Makatite Mineral Data

Makatite Mineral Data
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General Makatite Information

Help on Chemical Formula: Chemical Formula: Na2Si4O8(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 392.39 gm
   Sodium    11.72 %  Na   15.80 % Na2O
   Silicon   28.63 %  Si   61.25 % SiO2
   Hydrogen   2.57 %  H    22.96 % H2O
   Oxygen    57.08 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Si4O8(OH)2•4(H2O)
Help on Environment: Environment: Continental evaporite deposits. Forms pseudomorphs after trona.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Lake Magadi, Kenya. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Masai "emakat," soda, in allusion to the high sodium content.
Help on Name Pronunciation: Name Pronunciation: Makatite Say MAKATITE
Help on Synonym: Synonym: ICSD 17057
  PDF 23-703
 

Makatite Image

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Makatite

Comments: Thin white bladed crystals of makatite.
Location: Aris Phonolite, S. of Windhoek, Namibia. Scale: 5.5 x 3 cm.
© John Veevaert
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Makatite

Comments: White acicular sprays of makatite crystals in a vug with pink villiaumite.
Location: Aris Phonolite, Namibia. Scale: Picture size 2 cm.
© Sandro Maggia/Minernet.it

Makatite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4083:1:0.5263
Help on Cell Dimensions: Cell Dimensions: a = 7.3881, b = 18.094, c = 9.5234, Z = 4; beta = 90.64° V = 1,273.01 Den(Calc)= 2.05
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.09(1), 2.97(0.57), 9.04(0.53),
Click Here for Large Makatite Structure Window Crystal Structure:

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Annehed H , Faelth L , Lincoln F J , Zeitschrift fur Kristallographie , 159 (1982) p.203-210, Crystal structure of synthetic makatite Na2Si4O8(OH)2(H2O)4

 

Physical Properties of Makatite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.072
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Luminescence: Luminescence: Fluorescent, Short UV=pale green, Long UV=yellow-white.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white
 

Optical Properties of Makatite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2345,KPDmeas= 0.232,KC= 0.2355
Ncalc = 1.48 - 1.49
Help on Optical Data: Optical Data: Biaxial (+), a=1.472-1.475, b=1.48, g=1.487-1.49, bire=0.0150
 

Calculated Properties of Makatite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Makatite =2.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMakatite = 1.34 barns/electron
U=PEMakatite x rElectron Density= 2.80 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Makatite is Not Radioactive
 

Makatite Classification
Help on Dana Class: Dana Class: 74.03.05.02 (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.05)Na phyllosilicates
 
74.03.05.01 Natrosilite Na2Si2O5 P 21/a 2/m
 
74.03.05.02 Makatite Na2Si4O8(OH)2•4(H2O) P 21/c 2/m
 
74.03.05.03 Silinaite NaLiSi2O5•2(H2O) A2/n 2/m
 
74.03.05.04 Searlesite NaBSi2O5(OH)2 P 21 2
Help on Strunz Class: Strunz Class: 09.EE.45 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
 
09.EE.45 Makatite Na2Si4O8(OH)2•4(H2O) P 21/c 2/m
 

Other Makatite 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 Makatite :
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
17 - WWW-MINCRYST

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

Makatite

Na2Si4O8(OH)2•4(H2O)
Dana No: 74.03.05.02 Strunz No: 09.EE.45
Locality:

 

Notes: