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Macdonaldite

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Formula:
BaCa4Si16O36(OH)2 · 10H2O
System:
Orthorhombic
Colour:
White, colourless.
Lustre:
Vitreous, Silky
Hardness:
3½ - 4
This page provides mineralogical data about Macdonaldite.

Classification of Macdonaldite

Approved
9.EB.05

9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
72.5.1.3

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
14.7.4

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
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First Recorded Occurrence of Macdonaldite

Year of Discovery:
1964

Physical Properties of Macdonaldite

Vitreous, Silky
Colour:
White, colourless.
Hardness (Mohs):
3½ - 4

Crystallography of Macdonaldite

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.06Å, b = 23.52Å, c = 13.08Å
Ratio:
a:b:c = 0.598 : 1 : 0.556
Unit Cell Volume:
V 4,325.44 ų (Calculated from Unit Cell)

Optical Data of Macdonaldite

Type:
Biaxial (+/-)
RI values:
nα = 1.518 nβ = 1.524 nγ = 1.530
2V:
Measured: 90° , Calculated: 88°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak

Chemical Properties of Macdonaldite

Formula:
BaCa4Si16O36(OH)2 · 10H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Mn,Mg,Sr

Relationship of Macdonaldite to other Species

9.EB.05RhodesiteKHCa2Si8O19 · 5H2O
9.EB.10Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O
9.EB.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2O
9.EB.15Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2O
9.EB.20CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2O
14.7.1SanborniteBa2(Si4O10)
14.7.2KrauskopfiteBaSi2O5 · 3H2O
14.7.3WalstromiteBaCa2(Si3O9)
14.7.5EricssoniteBaMn22+Fe3+(Si2O7)O(OH)
14.7.6Ericssonite-2OBaMn22+Fe3+(Si2O7)O(OH)
14.7.7GillespiteBaFe2+[Si4O10]
14.7.8AndrémeyeriteBaFe22+(Si2O7)
14.7.9PellyiteBa2Ca(Fe,Mg)2Si6O17
14.7.10TaikaniteSr3BaMn22+(Si4O12)O2
14.7.11WillemiteZn2SiO4
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2O
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2O
14.7.14HardystoniteCa2Zn(Si2O7)
14.7.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
14.7.16ClinohedriteCaZn(SiO4) · H2O
14.7.17JunitoiteCaZn2Si2O7 · H2O
14.7.18LarsenitePbZnSiO4
14.7.19EsperitePbCa2Zn3(SiO4)3
14.7.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2
14.7.21GerstmanniteMnMgZn(SiO4)(OH)2
14.7.22GageiteMn21(Si4O12)2O3(OH)20
14.7.23FranklinfurnaceiteCa2Fe3+Mn32+Mn3+(Zn2Si2O10)(OH)8

Other Names for Macdonaldite

Name in Other Languages:
Simplified Chinese:莫水硅钙钡石
Spanish:Macdonaldita
Traditional Chinese:莫水矽鈣鋇石

Other Information

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

References for Macdonaldite

Reference List:
American Mineralogist (1965): 50: 314-340.

Internet Links for Macdonaldite

Localities for Macdonaldite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Italy
 
  • Umbria
    • Terni Province
      • San Venanzo
Stoppa, F., Sharygin, V.V., and Cundari, A. (1997): Mineralogy and Petrology 61, 27-45.
USA
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
Alfors, J.T., M.C. Stinson, R.A. Matthews & A. Pabst (1965), Seven new barium minerals from eastern Fresno County, California: American Mineralogist: 50: 318, 322-324; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 464.
Stinson, Melvin Clarence & J.T. Alfors (1964), New minerals from Fresno County – I: California Division Mines & Geology Mineral Information Service.: 17: 238; Nickel & Nichols (1991), Mineral Reference Manual: 124:
[Amer.Min.(1965) 50, 314-340; MinRec 33:161]; Canadian Mineralogist (2001): 39:1053-1058.
Bob Walstrom, p.c.
          • Rush Creek
[Nickel & Nichols, 1991 - "Mineral Reference Manual", p123]
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
[MinRec 30:414]
    • Tulare Co.
      • Dumtah
Mineralogical Record: 34(2): 159-166
Mineral and/or Locality  
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