Teschemacherite Mineral Data

General Teschemacherite Information

Chemical Formula:

(NH4)HCO3

Composition:

Molecular Weight = 79.06 gm

Hydrogen 5.10 % H - % Calc as (NH₄)₂O

Hydrogen 1.27 % H 11.39 % H₂O

Carbon 15.19 % C 55.67 % CO₂

Nitrogen 17.72 % N 32.94 % (NH₄)₂O

Oxygen 60.71 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)(HCO₃)

Environment:

Guano deposits.

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Undefined locality in Patagonia [probably in Argentina]. Link to MinDat.org Location Data.

Name Origin:

Named for Frederick Edward Teschemacher (1791-1863), English chemist, who first described the species.

Name Pronunciation:

Teschemacherite + Pronunciation

Synonym:

ICSD 100877

PDF 9-415

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Teschemacherite Crystallography

Axial Ratios:

a:b:c =0.6774:1:0.8166

Cell Dimensions:

a = 7.255, b = 10.709, c = 8.746, Z = 8; V = 679.51 Den(Calc)= 1.55

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pccn

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

By Intensity(I/I_o): 3(1), 5.34(0.6), 3.62(0.55),

Crystal Structure:

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Pertlik F , Tschermaks Mineralogische und Petrographische Mitteilungen , 29 (1981) p.67-74, Verfeinerung der kristallstruktur des teschemacherits, (NH4)CO2(OH)

Physical Properties of Teschemacherite

Cleavage:

{110} Perfect

Color:

Colorless, Yellowish, White, Light yellow.

Density:

1.58

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Teschemacherite

Gladstone-Dale:

CI meas= -1.043 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3254,KPDmeas= 0.3192,KC= 0.1562
Ncalc = 1.24 - 1.25

Optical Data:

Biaxial (-), a=1.4227, b=1.5358, g=1.5545, bire=0.1318, 2V(Calc)=40, 2V(Meas)=41.633.

Calculated Properties of Teschemacherite

Electron Density:

Bulk Density (Electron Density)=1.68 gm/cc
note: Specific Gravity of Teschemacherite =1.58 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_{Teschemacherite}= 0.32 barns/electron
U=PE_{Teschemacherite} x rElectron Density= 0.54 barns/cc.

Radioactivity:

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

Teschemacherite Classification

Dana Class:

13.01.03.01 (13)Acid Carbonates

(13.01)with miscellaneous formulae

(13.01.03)Dana Group

13.01.03.01 Teschemacherite (NH4)HCO3 Pccn 2/m 2/m 2/m

Strunz Class:

05.AA.25 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AA -Alkali Carbonates

05.AA.25 Teschemacherite (NH4)HCO3 Pccn 2/m 2/m 2/m

Other Teschemacherite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Teschemacherite :
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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Teschemacherite Specimen Label here :

Teschemacherite

(NH4)HCO3
Dana No: 13.01.03.01 Strunz No: 05.AA.25
Locality:

Notes: