Magadiite Mineral Data (original) (raw)

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

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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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Help on Above

| | 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
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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: