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Struvite-(K)

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Formula:
KMg(PO
 
4
)·6H
 
2
O
System:OrthorhombicColour:Colourless
Member of:Struvite Group
Name:Relation to Struvite
Isostructural with:Struvite


Struvite Group.
The potassium analogue of Struvite.

Classification of Struvite-(K)

IMA status:Approved 2003
Nickel-Strunz 10th (pending) edition ID:8.CH.40

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
Dana 8th edition ID:40.1.1.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O
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Type Occurrence of Struvite-(K)

Co-type Localities:Rossblei Mine, Eschach Alp (Eschachboden), Obertalbach valley, Schladminger Tauern Mts, Schladming, Styria, Austria
Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland

Physical Properties of Struvite-(K)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless

Crystallography of Struvite-(K)

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Pmn21
Cell Parameters:a = 6.903Å, b = 6.174Å, c = 11.146Å
Ratio:a:b:c = 1.118 : 1 : 1.805
Unit Cell Volume:V 475.03 ų (Calculated from Unit Cell)
Morphology:Needles, elongated parallel to [100]
X-Ray Powder Diffraction:
d-spacingIntensity
4.26(100)
4.14(80)
3.27(90)
2.905(50)
2.699(50)
2.650(70)
1.954(50)
Comments:From type description.

Optical Data of Struvite-(K)

Type:Biaxial (+)
RI values: nα = 1.490 nβ = 1.493
Maximum Birefringence:δ = 1.490

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

Chemical Properties of Struvite-(K)

Formula:
KMg(PO
 
4
)·6H
 
2
O
Essential elements:H, K, Mg, O, P
All elements listed in formula:H, K, Mg, O, P

Relationship of Struvite-(K) to other Species

Member of:Struvite Group
Other Members of Group:

- +
Hazenite
KNaMg
 
2
(PO
 
4
)
 
2
 · 14H
 
2
O
Struvite
(NH
 
4
)Mg(PO
 
4
) · 6H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CH.05Walentaite
H(Ca,Mn
2+
 
,Fe
2+
 
)Fe
3+
3
(AsO
 
4
,PO
 
4
)
 
4
 · 7H
 
2
O
8.CH.10Anapaite
Ca
 
2
Fe
2+
 
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CH.15Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 11H
 
2
O
8.CH.20Dittmarite
(NH
 
4
)Mg(PO
 
4
) · H
 
2
O
8.CH.20Niahite
(NH
 
4
)(Mn
2+
 
,Mg)(PO
 
4
) · H
 
2
O
8.CH.25Francoanellite
K
 
3
Al
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
3
 · 12H
 
2
O
8.CH.25Taranakite
(K,NH
 
4
)Al
 
3
(PO
 
4
)
 
3
(OH) · 9H
 
2
O
8.CH.30Schertelite
(NH
 
4
)
 
2
MgH
 
2
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CH.35Hannayite
(NH
 
4
)
 
2
Mg
 
3
H
 
4
(PO
 
4
)
 
4
 · 8H
 
2
O
8.CH.40Struvite
(NH
 
4
)Mg(PO
 
4
) · 6H
 
2
O
8.CH.40Hazenite
KNaMg
 
2
(PO
 
4
)
 
2
 · 14H
 
2
O
8.CH.45Rimkorolgite
(Mg,Mn)
 
5
(Ba,Sr,Ca)(PO
 
4
)
 
4
 · 8H
 
2
O
8.CH.50Bakhchisaraitsevite
Na
 
2
Mg
 
5
(PO
 
4
)
 
4
 · 7H
 
2
O
8.CH.55Fahleite
Zn
 
5
CaFe
 
2
(AsO
 
4
)
 
6
 · 14H
 
2
O
8.CH.55Smolyaninovite
8.CH.55Smolianinovite
(Co,Ni,Mg,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(AsO
 
4
)
 
4
 · 11H
 
2
O
8.CH.60Barahonaite-(Al)
(Ca,Cu,Na,Fe
3+
 
,Al)
 
12
Al
 
2
(AsO
 
4
)
 
8
(OH,Cl)
 
x
 · nH
 
2
O
8.CH.60Barahonaite-(Fe)
(Ca,Cu,Na,Fe
3+
 
,Al)
 
12
Fe
3+
2
(AsO
 
4
)
 
8
(OH,Cl)
 
x
 · nH
 
2
O

Other Names for Struvite-(K)

Synonyms:
IMA2003-048Unnamed (K-Mg-H Phosphate)
Other Languages:
German:Struvit-K
Russian:Струвит-K

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 Struvite-(K)

Reference List:

- +
S. Graeser, W. Postl, H. Bojar, P. Berlepsch, T. Armbruster, T. Raber, K. Ettinger & F. Walter (2008): Struvite-(K), KMgPO4.6H2O, the potassium equivalent of struvite - a new mineral. European Journal of Mineralogy 20, 629-633.

Internet Links for Struvite-(K)

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    • Localities for Struvite-(K)

    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.
    Austria
     
    • Styria
      • Schladming
        • Schladminger Tauern Mts
          • Obertalbach valley
            • Eschach Alp (Eschachboden)
    		Postl, W., Walter, F., Ettinger K.. &. Bojar, H.-P. (2000): Erster Nachweis des Kalium-Analogons MgK(PO4).6H2O von Struvit, und der kristallinen Phase Mg2KH(PO4)2.15H2O aus dem ehemaligen Bleibergbau Rossblei, Eschachalm, Schladminger Tauern, Steiermark, Österreich. Joannea Min., 1, 45-52; Roth, Ph. (2007): Minerals first discovered in Switzerland and minerals named after Swiss individuals. Philippe Roth, Ed., Zurich, 239 pp.; S. Graeser, W. Postl, H. Bojar, P. Berlepsch, T. Armbruster, T. Raber, K. Ettinger & F. Walter (2008): Struvite-(K), KMgPO4.6H2O, the potassium equivalent of struvite - a new mineral. European Journal of Mineralogy 20, 629-633.
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Im Feld (Imfeld; Feld; Fäld)
    		Roth, Ph. (2007): Minerals first discovered in Switzerland and minerals named after Swiss individuals. Philippe Roth, Ed., Zurich, 239 pp; S. Graeser, W. Postl, H. Bojar, P. Berlepsch, T. Armbruster, T. Raber, K. Ettinger & F. Walter (2008): Struvite-(K), KMgPO4.6H2O, the potassium equivalent of struvite - a new mineral. European Journal of Mineralogy 20, 629-633.
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