Sal-ammoniac Mineral Data

Sal-ammoniac Mineral Data

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General Sal-ammoniac Information

Chemical Formula:

NH4Cl

Composition:

Molecular Weight = 53.49 gm

Hydrogen 7.54 % H - % Calc as (NH₄)₂O

Nitrogen 26.19 % N 48.68 % (NH₄)₂O

Chlorine 66.28 % Cl 66.28 % Cl

- % Cl -14.96 % -O=Cl₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)Cl

Environment:

Volcanic fumaroles, burning coal seams and quano deposits.

IMA Status:

Valid Species (Pre-IMA) 1546

Locality:

Etna, Vesuvius, Italy Link to MinDat.org Location Data.

Name Origin:

Alchemist's Latin name for "salt of Ammon", used by early writers for common rock salt from near the Oracle of Ammon in Egypt.

Synonym:

ICSD 23983

PDF 34-710

Sal Ammoniac

Salmiac

Sal-ammoniac Image

Images:

Sal-ammoniac

Comments: Network of white or slightly grayish sal-ammoniac crystals with some sulfur.
Location: Ravat, Tien Shan Mtns, Central Tajikistan. Scale: 6 x 4 x 3 cm.
© John Attard

Images:

Sal-ammoniac Erythrosiderite

Comments: Orange-brown aggregates of erythrosiderite with sal ammoniac. Material from the 1926 eruption of the Erythrosiderite is hygroscopic and must be stored in a closed vial. The photo was made through the vial.
Location: Vesuvius, Naples Province, Campania, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Sal-ammoniac Crystallography

Cell Dimensions:

a = 3.8758, Z = 1; V = 58.22 Den(Calc)= 1.53

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3m

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

By Intensity(I/I_o): 2.74(1), 1.582(0.25), 3.87(0.25),

Forms:

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Forms: [ 1 2 3] [ 0 1 1] [ 1 1 2]

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Crystal Structure:

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Sirdeshmukh D B , Deshpande V T , Acta Crystallographica, Section A , 26 (1970) p.295-295, X-ray measurement of the thermal expansion of ammonium chloride, Locality: synthetic, Sample: T = 31.5 C

View Additional jPOWD Structure files for Sal-ammoniac
[1] [2]

Physical Properties of Sal-ammoniac

Cleavage:

[???] Poor, [???] Poor, [???] Poor

Color:

Colorless, White, Grayish, Yellow, Brown.

Density:

1.5

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sal-ammoniac

Gladstone-Dale:

CI meas= -1.206 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.163 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.4529,KPDmeas= 0.462,KC= 0.2094

Optical Data:

Isotropic, n=1.693.

Calculated Properties of Sal-ammoniac

Electron Density:

r_electron=1.60 gm/cc
note: r_Sal-ammoniac=1.53 gm/cc.

Fermion Index

Fermion Index = 0.26089
Boson Index = 0.73911

Photoelectric:

PE_Sal-ammoniac= 4.15 barns/electron
U=PE_Sal-ammoniac x r_electron= 6.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sal-ammoniac is Not Radioactive

Sal-ammoniac Classification

Dana Class:

9.1.3.1 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.3)Dana Group

9.1.3.1 Sal-ammoniac NH4Cl P m3m 4/m 3 2/m

9.1.3.2 IMA2003-032! Tl(Cl,Br) P m3m 4/m 3 2/m

Strunz Class:

III/A.04-10 III - Halogenides

III/A - Simple halogenides, without water Metal : Halogen = 1 : 1

III/A.04 - Salmiac

III/A.04-10 Sal-ammoniac NH4Cl P m3m 4/m 3 2/m

Other Sal-ammoniac Information

References:

NAME( Dana8) PHYS. PROP.(Dana's Sys. of Min.,7th ed.,Vol.2,1951) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Sal-ammoniac :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Sal-ammoniac Specimen Label here :

Sal-ammoniac

NH4Cl
Dana No: 9.1.3.1 Strunz No: III/A.04-10
Locality:

Notes: