Makatite Mineral Data + Say MAKATITE


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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 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.
© Minernet

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 Diaphaniety: Diaphaniety: Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
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
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:

relectron=2.09 gm/cc
note: rMakatite =2.05 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01364
Boson Index = 0.98636
Help on Photoelectric: Photoelectric:

PEMakatite = 1.34 barns/electron
U=PEMakatite x relectron= 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: 74.3.5.2 (74)Phyllosilicate Modulated Layers
  (74.3)with joined strips
  (74.3.5)Na phyllosilicates
 
74.3.5.1 Natrosilite Na2Si2O5 P 21/a 2/m
 
74.3.5.2 Makatite Na2Si4O8(OH)2·4(H2O) P 21/c 2/m
 
74.3.5.3 Silinaite NaLiSi2O5·2(H2O) A2/n 2/m
 
74.3.5.4 Searlesite NaBSi2O5(OH)2 P 21 2
Help on Strunz Class: Strunz Class: VIII/G.05-20 VIII - Silicates
  VIII/G - Intermediate between chain- and layered silicates
  VIII/G.05 - Silinaite - Makatite series
 
VIII/G.05-05 Silinaite NaLiSi2O5·2(H2O) A2/n 2/m
 
VIII/G.05-10 Searlesite NaBSi2O5(OH)2 P 21 2
 
VIII/G.05-20 Makatite Na2Si4O8(OH)2·4(H2O) P 21/c 2/m
 

Other Makatite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) 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 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris

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Makatite

Na2Si4O8(OH)2·4(H2O)
Dana No: 74.3.5.2 Strunz No: VIII/G.05-20
Locality:

 

Notes:

 
 
   
 
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