Glauberite Mineral Data

Glauberite Mineral Data +

General Glauberite Information

Chemical Formula:

Na2Ca(SO4)2

Composition:

Molecular Weight = 278.18 gm

Sodium 16.53 % Na 22.28 % Na₂O

Calcium 14.41 % Ca 20.16 % CaO

Sulfur 23.05 % S 57.56 % SO₃

Oxygen 46.01 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca(SO₄)₂

Environment:

Dry salt-lake beds in desert climates.

IMA Status:

Valid Species (Pre-IMA) 1808

Locality:

Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data.

Name Origin:

Named after Glauber's Salt, of alchemist origin.

Synonym:

Glauber's Salt

ICSD 26773

PDF 19-1187

Glauberite Image

Images:

Glauberite

Comments: Translucent crystals of glauberite.
Location: Superior, Pinal County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Glauberite Hydroglauberite

Comments: Putty-colored chalky hydroglauberite on glauberite crystals.
Location: Camp Verde, Yavapai County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glauberite Crystallography

Axial Ratios:

a:b:c =1.2194:1:1.0273

Cell Dimensions:

a = 10.129, b = 8.306, c = 8.533, Z = 4; beta = 112.183° V = 664.76 Den(Calc)= 2.78

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.13(1), 2.66(0.8), 6.22(0.8),

Forms:

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Forms: [ 1 1 1] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Araki T , Zoltai T , American Mineralogist , 52 (1967) p.1272-1277, Refinement of the crystal structure of a glauberite

Physical Properties of Glauberite

Cleavage:

[001] Perfect

Color:

Colorless, Gray, Gray white, Yellow, Yellowish white.

Density:

2.7 - 2.85, Average = 2.77

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Glauberite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1888,KPDmeas= 0.1891,KC= 0.1865

Optical Data:

Biaxial (-), a=1.507-1.515, b=1.527-1.535, g=1.529-1.536, bire=0.0210-0.0220, 2V(Calc)=24-34, 2V(Meas)=0-7. Dispersion strong, r > v.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Glauberite

Electron Density:

r_electron=2.76 gm/cc
note: r_Glauberite=2.78 gm/cc.

Fermion Index

Fermion Index = 0.00214
Boson Index = 0.99786

Photoelectric:

PE_Glauberite= 3.43 barns/electron
U=PE_Glauberite x r_electron= 9.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Glauberite is Not Radioactive

Glauberite Classification

Dana Class:

28.4.2.1 (28)Anhydrous Acid and Sulfates

(28.4)with miscellaneous formulae

(28.4.2)Dana Group

28.4.2.1 Glauberite Na2Ca(SO4)2 C 2/c 2/m

Strunz Class:

VI/A.08-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/A - Waterfree sulfates [SO4]2- without unfamiliar anions. cations of very big size

VI/A.08 - Aphthitalite - Anhydrite series

VI/A.08-10 Aphthitalite (K,Na)3Na(SO4)2 P 3m 3 2/m

VI/A.08-20 Kalistrontite K2Sr(SO4)2 R 3m 3 2/m

VI/A.08-30 Palmierite (K,Na)2Pb(SO4)2 R 3m 3 2/m

VI/A.08-40 Glauberite Na2Ca(SO4)2 C 2/c 2/m

VI/A.08-50 Anhydrite CaSO4 Amma 2/m 2/m 2/m

Other Glauberite Information

References:

NAME( Pough60) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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

Glauberite

Na2Ca(SO4)2
Dana No: 28.4.2.1 Strunz No: VI/A.08-40
Locality:

Notes: