Magadiite Mineral Data

Magadiite Mineral Data
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General Magadiite Information

Help on Chemical Formula: Chemical Formula: NaSi7O13(OH)3•4(H2O)
Help on Composition: Composition: Molecular Weight = 550.66 gm
   Sodium     4.17 %  Na    5.63 % Na2O
   Silicon   35.70 %  Si   76.38 % SiO2
   Hydrogen   2.01 %  H    17.99 % H2O
   Oxygen    58.11 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaSi7O13(OH)3•4(H2O)
Help on Environment: Environment: Associated with other rare alkalic minerals in brines with high Ph and silica content.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Lake Magadi, Olduvai Gorge, Kenya. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Magadiite + Pronunciation Say MAGADIITE
 

Magadiite Image

Click Here for Larger Magadiite Image in a New Browser Window Images:
Click Here for Larger Magadiite Image

Magadiite   Rhodesite

Comments: Earth pale tan massive magadiite with dark yellow crystalline rhodesite.
Location: East Fork, Trinity River, Trinity County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magadiite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1:1:2.1641
Help on Cell Dimensions: Cell Dimensions: a = 7.25, b = 7.25, c = 15.69, Z = 2; beta = 96.8° V = 818.90 Den(Calc)= 2.23
Help on Crystal System: Crystal System: MonoclinicSpace Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 15.41(1), 3.435(0.8), 3.146(0.5),
Click Here for Large Magadiite Structure Window Crystal Structure:

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Garces J M , Rocke S C , Crowder C E , Hasha D L , Clays and Clay Minerals , 36 (1988) p.409-418, Hypothetical structures of magadiite and sodium octosilicate and structural, relationships between the layered alkali metal silicates and the mordenite- and, pentasil-group zeolites, Note: hypothetical model structure, Note: setting changed from left- to right-handed

 

Physical Properties of Magadiite

Help on Color: Color: White.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Powdery - Forms a loose, poorly-coherent pulverulent mass.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow-white, Long UV=yellow-white.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white
 

Optical Properties of Magadiite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KC= 0.2307
Ncalc = 1.51
Help on Optical Data: Optical Data: Biaxial (?), a=1.47
 

Calculated Properties of Magadiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Magadiite =2.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMagadiite = 1.48 barns/electron
U=PEMagadiite x rElectron Density= 3.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magadiite is Not Radioactive
 

Magadiite Classification
Help on Dana Class: Dana Class: 78.07.12.01 (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.12)Dana Group
 
78.07.12.01 Magadiite NaSi7O13(OH)3•4(H2O) Unk Mono
Help on Strunz Class: Strunz Class: 09.EA.20 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
 
09.EA.20 Magadiite NaSi7O13(OH)3•4(H2O) Unk Mono
 

Other Magadiite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Magadiite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Ask about Magadiite 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
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Magadiite

NaSi7O13(OH)3•4(H2O)
Dana No: 78.07.12.01 Strunz No: 09.EA.20
Locality:

 

Notes: