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Makatite

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Aris Quarries (Ariskop Quarry; Railway Quarry), Aris, Windhoek, Windhoek District, Khomas Region, Namibia
© jo-esche 2008

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Formula:
Na
 
2
Si
 
4
O
 
8
(OH)
 
2
·4H
 
2
O
System:MonoclinicColour:white
Name:From "emakut", Masai word for "soda", in allusion to the high sodium content of the mineral
This page provides mineralogical data about Makatite.

Classification of Makatite

IMA status:Approved 1969
Strunz 8th edition ID:8/G.05-20
Nickel-Strunz 10th (pending) edition ID:9.EE.45

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
Dana 8th edition ID:74.3.5.2

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
Hey's CIM Ref.:14.1.4

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals
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Type Occurrence of Makatite

Type Locality:Lake Magadi, South Rift Valley, Rift Valley Province, Kenya

Physical Properties of Makatite

Colour:white
Cleavage:Perfect
Parellel to longitudinal axis
Density (measured):1.97 - 2.07 g/cm3
Density (calculated):2.05 g/cm3

Crystallography of Makatite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a}
Cell Parameters:a = 7.388Å, b = 18.094Å, c = 9.523Å
β = 90.64°
Ratio:a:b:c = 0.408 : 1 : 0.526
Unit Cell Volume:V 1,272.94 ų (Calculated from Unit Cell)
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
5.09 (100)
2.997 (60)
9.04 (55)
2.883 (40)
3.410 (40)
3.125 (35)
Comments:Lake Magadi, Kenya

Optical Data of Makatite

Type:Biaxial (+)
RI values: nα = 1.472 - 1.475 nβ = 1.480 nγ = 1.487 - 1.490
2V:Measured: 70°
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Makatite

Formula:
Na
 
2
Si
 
4
O
 
8
(OH)
 
2
·4H
 
2
O
Essential elements:H, Na, O, Si
All elements listed in formula:H, Na, O, Si
Common Impurities:Ti,Al,Fe,Mg,Ca,K

Relationship of Makatite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EE.05Bementite
Mn
 
5
Si
 
4
O
 
10
(OH)
 
6
9.EE.10Brokenhillite
9.EE.10Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
9.EE.10Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
9.EE.10Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
9.EE.10Mcgillite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH)
 
8
Cl
 
2
9.EE.15Nelenite
(Mn,Fe)
 
16
Si
 
12
As
 
3
O
 
36
(OH)
 
17
9.EE.15Schallerite
(Mn,Fe)
 
16
Si
 
12
As
 
3
O
 
36
(OH)
 
17
9.EE.20Palygorskite
(Mg,Al)
 
5
(Si,Al)
 
8
O
 
20
(OH)
 
2
·8H
 
2
O
9.EE.20Tuperssuatsiaite
Na
 
2
Fe
 
3
Si
 
8
O
 
20
(OH)
 
2
·4H
 
2
O
9.EE.20Yofortierite
Mn
 
5
Si
 
8
O
 
20
(OH)
 
2
·8-9H
 
2
O
9.EE.25Falcondoite
(Ni,Mg)
 
4
Si
 
6
O
 
15
(OH)
 
2
·6H
 
2
O
9.EE.25Loughlinite
Na
 
2
Mg
 
3
Si
 
6
O
 
16
·8H
 
2
O
9.EE.25Sepiolite
Mg
 
4
Si
 
6
O
 
15
(OH)
 
2
·6H
 
2
O
9.EE.25Kalifersite
(K,Na)
 
5
Fe
3+
7
Si
 
20
O
 
50
(OH)
 
6
·12H
 
2
O
9.EE.30Gyrolite
Ca
 
4
(Si
 
6
O
 
15
)(OH)
 
2
·3H
 
2
O
9.EE.30Orlymanite
Ca
 
4
Mn
 
3
Si
 
8
O
 
20
(OH)
 
6
·2H
 
2
O
9.EE.30Tungusite
Ca
 
4
Fe
 
2
Si
 
6
O
 
15
(OH)
 
6
9.EE.35Fedorite
KNa
 
4
Ca
 
4
[HSi
 
4
O
 
10
]
 
4
 · 6H
 
2
O
9.EE.35Minehillite
(K,Na)
 
2-3
Ca
 
28
Zn
 
4
Al
 
4
Si
 
40
O
 
112
(OH)
 
16
9.EE.35Reyerite
(Na,K)
 
2
Ca
 
14
(Si,Al)
 
24
O
 
58
(OH)
 
8
·6H
 
2
O
9.EE.35Truscottite
(Ca,Mn)
 
14
Si
 
24
O
 
58
(OH)
 
8
·2H
 
2
O
9.EE.35Martinite
(Na,Ca)
 
11
Ca
 
4
(Si,S,B)
 
14
B
 
2
O
 
40
F
 
2
·4H
 
2
O
9.EE.35Lalondeite
(Na,Ca)
 
6
(Ca,Na)
 
3
Si
 
16
O
 
38
(F,OH)
 
2
·3H
 
2
O
9.EE.40Natrosilite
Na
 
2
Si
 
2
O
 
5
9.EE.50Varennesite
Na
 
8
Mn
 
2
Si
 
10
O
 
25
(OH,Cl)
 
2
·12H
 
2
O
9.EE.55Raite
(Na,Ca)
 
4
(Mn,Ti,Fe)
 
3
Si
 
8
O
 
16
(OH)
 
12
·5H
 
2
O
9.EE.60Intersilite
Na
 
6
Mn
2+
 
Ti[Si
 
10
O
 
24
(OH)](OH)
 
3
·4H
 
2
O
9.EE.65Shafranovskite
(Na,K)
 
6
(Mn,Fe)
 
3
Si
 
9
O
 
24
·6H
 
2
O
9.EE.65Zakharovite
Na
 
4
Mn
 
5
Si
 
10
O
 
24
(OH)
 
6
·6H
 
2
O
9.EE.70Zeophyllite
Ca
 
4
Si
 
3
O
 
8
(OH,F)
 
4
·2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.1.1Natrosilite
Na
 
2
Si
 
2
O
 
5
14.1.2Ertixiite
Na
 
2
Si
 
4
O
 
9
14.1.3Revdite
Na
 
16
Si
 
16
O
 
27
(OH)
 
26
·28H
 
2
O
14.1.5Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
2
O
14.1.6Kenyaite
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
·6H
 
2
O
14.1.7Grumantite
Na[Si
 
2
O
 
4
(OH)]·H
 
2
O
14.1.8Silinaite
NaLiSi
 
2
O
 
5
·2H
 
2
O

Other Names for Makatite

Synonyms:
IMA1969-003Unnamed (MSH UK-66)
Other Languages:
German:Makatit
Russian:Макатит
Spanish:Makatita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Makatite

Reference List:American Mineralogist (1970): 55: 358-366.

Annehed, H., Faelth, L. & Lincoln, F. J. (1982): Crystal structure of synthetic makatite Na2Si4O8(OH)2.4H2O. Zeitschrift für Kristallographie 159, 203-210.

American Mineralogist (1983): 68: 852.

Articles/Blogs about Makatite

Internet Links for Makatite

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  • Raman and XRD data at RRUFF project
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    Localities for Makatite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Rouville Co.
        • Mont Saint-Hilaire
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
      • Verchères Co.
        • Varennes & St-Amable
          • Saint-Amable sill
    		Mineralogical Record: 29: 83.
    Germany
     
    • Baden-Württemberg
      • Hegau
        • Immendingen
    		Tschernich, R. (1992), Zeolites of the World, p.42
    Kenya
     
    • Rift Valley Province
      • South Rift Valley
    		AM 55 (1970), 358; HB2/2 (1995)
    Namibia
     
    • Khomas Region
      • Windhoek District
        • Windhoek
          • Aris
    		von Knorring, O. and Franke, W. (1987): A preliminary note on the mineralogy and geochemistry of the Aris phonolite, SWA/Namibia. Comm. Geol. Surv. S.W.Africa (Namibia) 3, 61; Petersen, O.V., Fockenberg, T., Toft, P.C. & Rattay, M. (1997): Natrophosphate from the Aris phonolites, Windhoek, Namibia. Neues Jahrbuch für Mineralogie, Monatshefte 1997, 511-517; [http://www.koeln.netsurf.de/~w.steffens/aris.htm]
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
          • Lovozero Massif
    		[World of Stones 95:5-6, p64]
              • Umbozero mine
    		Pavel M. Kartashov data
    Mineral and/or Locality
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