Mineralogy Database

Mirabilite Mineral Data

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General Mirabilite Information

Help on Chemical  Formula: Chemical Formula: Na2SO4•10(H2O)
Help on Composition: Composition: Molecular Weight = 322.20 gm
   Sodium    14.27 %  Na   19.24 % Na2O
   Hydrogen   6.26 %  H    55.91 % H2O
   Sulfur     9.95 %  S    24.85 % SO3
   Oxygen    69.52 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2(SO4)•10(H2O)
Help on Environment: Environment: Saline mineral deposited from sodium sulfate-chloride brines. Very prominent in cold weather in such brines.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Vulcano Island, Messina Province, Sicily. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Latin, sal mirabile - "miracle salt" expressing Glauber's surprise on its synthesis.
Help on Name Pronunciation: Name Pronunciation: Mirabilite + Pronunciation Say MIRABILITE
Help on Synonym: Synonym: ICSD 30505
  PDF 11-647

Mirabilite Image

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Comments: Colorless grains and indistinct crystals of mirabilite. The mineral dehydrates quickly in dry air and must be preserved in a closed box.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Mirabilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2386:1:1.1091
Help on Cell Dimensions: Cell Dimensions: a = 12.82, b = 10.35, c = 11.48, Z = 4; beta = 107.66° V = 1,451.46 Den(Calc)= 1.47
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.49(1), 3.21(0.75), 3.26(0.6),
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 1) ( 0 1 0) ( 1 1 0) ( 0 2 1) ( 1 1 1) ( 1 0 0) ( 1 1 1) ( 0 0 1)

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Physical Properties of Mirabilite

Help on Cleavage: Cleavage: {100} Perfect, {001} Poor, {010} Poor
Help on Color: Color: Colorless, White, Yellowish white, Greenish white.
Help on Density: Density: 1.49
Help on Diaphaneity: Diaphaneity: Transparent to translucent to opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Mirabilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2778,KPDmeas= 0.2741,KC= 0.2706
Ncalc = 1.4
Help on Optical Data: Optical Data: Biaxial (-), a=1.396, b=1.4103, g=1.419, bire=0.0230, 2V(Calc)=74, 2V(Meas)=75.93. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): non.

Calculated Properties of Mirabilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.57 gm/cc
note: Specific Gravity of Mirabilite =1.49 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010895072
Boson Index = 0.9989104928
Help on Photoelectric: Photoelectric: PEMirabilite = 0.98 barns/electron
U=PEMirabilite x rElectron Density= 1.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mirabilite is Not Radioactive

Mirabilite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.02)where (A+)2 XO4 � x(H2O)
  (29.02.02)Dana Group Mirabilite Na2SO4•10(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 07.CD.10 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CD -With only large cations
07.CD.10 Mirabilite Na2SO4•10(H2O) P 21/a 2/m

Other Mirabilite Information

Help on References: References: NAME( AntBidBlaNic5) 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 Mirabilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 07.CD.10





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