Mineralogy Database

Niter Mineral Data

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General Niter Information

Help on Chemical  Formula: Chemical Formula: KNO3
Help on Composition: Composition: Molecular Weight = 101.10 gm
   Potassium  38.67 %  K    46.58 % K2O
   Nitrogen   13.85 %  N    53.42 % N2O5
   Oxygen     47.47 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K(NO3)
Help on Environment: Environment: Efflorescence on cavern walls.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) Prehistoric
Help on Locality: Locality: Limestone caves in Kentucky and Tennessee. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named derived from Herbraic neter, used in ancient times for alkaline salts extracted by water from vegetable ashes.
Help on Name Pronunciation: Name Pronunciation: Niter Say NITER
Help on Synonym: Synonym: ICSD 10289
  PDF 5-377

Niter Image

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Comments: Tan to white crystalline granular niter.
Location: Buffalo River Valley, Searcy County, Arkansas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Niter Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5907:1:0.7017
Help on Cell Dimensions: Cell Dimensions: a = 5.414, b = 9.164, c = 6.431, Z = 4; V = 319.07 Den(Calc)= 2.10
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.78(1), 3.73(0.56), 3.033(0.55),

Physical Properties of Niter

Help on Cleavage: Cleavage: {001} Very Good, {010} Good
Help on Color: Color: Colorless, White, Gray.
Help on Density: Density: 2.1 - 2.11, Average = 2.1
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Niter

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2122,KC= 0.2206
Ncalc = 1.46 - 1.47
Help on Optical Data: Optical Data: Biaxial (-), a=1.332, b=1.504, g=1.504, bire=0.1720, 2V(Calc)=0, 2V(Meas)=7. Dispersion weak, r < v.

Calculated Properties of Niter

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Niter =2.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PENiter = 4.07 barns/electron
U=PENiter x relectron= 8.44 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 551.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Niter per GRapi unit =1,811.89 (PPM)

Estimated Radioactivity from Niter - mild
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 9.69 cm 11,718 3.17E-07 551.91 0.18
100 gm / 4.50 cm 1,172 3.17E-08 55.19 0.02
10 gm / 2.09 cm 117 3.17E-09 5.52 0.00
1 gm / 9.69 mm 12 3.17E-10 0.55 0.00
0.1 gm / 4.50 mm 1 3.17E-11 0.06 0.00
0.01 gm / 2.09 mm 0 3.17E-12 0.01 0.00
0.001 gm / 0.97 mm 0 3.17E-13 0.00 0.00

Weight of pure Niter in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.10 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Niter Classification

Help on  Dana Class: Dana Class: (18)Simple Nitrates
  (18.01)where A xNO3 � x(H2O), x can equal zero
  (18.01.02)Niter Series Niter KNO3 Pmcn 2/m 2/m 2/m Gwihabaite! (NH4,K)(NO3) Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 05.NA.10 05 - CARBONATES (NITRATES)
  05.NA -Without OH or H2O
05.NA.10 Niter KNO3 Pmcn 2/m 2/m 2/m

Other Niter Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Niter :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 05.NA.10





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