Oxammite Mineral Data

General Oxammite Information

Chemical Formula:

(NH4)2(C2O4)•(H2O)

Composition:

Molecular Weight = 142.11 gm

Hydrogen 5.67 % H - % Calc as (NH₄)₂O

Hydrogen 1.42 % H 12.68 % H₂O

Carbon 16.90 % C 50.68 % C₂O₃

Nitrogen 19.71 % N 36.64 % (NH₄)₂O

Oxygen 56.29 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₂(C₂O₄)•(H₂O)

Environment:

Derived from bird or bat guano; in subfossil bird eggs and on subfossil birds.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Guanape Islands, south of Trujillo, Peru. Link to MinDat.org Location Data.

Name Origin:

Named as an OXalate of AMMonia.

Name Pronunciation:

Oxammite

Synonym:

ICSD 64936

PDF 14-801

Oxammite Image

Images:

Oxammite

Comments: Pale yellow translucent crystalline granular oxammite.
Location: Petrogale Cave, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Oxammite Crystallography

Axial Ratios:

a:b:c =0.7793:1:0.3686

Cell Dimensions:

a = 8.035, b = 10.31, c = 3.801, Z = 2; V = 314.88 Den(Calc)= 1.50

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.666(1), 3.057(0.95), 6.32(0.95),

Crystal Structure:

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Taylor J C , Sabine T M , Acta Crystallographica, Section B , 28 (1972) p.3340-3351, Isotope and bonding effects in ammonium oxalate monohydrate, determined by the, combined use of neutron and X-ray diffraction analyses, Locality: synthetic, Sample: DOX(N)

Physical Properties of Oxammite

Cleavage:

{001} Distinct

Color:

Colorless, Yellowish white.

Density:

1.5

Diaphaneity:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Oxammite

Gladstone-Dale:

CI meas= -7.146 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -7.146 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3511,KPDmeas= 0.3511,KC= 0.0431
Ncalc = 1.06

Optical Data:

Biaxial (-), a=1.438, b=1.547, g=1.595, bire=0.1570, 2V(Calc)=62, 2V(Meas)=62.

Calculated Properties of Oxammite

Electron Density:

Bulk Density (Electron Density)=1.60 gm/cc
note: Specific Gravity of Oxammite =1.50 gm/cc.

Fermion Index:

Fermion Index = 0.19
Boson Index = 0.81

Photoelectric:

PE_Oxammite= 0.31 barns/electron
U=PE_Oxammite x rElectron Density= 0.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Oxammite is Not Radioactive

Oxammite Classification

Dana Class:

50.01.05.01 (50)Salts of Organic Acids

(50.01)(Oxalates)

(50.01.05)Dana Group

50.01.05.01 Oxammite (NH4)2(C2O4)•(H2O) P 2₁2₁2 2 2 2

Strunz Class:

10.AB.55 10 - ORGANIC COMPOUNDS

10.A - Salts of Organic Acids

10.AB -Oxalates

10.AB.55 Oxammite (NH4)2(C2O4)•(H2O) P 2₁2₁2 2 2 2

Other Oxammite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Oxammite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Oxammite here :
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Print or Cut-and-Paste your Oxammite Specimen Label here :

Oxammite

(NH4)2(C2O4)•(H2O)
Dana No: 50.01.05.01 Strunz No: 10.AB.55
Locality:

Notes: