSi2O7 P 421m 4 2m Gehlenite Ca2Al(AlSi)O7 P 421m 4 2m Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 421m 4 2m Okayamalite! Ca2B2SiO7 P 421m 4 2m 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 Melilite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Melilite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - University of Colorado - Mineral Structure Data

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Dana No: Strunz No: 09.BB.10





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