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Archerite Mineral Data

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General Archerite Information

Help on Chemical  Formula: Chemical Formula: (K,NH4)H2PO4
Help on Composition: Composition: Molecular Weight = 130.82 gm
   Potassium   22.42 %  K    27.00 % K2O
   Phosphorus  23.68 %  P    54.25 % P2O5
   Hydrogen     0.77 %  H      -   % Calc as (NH4)2O
   Hydrogen     1.54 %  H    13.77 % H2O
   Nitrogen     2.68 %  N     4.98 % (NH4)2O
   Oxygen      48.92 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.75(NH4)0.25H2(PO4)
Help on Environment: Environment: Occurs as a component of stalactites and crusts on the walls of caves containing bat guano deposits.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: In Petrogale Cave, near Madura, and in Murra-el-elevyn Cave, about 200 km east of Balladonia, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Honors Dr. Michael Archer (1945- ), Curator of Mammals, Queensland Museum, Brisbane, Australia, who discovered the first specimens.
Help on Name Pronunciation: Name Pronunciation: Archerite + Pronunciation Say ARCHERITE
Help on Synonym: Synonym: ICSD 71311
  PDF 35-807

Archerite Image

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  Archerite   Biphosphammite

Comments: Buff-colored biphosphammite with white archerite crusts.
Location: Cockelbiddy Cave, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Archerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.93676
Help on Cell Dimensions: Cell Dimensions: a = 7.448, c = 6.977, Z = 4; V = 387.03 Den(Calc)= 2.24
Help on Crystal System: Crystal System: Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.72(1), 2.91(0.8), 1.95(0.5),

Physical Properties of Archerite

Help on Cleavage: Cleavage: None
Help on Color: Color: Beige, White.
Help on Hardness: Hardness: 2 - Gypsum
Help on Streak: Streak: white

Optical Properties of Archerite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.102 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KC= 0.199
Ncalc = 1.45
Help on Optical Data: Optical Data: Uniaxial (-), e=1.47, w=1.513, bire=0.0430.

Calculated Properties of Archerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Archerite =2.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEArcherite = 3.36 barns/electron
U=PEArcherite x relectron= 7.60 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 326.34 (Gamma Ray American Petroleum Institute Units)
Concentration of Archerite per GRapi unit = 0.31 (%)

Estimated Radioactivity from Archerite - barely detectable


Archerite Classification

Help on  Dana Class: Dana Class: (37)Anhydrous Acid Phosphates, etc
  (37.01)with miscellaneous formulae
  (37.01.04)Dana Group Biphosphammite (NH4,K)H2PO4 I 42d 4 2m Archerite (K,NH4)H2PO4 I 42d 4 2m
Help on  Strunz Class: Strunz Class: 08.AD.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.15 Archerite (K,NH4)H2PO4 I 42d 4 2m
08.AD.15 Biphosphammite (NH4,K)H2PO4 I 42d 4 2m

Other Archerite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Archerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 08.AD.15





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