Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Macdonaldite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Big Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA
© JBS 2006

Show Macdonaldite Photos (6)



Formula:
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
 · 10H
 
2
O
System:OrthorhombicColour:White, colourless.
Lustre:Vitreous, SilkyHardness:3½ - 4
This page provides mineralogical data about Macdonaldite.

Classification of Macdonaldite

IMA status:Approved
Strunz 8th edition ID:8/H.38-50
Nickel-Strunz 10th (pending) edition ID:9.EB.05

9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
Dana 8th edition ID: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
Hey's CIM Ref.:14.7.4

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
mindat.org URL:http://www.mindat.org/min-2506.html
Please feel free to link to this page.

Type Occurrence of Macdonaldite

Co-type Localities:Big Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA
Esquire No. 7 claim, Big Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA
Esquire No. 1 claim, Rush Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA
Year of Discovery:1964

Physical Properties of Macdonaldite

Lustre: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°
Maximum Birefringence:δ = 0.012

Chart 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:
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
 · 10H
 
2
O
Essential elements:Ba, Ca, H, O, Si
All elements listed in formula:Ba, Ca, H, O, Si
Common Impurities:Ti,Al,Fe,Mn,Mg,Sr

Relationship of Macdonaldite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EB.05Rhodesite
KHCa
 
2
Si
 
8
O
 
19
 · 5H
 
2
O
9.EB.10Delhayelite
(Na,K)
 
10
Ca
 
5
Al
 
6
Si
 
32
O
 
80
(Cl
 
2
,F
 
2
,SO
 
4
)
 
3
 · 18H
 
2
O
9.EB.10Hydrodelhayelite
KCa
 
2
AlSi
 
7
O
 
17
(OH)
 
2
 · 6H
 
2
O
9.EB.15Monteregianite-(Y)
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
 · 10H
 
2
O
9.EB.20Carletonite
KNa
 
4
Ca
 
4
Si
 
8
O
 
18
(CO
 
3
)
 
4
(OH,F) · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.7.1Sanbornite
Ba
 
2
(Si
 
4
O
 
10
)
14.7.2Krauskopfite
BaSi
 
2
O
 
5
 · 3H
 
2
O
14.7.3Walstromite
BaCa
 
2
(Si
 
3
O
 
9
)
14.7.5Ericssonite
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
14.7.6Ericssonite-2O
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
14.7.7Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
14.7.8Andrémeyerite
Fe
2+
2
Ba(Si
 
2
O
 
7
)
14.7.9Pellyite
Ba
 
2
Ca(Fe,Mg)
 
2
Si
 
6
O
 
17
14.7.10Taikanite
Sr
 
3
BaMn
2+
2
(Si
 
4
O
 
12
)O
 
2
14.7.11Willemite
Zn
 
2
SiO
 
4
14.7.12Hemimorphite
Zn
 
4
Si
 
2
O
 
7
(OH)
 
2
 · H
 
2
O
14.7.13Zincsilite
Zn
 
3
(Si
 
4
O
 
10
)(OH)
 
2
 · 4H
 
2
O
14.7.14Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
14.7.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)Si
 
2
O
 
6
14.7.16Clinohedrite
CaZn(SiO
 
4
) · H
 
2
O
14.7.17Junitoite
CaZn
 
2
Si
 
2
O
 
7
 · H
 
2
O
14.7.18Larsenite
PbZnSiO
 
4
14.7.19Esperite
PbCa
 
2
Zn
 
3
(SiO
 
4
)
 
3
14.7.20Hodgkinsonite
Mn
2+
 
Zn
 
2
(SiO
 
4
)(OH)
 
2
14.7.21Gerstmannite
(Mg,Mn
2+
 
)Zn(SiO
 
4
)(OH)
 
2
14.7.22Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
14.7.23Franklinfurnaceite
Ca
 
2
Fe
3+
 
Mn
2+
3
Mn
3+
 
(Zn
 
2
Si
 
2
O
 
10
)(OH)
 
8

Other Names for Macdonaldite

Synonyms:
IMA1964-010
Other Languages:
German:Macdonaldit
Russian:Макдональдит
Spanish:Macdonaldita

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 Macdonaldite

Reference List:

- +
American Mineralogist (1965): 50: 314-340.

Internet Links for Macdonaldite

Search Engines:
  • Look for Macdonaldite on Google
  • Look for Macdonaldite images on Google
    • External Links:
  • Look for Macdonaldite on Webmineral
  • Look for Macdonaldite on Athena Mineralogy
  • Look for Macdonaldite on Wikipedia
  • Look for Macdonaldite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Macdonaldite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Search for minerals at Heliodor
  • Search for - Macdonaldite - on e-Rocks Mineral Sales & Auctions
  • High-end worldwide specimens & outstanding customer service
  • Top quality minerals from Kristalle of California
  • Edwards Minerals - Fine Specimens
  • SpiriferMinerals.com - high quality low prices
  • Wilensky Fine Minerals
  • Pricedownminerals.com - Reverse Auctions and Shop
  • Buy fine minerals and gemstones from Pala International
  • Fabre Minerals - search for Macdonaldite specimens
  • The Arkenstone - Fine Minerals
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Macdonaldite

    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.
    Hide Locality List
    (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.
    Italy
     
    • Umbria
      • Terni Province
        • Marsciano
          • 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.
        • Incline
          • Trumbull Peak
    		[MinRec 30:414]
      • Tulare Co.
        • Exeter area
          • Chickencoop Canyon
    		Mineralogical Record: 34(2): 159-166
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 17:33:03
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds