|
![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
Archerite Mineral Data
|
|
|
General Archerite Information
|
Chemical Formula: |
(K,NH4)H2PO4 |
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 |
Empirical Formula: |
K0.75(NH4)0.25H2(PO4) |
Environment: |
Occurs as a component of stalactites and crusts on the walls of caves containing bat guano deposits. |
IMA Status: |
Approved IMA 1975 |
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. |
Name Origin: |
Honors Dr. Michael Archer (1945- ), Curator of Mammals, Queensland Museum, Brisbane, Australia, who discovered the first specimens. |
Name Pronunciation: |
Archerite + Pronunciation |
Synonym: |
ICSD 71311 |
|
PDF 35-807 |
|
Archerite Image |
Images:
|
|
Archerite Crystallography
|
Axial Ratios: |
a:c = 1:0.93676 |
Cell Dimensions: |
a = 7.448, c = 6.977, Z = 4; V = 387.03 Den(Calc)= 2.24 |
Crystal System: |
Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42d |
X Ray Diffraction: |
By Intensity(I/Io): 3.72(1), 2.91(0.8), 1.95(0.5), |
|
Physical Properties of Archerite
|
Cleavage: |
None |
Color: |
Beige, White. |
Hardness: |
2 - Gypsum |
Streak: |
white |
|
Optical Properties of Archerite
|
Gladstone-Dale: |
CI calc= -0.102 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2194,KC= 0.199 Ncalc = 1.45 |
Optical Data: |
Uniaxial (-), e=1.47, w=1.513, bire=0.0430. |
|
Calculated Properties of Archerite
|
Electron Density: |
Bulk Density (Electron Density)=2.26 gm/cc note: Specific Gravity of Archerite =2.24 gm/cc. |
Fermion Index: |
Fermion Index = 0.02 Boson Index = 0.98 |
Photoelectric: |
PEArcherite = 3.36 barns/electron U=PEArcherite x relectron= 7.60 barns/cc. |
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
|
Dana Class: |
37.01.04.02 (37)Anhydrous Acid Phosphates, etc |
|
(37.01)with miscellaneous formulae |
|
(37.01.04)Dana Group |
|
37.01.04.01 Biphosphammite (NH4,K)H2PO4 I 42d 4 2m |
|
37.01.04.02 Archerite (K,NH4)H2PO4 I 42d 4 2m |
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
|
References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
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
Search for Archerite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Archerite :
Ask about Archerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
Print or Cut-and-Paste your Archerite Specimen Label here :
Archerite
(K,NH4)H2PO4
Dana No: 37.01.04.02 Strunz No: 08.AD.15
Locality:
Notes:
|
|
|
|
|
|
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.