Mellite Mineral Data

Mellite Mineral Data
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General Mellite Information

Help on Chemical Formula: Chemical Formula: Al2[C6(COO)6]•16(H2O)
Help on Composition: Composition: Molecular Weight = 534.47 gm
   Aluminum  10.10 %  Al   19.08 % Al2O3
   Hydrogen   9.05 %  H    80.90 % H2O
   Carbon    26.97 %  C
   Oxygen    53.88 %  O
            ______        ______ 
            100.00 %       99.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2C12H12•18(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1793
Help on Locality: Locality: Arten, Thüringen, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin mel - "honey."
Help on Name Pronunciation: Name Pronunciation: Mellite Say MELLITE
Help on Synonym: Synonym: ICSD 41122
  PDF 42-1501
 

Mellite Image

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Mellite

Comments: Specimen of crystalline mellite. Mellite is a naturally occurring organic mineral species.
Location: Csordakhut, Tatabanya, Hungary. Scale: 4 x 3 cm.
© John Veevaert

Mellite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.05887
Help on Cell Dimensions: Cell Dimensions: a = 21.91, c = 23.2, Z = 16; V = 11,137.12 Den(Calc)= 1.27
Help on Crystal System: Crystal System: Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: P 4122,P 4322
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.99(1), 4.23(0.7), 5.8(0.55),
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Robl C , Kuhs W F , Journal of Solid State Chemistry , 92 (1991) p.101-109, A neutron diffraction study on hydrogen bonding in the mineral mellite (Al2[C6(COO)6]*16H2O) at 15 K, Sample: T = 15 K, Locality: Tatabanya, Hungary

 

Physical Properties of Mellite

Help on Cleavage: Cleavage: {011} Imperfect
Help on Color: Color: Brown, Brownish white, Colorless, Yellow, Golden brown.
Help on Density: Density: 1.55 - 1.65, Average = 1.6
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: Fluorescent and Phosphorescent, Short UV=blue, Long UV=blue.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Mellite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.314 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.4134,KPDmeas= 0.3281,KC= 0.3145
Ncalc = 1.4 - 1.52
Help on Optical Data: Optical Data: Uniaxial (-), e=1.511, w=1.539, bire=0.0280.
 

Calculated Properties of Mellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.74 gm/cc
note: Specific Gravity of Mellite =1.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0032386455
Boson Index = 0.9967613545
Help on Photoelectric: Photoelectric: PEMellite = 0.49 barns/electron
U=PEMellite x rElectron Density= 0.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mellite is Not Radioactive
 

Mellite Classification
Help on Dana Class: Dana Class: 50.02.01.01 (50)Salts of Organic Acids
  (50.02)(Mellitates, Citrates, Cyanates, and Acetates)
  (50.02.01)Dana Group
 
50.02.01.01 Mellite Al2[C6(COO)6]•16(H2O) P 4122,P 4322 4 2 2
Help on Strunz Class: Strunz Class: 10.AC.05 10 - ORGANIC COMPOUNDS
  10.A - Salts of Organic Acids
  10.AC -Benzene Salts
 
10.AC.05 Mellite Al2[C6(COO)6]•16(H2O) P 4122,P 4322 4 2 2
 

Other Mellite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Mellite :
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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Ask about Mellite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Mellite Specimen Label here :

Mellite

Al2[C6(COO)6]•16(H2O)
Dana No: 50.02.01.01 Strunz No: 10.AC.05
Locality:

 

Notes: