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Lourenswalsite

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Diamond Jo Quarry, Magnet Cove, Hot Spring Co., Arkansas, USA
© Thomas Witzke

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Formula:
(K,Ba)
 
2
(Ti,Mg,Ca,Fe)
 
4
(Si,Al,Fe)
 
6
O
 
14
(OH)
 
12
System:Hexagonal
Name:
Named after Dr. Lourens Wals, mineral collector of Turnhout, Belgium.
This page provides mineralogical data about Lourenswalsite.

Classification of Lourenswalsite

IMA status:Approved
Strunz 8th edition ID:8/H.38-80
Nickel-Strunz 10th (pending) edition ID:9.EJ.05

9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates
Dana 8th edition ID:61.2.3.1

61 : CYCLOSILICATES Six-Membered Rings
2 : Six-Membered Rings with Al substituted rings
Hey's CIM Ref.:16.14.7

16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb
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Type Occurrence of Lourenswalsite

Type Locality:Diamond Jo Quarry, Magnet Cove, Hot Spring Co., Arkansas, USA
Year of Discovery:1987

Crystallography of Lourenswalsite

Crystal System:Hexagonal
Cell Parameters:a = 5.24Å, c = 20.49Å
Ratio:a:c = 1 : 3.91
Unit Cell Volume:V 487.23 ų (Calculated from Unit Cell)

Optical Data of Lourenswalsite

Type:Biaxial (-)
RI values: nα = 1.815 nβ = 1.840 nγ = 1.840
Maximum Birefringence:δ = 0.025

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

Chemical Properties of Lourenswalsite

Formula:
(K,Ba)
 
2
(Ti,Mg,Ca,Fe)
 
4
(Si,Al,Fe)
 
6
O
 
14
(OH)
 
12
Essential elements:H, K, O, Si, Ti
All elements listed in formula:Al, Ba, Ca, Fe, H, K, Mg, O, Si, Ti
Common Impurities:Al,H2O

Relationship of Lourenswalsite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EJ.10Middendorfite
K
 
3
Na
 
2
Mn
 
5
Si
 
12
(O,OH)
 
36
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.14.1Zorite
Na
 
8
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
 · 14H
 
2
O
16.14.2Vinogradovite
(Na,Ca,K)
 
4
Ti
 
4
AlSi
 
6
O
 
23
(OH) · 2H
 
2
O
16.14.3Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
16.14.4Kaersutite
{Na}{Ca
 
2
}{Mg
 
4
Ti}(Al
 
2
Si
 
6
O
 
22
)(OH)O
16.14.5Ferrokaersutite
{Na}{Ca
 
2
}{Fe
2+
4
Ti}(Al
 
2
Si
 
6
O
 
22
)(OH)O
16.14.6Jonesite
Ba
 
4
(K,Na)
 
2
Ti
 
4
Al
 
2
(Si
 
3
O
 
9
)
 
2
(SiO
 
4
)
 
4
O
 
2
 · 6H
 
2
O
16.14.8Labuntsovite-Mn
Na
 
4
K
 
4
(Ba,K)
 
2
Mn
2+
 
(Ti,Nb)
 
8
(Si
 
4
O
 
12
)
 
4
(O,OH)
 
8
 · 10-12H
 
2
O
16.14.9Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
((Si,Al,Fe
3+
 
)O
 
4
)
 
3
16.14.10Ellenbergerite
Mg
 
6
(Mg,Ti,Zr,◻)
 
2
(Al,Mg)
 
6
Si
 
8
O
 
28
(OH)
 
10
16.14.11Carlosturanite
(Mg,Fe,Ti)
 
21
(Si,Al)
 
12
O
 
28
(OH)
 
34
16.14.12Eakerite
Ca
 
2
SnAl
 
2
Si
 
6
O
 
18
(OH)
 
2
 · 2H
 
2
O
16.14.13Plumalsite
Pb
 
4
Al
 
2
(SiO
 
3
)
 
7
16.14.14Wickenburgite
CaPb
 
3
Al
 
2
Si
 
10
O
 
24
(OH)
 
6
16.14.15Maricopaite
Pb
 
7
Ca
 
2
(Si,Al)
 
48
O
 
100
 · 32H
 
2
O
16.14.16Epidote-(Pb)
{CaPb}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.14.17Burckhardtite
Pb
 
2
(Fe
3+
 
,Mn
3+
 
)Te
4+
 
(AlSi
 
3
O
 
10
)O
 
2
(OH)
 
2
 · H
 
2
O
16.14.18Mathewrogersite
Pb
 
7
FeAl
 
3
GeSi
 
12
O
 
36
(OH,H
 
2
O)
 
6

Other Names for Lourenswalsite

Synonyms:
IMA1987-005
Other Languages:
German:Lourenswalsit
Spanish:Lourenswalsita

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 Lourenswalsite

Reference List:

- +
Appleman, D.E., Evan, H.T., Jr., Nord, G.L., Dwornik, E.J. and Milton, Charles (1987): DeLindeite and lourenswalsite, two new titanosilicates from the Magnet Cove region, Arkansas. Mineralogical Magazine: 51: 417-425.

American Mineralogist (1988): 73: 1493-1494.

Internet Links for Lourenswalsite

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    • Localities for Lourenswalsite

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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
     
    • Arkansas
      • Hot Spring Co.
        • Magnet Cove
    		Rocks & Min.:63:109.
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