Struvite-(K)
A valid IMA mineral species
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About Struvite-(K)
Formula:
KMg(PO4) · 6H2O
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
1.864 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Relation to Struvite
Co-Type Localities:
Isostructural with:
Unique Identifiers
Mindat ID:
27534
Long-form identifier:
mindat:1:1:27534:5
GUID
(UUID V4):
(UUID V4):
89486755-4f87-4345-be04-5838d9f5a938
IMA Classification of Struvite-(K)
Classification of Struvite-(K)
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
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
40.1.1.2
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Suv-K | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Struvite-(K)
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness Data:
Could not be measured
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
1.864 g/cm3 (Calculated)
Optical Data of Struvite-(K)
Type:
Biaxial (+)
RI values:
nα = 1.490 nβ = 1.493
Birefringence:
Small
Max Birefringence:
δ = 1.490
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Visible, r < v.
Comments:
The optic normal lying parallel to the needle axis, the mineral shows (±) elongation, depending on the position of the needles.
Chemistry of Struvite-(K)
Mindat Formula:
KMg(PO4) · 6H2O
Crystallography of Struvite-(K)
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 6.903 Å, b = 6.174 Å, c = 11.146 Å
Ratio:
a:b:c = 1.118 : 1 : 1.805
Unit Cell V:
475.03 ų (Calculated from Unit Cell)
Morphology:
Needles, elongated parallel to [100]. Forms include {001}, {010}, {101}, {012}, {110}, {111}, {012}.
Twinning:
Contact twins on (101) common.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0007262 | Struvite-(K) | Graeser S, Postl W, Bojar H P, Berlepsch P, Armbruster T, Raber T, Ettinger K, Walter F (2008) Struvite-(K), KMgPO4*6H2O, the potassium equivalent of struvite - a new mineral European Journal of Mineralogy 20 629-633 | 2008 | Lengenbach, Switzerland | 0 | 293 | |
| 0009654 | Struvite-(K) | Mathew M, Schroeder L W (1979) Crystal structure of a struvite analogue, MgKPO4*6H2O Acta Crystallographica B35 11-13 |  | 1979 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.26 Å | (100) |
| 4.14 Å | (80) |
| 3.27 Å | (90) |
| 2.905 Å | (50) |
| 2.699 Å | (50) |
| 2.650 Å | (70) |
| 1.954 Å | (50) |
Comments:
From type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Struvite-(K)
Co-Type Localities:
General Appearance of Type Material:
Extremely fine needles up to 0.5–0.7 mm in length and 20–30 μm across (Lengenbach). Pseudomorphosed aggregates, intergrown with newberyite, reaching up to several millimetres (Austria).
Place of Conservation of Type Material:
Natural History Museum, Basel, Switzerland, S17.
Geological Setting of Type Material:
With sulphosalts in dolomitic rock (Lengenbach) and with Pb-mineralisation in sericite-schist (Austria).
Associated Minerals at Type Locality:
Synonyms of Struvite-(K)
Other Language Names for Struvite-(K)
Relationship of Struvite-(K) to other Species
Member of:
Other Members of this group:
Related Minerals - Strunz-mindat Grouping
| 8.CH.05 | Walentaite | Fe3+3(P0.84As0.16O4)2(O,OH)6As3+2.56Ca0.42Na0.28Mn2+0.35Fe2+0.30O6.1(OH)0.9(H2O)0.9 |
| 8.CH.05 | Natrowalentaite | [Fe3+0.5Na0.5(H2O)6][NaAs3+2(Fe3+2.33W6+0.67)(PO4)2O7] |
| 8.CH.05 | Halilsarpite | [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] |
| 8.CH.10 | Anapaite | Ca2Fe2+(PO4)2 · 4H2O |
| 8.CH.15 | Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 8.CH.20 | Dittmarite | (NH4)Mg(PO4) · H2O |
| 8.CH.20 | Niahite | (NH4)(Mn2+,Mg)(PO4) · H2O |
| 8.CH.25 | Francoanellite | K3Al5(PO3OH)6(PO4)2 · 12H2O |
| 8.CH.25 | Taranakite | (K,NH4)Al3(PO4)3(OH) · 9H2O |
| 8.CH.30 | Schertelite | (NH4)2MgH2(PO4)2 · 4H2O |
| 8.CH.35 | Hannayite | (NH4)2Mg3H4(PO4)4 · 8H2O |
| 8.CH.40 | Struvite | (NH4)Mg(PO4) · 6H2O |
| 8.CH.40 | Hazenite | KNaMg2(PO4)2 · 14H2O |
| 8.CH.45 | Rimkorolgite | (Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2O |
| 8.CH.50 | Bakhchisaraitsevite | Na2Mg5(PO4)4 · 7H2O |
| 8.CH.55 | Fahleite | CaZn5Fe3+2(AsO4)6 · 14H2O |
| 8.CH.55 | Smolyaninovite | Co3Fe3+2(AsO4)4 · 11H2O |
| 8.CH.60 | Barahonaite-(Al) | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.60 | Barahonaite-(Fe) | (Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.70 | Epifanovite | NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O |
| 8.CH.75 | Esdanaite-(Ce) | NaMnCe(PO4)2 · 4H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Struvite-(K)
mindat.org URL:
https://www.mindat.org/min-27534.html
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References for Struvite-(K)
Reference List:
Localities for Struvite-(K)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria (TL) | |
| Postl et al. (2000) +2 other references |
Switzerland (TL) | |
| Roth (2007) +1 other reference |
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Roßblei Mine, Eschach Alp, Obertalbach valley, Schladming, Liezen District, Styria, Austria