General Melilite Information![]() (Ca,Na)2(Al,Mg,Fe++)(Si,Al)2O7 |
![]() Molecular Weight = 268.29 gm |
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Sodium 4.28 % Na 5.78 % Na2O |
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Calcium 22.41 % Ca 31.35 % CaO |
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Magnesium 2.72 % Mg 4.51 % MgO |
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Aluminum 11.06 % Al 20.90 % Al2O3 |
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Iron 2.08 % Fe 2.68 % FeO |
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Silicon 15.70 % Si 33.59 % SiO2 |
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Oxygen 41.74 % O |
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100.00 % 98.81 % = TOTAL OXIDE |
![]() Ca1.5Na0.5Al1.1Mg0.3Fe2+0.1Si1.5O7 |
![]() Igneous rocks poor in silica and alkalis. |
![]() Valid Species (Pre-IMA) 1796 |
![]() Capo di Bove, near Rome, Italy. Link to MinDat.org Location Data. |
![]() From the Greek, meli - "honey" and lithos - "stone." |
![]() Melilite |
![]() | | Melilite Image
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Melilite Crystallography![]() a:c = 1:0.66092 |
![]() a = 7.715, c = 5.099, Z = 2; V = 303.50 Den(Calc)= 2.94 |
![]() Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: P 421m |
![]() By Intensity(I/Io): 2.8577(1), 1.7619(0.27), 3.0791(0.24), |
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| Physical Properties of Melilite![]() {001} Distinct, {100} Indistinct |
![]() White, Yellowish white, Brown, Gray, Greenish gray. |
![]() 2.9 - 3, Average = 2.95 |
![]() Translucent |
![]() Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
![]() Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
![]() Massive - Lamellar - Distinctly foliated fine-grained forms. |
![]() 5-5.5 - Apatite-Knife Blade |
![]() Non-fluorescent. |
![]() Vitreous - Greasy |
![]() white |
| Optical Properties of Melilite![]() colorless or light yellow. |
![]() colorless or dark yellow. |
![]() 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 ![]() Uniaxial (-), e=1.626-1.658, w=1.632-1.669, bire=0.0060-0.0110. |
| Calculated Properties of Melilite![]() Bulk Density (Electron Density)=2.92 gm/cc |
note: Specific Gravity of Melilite =2.95 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEMelilite = 4.43 barns/electron |
U=PEMelilite x rElectron Density= 12.95 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Melilite is Not Radioactive | Melilite Classification![]() 55.04.01.03 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions |
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(55.04)with cations in [8] and lower coordination |
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(55.04.01)Melilite group |
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![]() 09.BB.10 09 - SILICATES (Germanates) |
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09.B - Sorosilicates |
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09.BB -Si2O7 groups, without non-tetrahedral anions; |
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| Other Melilite Information![]() NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
![]() 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 14 - WWW-MINCRYST Search for Melilite using: Visit our Advertisers for Melilite : A Bijoux Google Search for MeliliteAdam's Minerals Google Search for Melilite Cape Minerals Google Search for Melilite Dakota Matrix Minerals Google Search for Melilite Excalibur Mineral Corp. Google Search for Melilite Exceptional Minerals Google Search for Melilite John Betts Fine Minerals Search for Melilite McDougall Minerals Google Search for Melilite Mineral News Website Link Rock and Mineral Shows Google Search for Melilite Weinrich Minerals, Inc. Google Search for Melilite Ask about Melilite here : Print or Cut-and-Paste your Melilite Specimen Label here :
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