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Loudounite

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New Goose Creek Quarry (Luck Company Quarry), Leesburg, Loudoun Co., Virginia, USA
© JBS 2006

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Formula:
NaCa
 
5
Zr
 
4
Si
 
16
O
 
40
(OH)
 
11
·8H
 
2
O
This page provides mineralogical data about Loudounite.

Classification of Loudounite

IMA status:Approved
Strunz 8th edition ID:8/G.09-20
Nickel-Strunz 10th (pending) edition ID:9.HF.10

9 : SILICATES (Germanates)
H : Unclassified silicates
F : With Nb, Ta, Zr
Dana 8th edition ID:59.2.2.5

59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
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Type Occurrence of Loudounite

Type Locality:New Goose Creek Quarry (Luck Company Quarry), Leesburg, Loudoun Co., Virginia, USA
Year of Discovery:1983

Optical Data of Loudounite

Type:Biaxial
RI values: nα = 1.536 nγ = 1.550
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v weak

Chemical Properties of Loudounite

Formula:
NaCa
 
5
Zr
 
4
Si
 
16
O
 
40
(OH)
 
11
·8H
 
2
O
Essential elements:Ca, H, Na, O, Si, Zr
All elements listed in formula:Ca, H, Na, O, Si, Zr
Common Impurities:Fe,Al,Mn,Mg,K

Relationship of Loudounite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HF.05Mongolite
Ca
 
4
Nb
 
6
Si
 
5
O
 
24
(OH)
 
10
·nH
 
2
O

Other Names for Loudounite

Synonyms:
IMA1982-013
Other Languages:
German:Loudounit
Spanish:Loudounita

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 Loudounite

Reference List:American Mineralogist (1983): 68: 1039.

Canadian Mineralogist (1983): 21: 37-40.

Internet Links for Loudounite

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    Localities for Loudounite

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    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.
    (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.
    USA
     
    • Virginia
      • Fairfax Co.
        • Culpeper Basin
          • Centreville
    		Minerals of Virginia, 1990 by R. V. Dietrich
      • Loudoun Co.
        • Leesburg
    		Can.Min.(1983) 21, 37-40; Rocks & Min.:60:167.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. 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. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 12th Nov 2009 04:46:26