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Loudounite

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Big Photo

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

Show Loudounite Photos (3)



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

    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.
    USA
     
    • Virginia
      • Fairfax Co.
        • Culpeper Basin
          • Centreville
    		Minerals of Virginia, 1990 by R. V. Dietrich; Can.Min.(1983) 21, 37-40
      • Loudoun Co.
        • Leesburg
    		Can.Min.(1983) 21, 37-40; Rocks & Min.:60:167.
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