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Archerite

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Formula:
(K,NH4)(H2PO4)
System:
Tetragonal
Colour:
White
Hardness:
1 - 2
Name:
Named in 1977 for Michael Archer [March 25 1945 Sydney, Australia- ], professor of Biology, University of New South Wales, Australia who drew attention to the deposit.
Isostructural with:
This page provides mineralogical data about Archerite.

Classification of Archerite

Approved
8.AD.15

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
37.1.4.2
37.1.4.2

37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
19.1.7

19 : Phosphates
1 : Phosphates of the alkali metals
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http://www.mindat.org/min-315.html
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First Recorded Occurrence of Archerite

Year of Discovery:
1977
Geological Setting of First Recorded Material:
Guano deposit

Occurrences of Archerite

Geological Setting:
Guano deposits

Physical Properties of Archerite

Sub-Vitreous, Waxy, Greasy
Diaphaneity (Transparency):
Translucent
Colour:
White
Streak:
White
Hardness (Mohs):
1 - 2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.23 g/cm3 (Calculated)
Comment:
Ranges to 2.34

Crystallography of Archerite

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2d
Space Group Setting:
I4 2d
Cell Parameters:
a = 7.451Å, c = 6.974Å
Ratio:
a:c = 1 : 0.936
Unit Cell Volume:
V 387.18 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic crystals with pyramids.
Comment:
Ranges a 7.453, b 6.972
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.09 (10)
3.72 (100)
3.01 (10)
2.91 (80)
2.64 (20)
2.34 (10)
1.982 (10)
1.953 (50)
Comments:
ICDD 35-807, also 20-203

Optical Data of Archerite

Type:
Uniaxial (-)
RI values:
nω = 1.511 - 1.513 nε = 1.468 - 1.470
Birefringence:
0.041
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
parallel

Chemical Properties of Archerite

Formula:
(K,NH4)(H2PO4)
Essential elements:
All elements listed in formula:

Relationship of Archerite to other Species

8.AD.05NahpoiteNa2HPO4
8.AD.10MonetiteCa(HPO4)
8.AD.10WeiliteCa(HAsO4)
8.AD.10ŠvenekiteCa(H2AsO4)2
8.AD.15Biphosphammite(NH4,K)(H2PO4)
8.AD.20Phosphammite(NH4)2(HPO4)
8.AD.25BuchwalditeNaCa(PO4)
8.AD.30SchultenitePb(HAsO4)
8.AD.35Chernovite-(Y)Y(AsO4)
8.AD.35DreyeriteBi(VO4)
8.AD.35Wakefieldite-(Ce)Ce(VO4)
8.AD.35Wakefieldite-(Y)Y(VO4)
8.AD.35Xenotime-(Y)Y(PO4)
8.AD.35PretuliteSc(PO4)
8.AD.35Xenotime-(Yb)(Yb,Y,HREE)(PO4)
8.AD.35Wakefieldite-(La)La(VO4)
8.AD.40PucheriteBi(VO4)
8.AD.45XimengiteBi(PO4)
8.AD.50Gasparite-(Ce)(Ce,REE)(AsO4)
8.AD.50Monazite-(Ce)(Ce,La,Nd,Th)(PO4)
8.AD.50Monazite-(La)(La,Ce,Nd)(PO4)
8.AD.50Monazite-(Nd)(Nd,La,Ce)(PO4)
8.AD.50RooseveltiteBi(AsO4)
8.AD.50Cheralite(Ca,Ce)(Th,Ce)(PO4)2
8.AD.50Monazite-(Sm)(Sm,Gd,Ce,Th)(PO4)
8.AD.50UM2005-35-VO:CaFePSiTh(Th,Ca)(VO4,SiO4,PO4)
8.AD.55TetrarooseveltiteBi(AsO4)
8.AD.60Chursinite(Hg2+)0.5Hg2+(AsO4)
8.AD.65ClinobisvaniteBi(VO4)
19.1.1LithiophosphateLi3PO4
19.1.2OlympiteNa5Li(PO4)2
19.1.3NahpoiteNa2HPO4
19.1.4DorfmaniteNa2HPO4 · 2H2O
19.1.5NalipoiteNaLi2PO4
19.1.6StercoriteNa(NH4)HPO4 · 4H2O
19.1.8Biphosphammite(NH4,K)(H2PO4)
19.1.9Phosphammite(NH4)2(HPO4)
19.1.10LithiophiliteLiMn2+PO4
19.1.11SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
19.1.12FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
19.1.13TriphyliteLiFe2+PO4
19.1.14TavoriteLiFe3+(PO4)(OH)
19.1.15MarićiteNaFe2+(PO4)

Other Names for Archerite

Name in Other Languages:
German:Archerit
Spanish:Archerita

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.

References for Archerite

Reference List:
Bridge, P.J. (1977) Archerite, (K,NH4)H2PO4, a new mineral from Madura, Western Australia. Mineralogical Magazine, 41, 33-35.

Fleischer, M., Pabst, A., Mandarino, J.A., Chao, G.Y. (1977) New Mineral Names. American Mineralogist, 62, 1057-1061.

Zeitschrift für Kristallographie: 74: 306-332.

Internet Links for Archerite

Localities for Archerite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Australia
 
  • Western Australia
    • Dundas Shire
      • Cocklebiddy Roadhouse
R Bottrill collection
Min. Mag. 39,467-469(1973)
      • Madura Roadhouse
Mineralogical Magazine (1977): 41: 33-35.
Namibia
 
  • Khomas Region
    • Windhoek District
[AmMin 84:193]
Saudi Arabia
 
  • Mintaqah Makkah
Saudi Geological Survey Open-File Report SGS-OF-2004-12, 68 p.
Mineral and/or Locality  
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