Mineralogy Database

Sylvite Mineral Data

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General Sylvite Information

Help on Chemical  Formula: Chemical Formula: KCl
Help on Composition: Composition: Molecular Weight = 74.55 gm
   Potassium  52.45 %  K    63.18 % K2O
   Chlorine   47.55 %  Cl   47.55 % Cl
                -   %   Cl  -10.73 % -O=Cl2   
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KCl
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1832
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Dutch chemist, Sylvia de la Boe (1614-1672).
Help on Name Pronunciation: Name Pronunciation: Sylvite Say SYLVITE

Sylvite Image

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Comments: Translucent sylvite crystal cluster, somewhat deliquescent.
Location: F.O. Kailwerk, Sigmundshall, near Wunstorf, Niedersachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sylvite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 6.2931, Z = 4; V = 249.23 Den(Calc)= 1.99
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.15(1), 2.22(0.59), 1.82(0.23),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Sylvite

Help on Cleavage: Cleavage: {100} Perfect, {010} Perfect, {001} Perfect
Help on Color: Color: White, Yellowish white, Reddish white, Bluish white, Brownish white.
Help on Density: Density: 1.99
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Sylvite

Help on Optical Data: Optical Data: Isotropic, n=1.49.

Calculated Properties of Sylvite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.92 gm/cc
note: Specific Gravity of Sylvite =1.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000062934
Boson Index = 0.999937066
Help on Photoelectric: Photoelectric: PESylvite = 8.47 barns/electron
U=PESylvite x relectron= 16.28 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 730.82 (Gamma Ray American Petroleum Institute Units)
Concentration of Sylvite per GRapi unit =1,368.32 (PPM)

Estimated Radioactivity from Sylvite - mild
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 9.86 cm 15,891 4.29E-07 730.82 0.24
100 gm / 4.58 cm 1,589 4.29E-08 73.08 0.02
10 gm / 2.13 cm 159 4.29E-09 7.31 0.00
1 gm / 9.86 mm 16 4.29E-10 0.73 0.00
0.1 gm / 4.58 mm 2 4.29E-11 0.07 0.00
0.01 gm / 2.13 mm 0 4.29E-12 0.01 0.00
0.001 gm / 0.99 mm 0 4.29E-13 0.00 0.00

Weight of pure Sylvite in grams (gm) and Calculated Diameter of a Sphere with a Density of 1.99 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

Sylvite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.01)where A X
  (09.01.01)Halite Group Halite NaCl F m3m 4/m 3 2/m Sylvite KCl F m3m 4/m 3 2/m Villiaumite NaF F m3m 4/m 3 2/m Carobbiite KF F m3m 4/m 3 2/m Griceite LiF F m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 03.AA.20 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AA -M:X = 1:1, 2:3, 3:5, etc.
03.AA.20 Carobbiite KF F m3m 4/m 3 2/m
03.AA.20 Griceite LiF F m3m 4/m 3 2/m
03.AA.20 Halite NaCl F m3m 4/m 3 2/m
03.AA.20 Sylvite KCl F m3m 4/m 3 2/m
03.AA.20 Villiaumite NaF F m3m 4/m 3 2/m

Other Sylvite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Sylvite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 03.AA.20





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